Subjects -> ENGINEERING (Total: 2688 journals)
    - CHEMICAL ENGINEERING (229 journals)
    - CIVIL ENGINEERING (237 journals)
    - ELECTRICAL ENGINEERING (176 journals)
    - ENGINEERING (1325 journals)
    - ENGINEERING MECHANICS AND MATERIALS (452 journals)
    - HYDRAULIC ENGINEERING (56 journals)
    - INDUSTRIAL ENGINEERING (98 journals)
    - MECHANICAL ENGINEERING (115 journals)

ENGINEERING (1325 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 601 - 800 of 1205 Journals sorted alphabetically
International Journal of Quality Assurance in Engineering and Technology Education     Full-text available via subscription   (Followers: 3)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 4)
International Journal of Quantum Information     Hybrid Journal   (Followers: 6)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 3)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (Followers: 14)
International Journal of Renewable Energy Technology     Hybrid Journal   (Followers: 8)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (Followers: 10)
International Journal of Science and Innovative Technology     Open Access  
International Journal of Science Engineering and Advance Technology     Open Access  
International Journal of Sediment Research     Full-text available via subscription   (Followers: 2)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal  
International Journal of Service Science, Management, Engineering, and Technology     Full-text available via subscription   (Followers: 2)
International Journal of Signal and Imaging Systems Engineering     Hybrid Journal  
International Journal of Six Sigma and Competitive Advantage     Hybrid Journal   (Followers: 4)
International Journal of Social Robotics     Hybrid Journal   (Followers: 3)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (Followers: 6)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 13)
International Journal of Speech Technology     Hybrid Journal   (Followers: 7)
International Journal of Spray and Combustion Dynamics     Full-text available via subscription   (Followers: 15)
International Journal of Student Project Reporting     Hybrid Journal   (Followers: 4)
International Journal of Surface Engineering and Interdisciplinary Materials Science     Full-text available via subscription   (Followers: 1)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 4)
International Journal of Sustainable Lighting     Open Access  
International Journal of Sustainable Manufacturing     Hybrid Journal   (Followers: 4)
International Journal of Systems and Service-Oriented Engineering     Full-text available via subscription  
International Journal of Systems Assurance Engineering and Management     Hybrid Journal  
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 6)
International Journal of Technoethics     Full-text available via subscription   (Followers: 2)
International Journal of Technology Management and Sustainable Development     Hybrid Journal   (Followers: 1)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 6)
International Journal of Telemedicine and Applications     Open Access   (Followers: 4)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 18)
International Journal of Thermodynamics     Open Access   (Followers: 15)
International Journal of Transportation Engineering     Open Access   (Followers: 2)
International Journal of Turbomachinery, Propulsion and Power     Open Access   (Followers: 23)
International Journal of Ultra Wideband Communications and Systems     Hybrid Journal  
International Journal of Vehicle Autonomous Systems     Hybrid Journal  
International Journal of Vehicle Design     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Information and Communication Systems     Hybrid Journal   (Followers: 1)
International Journal of Vehicle Noise and Vibration     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Safety     Hybrid Journal   (Followers: 3)
International Journal of Virtual Technology and Multimedia     Hybrid Journal   (Followers: 2)
International Journal of Wavelets, Multiresolution and Information Processing     Hybrid Journal  
International Journal on Artificial Intelligence Tools     Hybrid Journal   (Followers: 9)
International Journal on Smart Sensing and Intelligent Systems     Open Access  
International Nano Letters     Open Access   (Followers: 6)
International Review of Applied Sciences and Engineering     Full-text available via subscription  
International Scholarly Research Notices     Open Access   (Followers: 122)
International Scientific and Vocational Studies Journal     Open Access  
International Scientific Journal of Engineering and Technology (ISJET)     Open Access  
Inventions     Open Access  
Inventum     Open Access  
Inverse Problems in Science and Engineering     Hybrid Journal   (Followers: 3)
Investiga : TEC     Open Access  
Ionics     Hybrid Journal   (Followers: 2)
IPTEK The Journal for Technology and Science     Open Access  
Iranian Journal of Optimization     Open Access   (Followers: 2)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
IRBM News     Full-text available via subscription  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
ISA Transactions     Full-text available via subscription  
ISSS Journal of Micro and Smart Systems     Hybrid Journal   (Followers: 3)
IT Professional     Full-text available via subscription   (Followers: 24)
Iteckne     Open Access  
J-ENSITEC : Journal Of Engineering and Sustainable Technology     Open Access   (Followers: 4)
Johnson Matthey Technology Review     Open Access  
Journal of Advanced College of Engineering and Management     Open Access  
Journal of Advanced Joining Processes     Open Access  
Journal of Advanced Manufacturing Systems     Hybrid Journal   (Followers: 5)
Journal of Aerodynamics     Open Access   (Followers: 27)
Journal of Aerosol Science     Hybrid Journal   (Followers: 7)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 66)
Journal of Alloys and Compounds     Hybrid Journal   (Followers: 16)
Journal of Analytical and Applied Pyrolysis     Hybrid Journal   (Followers: 5)
Journal of Analytical Science & Technology     Open Access   (Followers: 4)
Journal of Analytical Sciences, Methods and Instrumentation     Open Access   (Followers: 4)
Journal of Applied Engineering Sciences     Open Access  
Journal of Applied Physics     Hybrid Journal   (Followers: 69)
Journal of Applied Research and Technology     Open Access  
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences     Open Access   (Followers: 4)
Journal of Architectural and Engineering Research     Open Access   (Followers: 3)
Journal of Architectural Engineering     Full-text available via subscription   (Followers: 4)
Journal of Automation and Control     Open Access   (Followers: 9)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 10)
Journal of Biological Dynamics     Open Access   (Followers: 1)
Journal of Biomedical Science     Open Access   (Followers: 4)
Journal of Biomolecular NMR     Hybrid Journal   (Followers: 6)
Journal of Biosciences     Open Access   (Followers: 1)
Journal of Building Pathology and Rehabilitation     Hybrid Journal  
Journal of Catalysis     Hybrid Journal   (Followers: 11)
Journal of Catalyst & Catalysis     Full-text available via subscription   (Followers: 2)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Chemical and Petroleum Engineering     Open Access   (Followers: 1)
Journal of China Coal Society     Open Access  
Journal of China Universities of Posts and Telecommunications     Full-text available via subscription  
Journal of Cleaner Production     Hybrid Journal   (Followers: 27)
Journal of Coastal and Riverine Flood Risk (JCRFR)     Open Access   (Followers: 1)
Journal of Cold Regions Engineering     Full-text available via subscription   (Followers: 3)
Journal of Combinatorial Designs     Hybrid Journal   (Followers: 4)
Journal of Combustion     Open Access   (Followers: 40)
Journal of Computational and Nonlinear Dynamics     Full-text available via subscription   (Followers: 6)
Journal of Computational and Theoretical Nanoscience     Full-text available via subscription  
Journal of Computational Biology     Hybrid Journal   (Followers: 9)
Journal of Computational Design and Engineering     Open Access   (Followers: 1)
Journal of Computational Electronics     Hybrid Journal   (Followers: 5)
Journal of Computational Multiphase Flows     Open Access   (Followers: 1)
Journal of Computing and Information Science in Engineering     Full-text available via subscription   (Followers: 1)
Journal of Coupled Systems and Multiscale Dynamics     Full-text available via subscription  
Journal of Dairy Science     Open Access   (Followers: 12)
Journal of Delta Urbanism     Open Access   (Followers: 2)
Journal of Display Technology     Hybrid Journal   (Followers: 3)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 14)
Journal of Dynamical and Control Systems     Hybrid Journal   (Followers: 7)
Journal of Earthquake Engineering     Hybrid Journal   (Followers: 14)
Journal of Elasticity     Hybrid Journal   (Followers: 7)
Journal of Electroceramics     Hybrid Journal  
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 10)
Journal of Electronic Testing     Hybrid Journal   (Followers: 2)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 9)
Journal of Electrostatics     Hybrid Journal   (Followers: 2)
Journal of Energy Engineering     Full-text available via subscription   (Followers: 7)
Journal of Energy Resources Technology     Full-text available via subscription   (Followers: 4)
Journal of Engineering     Open Access  
Journal of Engineering     Open Access   (Followers: 1)
Journal of Engineering and Applied Science     Open Access  
Journal of Engineering and Technological Sciences     Open Access   (Followers: 2)
Journal of Engineering Design     Hybrid Journal   (Followers: 17)
Journal of Engineering Education     Hybrid Journal   (Followers: 7)
Journal of Engineering for Gas Turbines and Power     Full-text available via subscription   (Followers: 15)
Journal of Engineering Mathematics     Hybrid Journal   (Followers: 2)
Journal of Engineering Mechanics     Full-text available via subscription   (Followers: 16)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 2)
Journal of Engineering Research     Open Access   (Followers: 1)
Journal of Engineering Research and Reports     Open Access  
Journal of Engineering Technology and Applied Sciences     Open Access  
Journal of Engineering Thermophysics     Hybrid Journal   (Followers: 4)
Journal of Engineering, Design and Technology     Hybrid Journal   (Followers: 17)
Journal of Engineering, Project, and Production Management     Open Access  
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 2)
Journal of Environmental Engineering     Full-text available via subscription   (Followers: 49)
Journal of Environmental Engineering and Landscape Management     Open Access   (Followers: 8)
Journal of Environmental Engineering and Science     Hybrid Journal   (Followers: 2)
Journal of Experimental Nanoscience     Hybrid Journal  
Journal of Fire Sciences     Hybrid Journal   (Followers: 6)
Journal of Flood Risk Management     Hybrid Journal   (Followers: 14)
Journal of Flow Control, Measurement & Visualization     Open Access   (Followers: 1)
Journal of Fluids Engineering     Full-text available via subscription   (Followers: 30)
Journal of Fourier Analysis and Applications     Hybrid Journal   (Followers: 3)
Journal of Fuel Cell Science and Technology     Full-text available via subscription   (Followers: 2)
Journal of Functional Analysis     Full-text available via subscription   (Followers: 3)
Journal of Fundamental and Applied Sciences     Open Access  
Journal of Geological Research     Open Access   (Followers: 1)
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical Engineering     Full-text available via subscription   (Followers: 4)
Journal of Geovisualization and Spatial Analysis     Hybrid Journal  
Journal of Global Optimization     Hybrid Journal   (Followers: 6)
Journal of Graduate School of Natural and Applied Sciences of Mehmet Akif Ersoy University     Open Access  
Journal of Hazardous Materials Advances     Open Access  
Journal of Healthcare Engineering     Open Access   (Followers: 3)
Journal of Heat Transfer     Full-text available via subscription   (Followers: 66)
Journal of Humanitarian Engineering     Open Access   (Followers: 1)
Journal of Hydraulic Engineering     Full-text available via subscription   (Followers: 27)
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 23)
Journal of Imaging     Open Access   (Followers: 3)
Journal of Industrial and Production Engineering     Hybrid Journal   (Followers: 4)
Journal of Industrial Engineering and Management     Open Access   (Followers: 5)
Journal of Industrial Safety Engineering     Full-text available via subscription   (Followers: 6)
Journal of Inequalities and Applications     Open Access  
Journal of Infrared, Millimeter and Terahertz Waves     Hybrid Journal   (Followers: 3)
Journal of Infrastructure Preservation and Resilience     Open Access   (Followers: 1)
Journal of Institute of Science and Technology     Open Access  
Journal of Intelligent and Connected Vehicles     Open Access   (Followers: 1)
Journal of Intelligent Systems : Theory and Applications     Open Access  
Journal of International Maritime Safety, Environmental Affairs, and Shipping     Open Access   (Followers: 1)
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 7)
Journal of Irrigation and Drainage Engineering     Full-text available via subscription   (Followers: 24)
Journal of King Saud University - Engineering Sciences     Open Access  
Journal of KONBiN     Open Access   (Followers: 4)
Journal of Liquid Chromatography & Related Technologies     Hybrid Journal   (Followers: 7)
Journal of Management in Engineering     Full-text available via subscription   (Followers: 9)
Journal of Manufacturing Science and Engineering     Full-text available via subscription   (Followers: 32)
Journal of Manufacturing Systems     Full-text available via subscription   (Followers: 3)
Journal of Manufacturing Technology Management     Hybrid Journal   (Followers: 3)
Journal of Mechanical Design and Testing     Open Access   (Followers: 4)
Journal of Mechatronics     Full-text available via subscription   (Followers: 3)
Journal of Mega Infrastructure & Sustainable Development     Hybrid Journal  
Journal of Metallurgy     Open Access   (Followers: 8)
Journal of Mining Institute     Open Access  
Journal of Motor Behavior     Hybrid Journal   (Followers: 8)
Journal of Multivariate Analysis     Hybrid Journal   (Followers: 15)
Journal of Nanoengineering and Nanomanufacturing     Full-text available via subscription  
Journal of Nanoparticle Research     Hybrid Journal   (Followers: 3)
Journal of Nanoscience     Open Access  
Journal of Nanoscience and Nanotechnology     Full-text available via subscription   (Followers: 8)
Journal of NanoScience, NanoEngineering & Applications     Full-text available via subscription  
Journal of Nanotechnology     Open Access   (Followers: 10)
Journal of Nanotechnology in Engineering and Medicine     Full-text available via subscription   (Followers: 4)

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Similar Journals
Journal Cover
Journal of Engineering Thermophysics
Journal Prestige (SJR): 0.435
Citation Impact (citeScore): 1
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1990-5432 - ISSN (Online) 1810-2328
Published by Springer-Verlag Homepage  [2469 journals]
  • Erratum to: Influence of Air Velocity on Non-Isothermal Decay and
           Combustion of Gas Hydrate

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      Abstract: An Erratum to this paper has been published: https://doi.org/10.1134/S1810232822010155
      PubDate: 2022-03-01
       
  • Mathematical Modeling of CO2 and SO2 Adsorption in a Packed
           Column from Flue Gases of TPS

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      Abstract: A physico-mathematical model of gas adsorption in a packed column (PC) has been built. Analysis of the results of some experimental studies has shown that in most practical cases of extraction of target components from the vapor-gas flow at the interface (on the surface of the adsorbent granules), Henry’s phase equivalence can be approximated with a linear law. Calculations have been performed for the experiment isotherm of nitrogen adsorption onto aluminosilicate in the region of its linear part at low concentrations of the adsorbate in the adsorbent; Henry’s constants for CO2 at adsorption onto aluminosilicate have been found for three temperatures (30, 55, and 75°C) in accordance with the known experimental data. A parametric analysis has been performed with respect to the CO2 adsorption process in a PC against the packed bed height, size of adsorbent granules, and rate of filtration of the vapor-gas flow through the packed bed. Estimations have been made for SO2 adsorption onto aluminosilicate in a PC; some practical recommendations have been given for using the results presented in the article, as well as on the need to continue systematic comprehensive theoretical and experimental study of the adsorption process in a PC to establish the dependence of the phase equilibrium constants on the temperature and concentration of water vapor in gases for certain target gas component-adsorbent pairs.
      PubDate: 2022-03-01
       
  • Influence of Incidence Angle on Compressor Cascade Performance at Low
           Reynolds Number

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      Abstract: When an UAV is sailing at high altitude, the Reynolds number is low due to the low inlet density and dynamic viscosity. The influence of the low Reynolds number on the axial compressor results in increase in the load on the blade and the flow separation on the compressor blade cascade, which worsens the compressor performance. For study of the influence of the low Reynolds number on the compressor flow mechanism at the different incidence angles, the high subsonic compressor blade cascade V103 is selected as the research object. The numerical simulation method is used for analysis of the change in the boundary layer loss and boundary layer transition and separation on the cascade suction side at different Reynolds numbers (Re = 1.5 × 105, 4.5 × 105, and 1.2 × 106), the inlet incidence angle varying from −8° to 10°. The numerical simulation results reveal the relationship between the size of the separation bubble on the boundary layer and the flow transition point. The blade profile losses at different incidence angles and Reynolds numbers are displayed. It can be found that there exists an incidence angle corresponding to the lowest blade profile loss, and such incidence decreases when the Reynolds number increases. The current research work can provide a theoretical basis for a compressor blade loss model and blade optimization at a low Reynolds number.
      PubDate: 2022-03-01
       
  • Heat Transfer Enhancement during Pool Boiling of Nitrogen on Porous
           Coatings Produced by Selective Laser Melting/Sintering (SLM/SLS)

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      Abstract: A study of the heat transfer, critical heat fluxes, and dynamics of vapor formation during boiling of liquid nitrogen at pressures of 0.1 and 0.018 MPa under conditions of stationary heat release has been carried out. A smooth copper plate and plates with capillary-porous coatings with various structural parameters, produced by additive 3D printing (Selective Laser Melting/Sintering), were used as test sections. The presence of the coatings has been shown to lead to substantial enhancement of heat transfer in comparison with the smooth section. High-speed video recording of boiling was carried out, on the basis of which experimental data on the bubble departure diameters were obtained, and qualitative assessment of the density of active nucleation sites for the investigated types of heaters was carried out.
      PubDate: 2022-03-01
       
  • Experimental and Numerical Investigation of Flow Structures Around
           Different Binary Building Geometries

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      Abstract: The separation zones resulting from the wind interaction with a building and its immediate surroundings are of great importance for determination of multiple vortex systems interacting with the building and for consideration of appropriate design parameters. In this study, flow structures around building models having dimensions of 5 × 5 × 5 cm (Model B), 5 × 5 × 10 cm (Model C), and 5 × 10 × 5 cm (Model D) with a 30° slope and rooftop were examined experimentally with a distance of 13.75 cm between two models (Model B and C; Model C and D) with the use of Particle Image Velocimetry (PIV). Besides, the experimental work of placing binary building was numerically researched with the use of ANSYS Fluent 16.0 software program with the k- \(\varepsilon\) turbulence model for a three-dimensional steady state, and the obtained numerical results were compared with the experimental results. Instantaneous velocity fields were firstly obtained in the experiments, and then the streamlines <  \(\Psi\)  >, velocity distributions < V >, and vortex peer curves <  \(\omega\)  > were plotted based on these data. The average equivalent velocity curve distributions in the x and y directions were also investigated for both pairs of building models. The results showed that the vortex lengths on the back of Model C increased by 13.33% as compared with Model B. The obtained result demonstrated that the geometric features had an effect on the formation of vortex separation zones. Comparison of the experimental and numerical results gave a deviation of maximum 3%.
      PubDate: 2022-03-01
       
  • Modified Homogeneous and Heterogeneous Chemical Reaction and Flow
           Performance of Maxwell Nanofluid with Cattaneo–Christov Heat Flux Law

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      Abstract: An MHD boundary layer flow of upper-convected Maxwell (UCM) nanofluid over an extending surface has been studied in the current literature. The most recent double diffusive heat flux model proposed by Cattaneo and modified by Christov has been incorporated into the energy equation instead of the conventional Fourier model in the governing equation of the flow. Homogeneous and heterogeneous chemical reaction is incorporated in the fluid system with heat generation due to the homogeneous chemical reaction and chemical reaction dependent thermal intake capacity of nanoparticles. After an arduous numerical calculation, the impact of numerous germane factors on the heat and mass relocation characteristics of flow has been illustrated through charts and graphs, and the consequences have been explained with proper reasoning. In every graph and table, we compare the outcomes for the conventional Fourier law and the Cattaneo–Christov law. To measure the relation of the flow regulator factor with the flow performance, we introduce correlation coefficients and coefficients of determination and present them with proper charts. It is observed that the correlation is high.
      PubDate: 2022-03-01
       
  • Enhancement of Phenol Oxidation in Supercritical Water-Oxygen Fluid with
           Addition of Methane

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      Abstract: The paper presents the results of a study of co-oxidation of phenol and methane in a supercritical water-oxygen fluid at a pressure of 25 MPa, starting temperature of 773 K, and variation in the flow rate of the phenol solution (3–7 g/min), oxygen (1.66–3.33 g/min), and methane (0.18–0.54 g/min). The experiments were carried out with the use of a vertically arranged tubular reactor in two modes: mixing of CH4 and O2 in counter jets in an ascending co-current flow of the phenol solution, as well as mixing of CH4 and O2 streams and the phenol solution at the lower part of the reactor. Data on the composition of the oxidation products and time dependences of the temperature of thermocouples and the power of ohmic heaters have been obtained. It has been shown that in both oxidation modes, the addition of methane leads to a significant (by several orders of magnitude) decrease in the content of phenols in the water collected at the outlet of the reactor. Due to the lower residual content of phenol in the water at mixing of the streams of the reagents in the lower part of the reactor, this method can be considered as more effective in comparison with oxidation in counter jets of CH4 and O2.
      PubDate: 2022-03-01
       
  • Numerical Investigation of Corrugated Channel with Backward-Facing Step in
           Terms of Fluid Flow and Heat Transfer

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      Abstract: In this study, the turbulent fluid flow and heat transfer through a backward-facing step connected by various triangles to a corrugated wall were numerically investigated. The governing equation was solved with Ansys Fluent, a CFD (Computational Fluid Dynamic) application that provides solutions using the Finite Volume Method (FVM). The working channel was considered with the step length H and an expansion ratio of 2. While the main channel geometry has a straight bottom surface, the compared channel geometry has a triangular bottom surface with various step lengths (p = 5 mm, p = 10 mm, and p = 15 mm) at a constant amplitude height (5 mm), and a heat flux of 4 kW/m2 was applied to this surface. The Reynolds number Re was studied in the range of 5000 to 20000. The Performance Evaluation Criterion (PEC) values, which are a function of the Nusselt number Nu and the skin friction, are calculated. As a result, while all the surfaces increase the heat transfer, the highest PEC values are obtained at Re = 5 × 103 and Re = 104 in the channel with the 10 mm triangular bottom surface and at Re = 1.5 × 104 and Re = 2 × 104 in the channel with the 20 mm triangular bottom surface.
      PubDate: 2022-03-01
       
  • A Study of Solids Mixing in a Bubbling Fluidized Bed Using the TFM Method.
           Part I. Particle Travel Time Distribution

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      Abstract: The fluidized bed has been widely applied in different industrial processes because of its inherent advantages like excellent heat and mass transfer and mixing. In the Fluid CokingTM process, wet agglomerates carry the unreacted liquid to the stripper, which causes fouling and decreases the efficiency. The cumulative distribution of the formation-to-stripper time for wet agglomerates or particles is a very vital factor in the performance of fluidized bed reactor. A novel method based on the Eulerian-Eulerian approach was applied in the bubbling fluidized bed to track the particle travel time. In addition, the effects of design parameters (gas distributors and baffles) and operating conditions (superficial gas velocity) on the particle travel time in a bubbling fluidized bed were investigated. The results show that the particle travel time can be increased by either a baffle with a fluxtube or a modified gas distributor.
      PubDate: 2022-03-01
       
  • Experimental Study on the Performance of a Solar Heat Pump System

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      Abstract: A solar heat pump system was designed and built. In this paper, the operation performance of the system was investigated experimentally. The effects of significant parameters such as the water temperature at the inlet and outlet of the evaporator, collector, and condenser and the solar radiation intensity were considered. When the water temperature at the condenser inlet was set at different values, the water temperature at the evaporator inlet was found to be proportional to the suction pressure and discharge pressure of the compressor and inversely proportional to the compression ratio. At different water temperatures at the evaporator inlet, the influence of the water temperature at the condenser outlet on the suction pressure was not obvious; however, the maximum change in the suction pressure was 0.9MPa. The power consumption of the compressor was hardly affected. Lower water temperature at the collector inlet contributes to improvement of its heat collection efficiency, and various factors should be considered in the design of the collector. The higher was the water temperature at the evaporator inlet and the lower was the water temperature at the condenser outlet, the larger was the found coefficient of performance ( COP) of the heat pump unit COP \(_{hp}\)  , as well as the found COP of system COP \(_{sys}\) . In addition, as the solar radiation intensity grew, the heating capacity and COP \(_{sys}\)  increased continuously, the maximum variation in COP \(_{sys}\)  being 0.4. It is hoped that this research will offer valuable insights for designing advanced solar heat pump (SHP) systems.
      PubDate: 2022-03-01
       
  • Temperature Dependence of Thermal Conductivity for Water Using the
           Transient Hot-Wire Method

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      Abstract: Temperature dependence of the thermal conductivity of liquid water is important in several engineering applications. This study reports experimental measurements of the thermal conductivity of water as a function of temperature. The transient hot-wire method is used for measurement of the thermal conductivity over the temperature range of 273–305 K at atmospheric pressure conditions. The experiments are carried out for a fixed current of 250 mA, and the resulting temperature rise for a platinum wire 9.53 cm long with a radius of 25  \(\mu\) m yields the thermal conductivity by means of the solution to the heat conduction equation for a continuous line source in an infinite medium. It is found that using the temperature-dependent coefficient of resistance of platinum wire is crucial in obtaining the correct variation of the thermal conductivity with temperature. A data reduction procedure is suggested for improvement of the accuracy of the reported values via identification of the onset of convection in the fluid. The specific contributions of this work include the extension of experimental results to lower temperatures in the vicinity of the freezing point of water. This study also provides systematic comparison of experimental and computational results, which helps understand the fluid flow and heat transfer characteristics in the vicinity of a line source embedded in an infinite fluid medium.
      PubDate: 2022-03-01
       
  • Heat Conduction of Superheated Mixtures: Relationship with Excess Volume

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      Abstract: The article elucidates the characteristic features of heat transfer from a fast-response heater probe to a pulse-heated liquid solution in the heat conduction mode. The heating time was 10 ms; the heat flux density increase was up to 10 MW/m2 by order of magnitude. The experiments confirmed the conclusion by L.P. Filippov on the appearance of additional (with respect to the additive values) thermal resistance of liquid with the addition of a second component to it. The verification of the conclusion based on a new material relying on the substantial expansion of the range of variation of the excess volume and temperature, including in not fully stable states, briefly superheated relative to the temperature of liquid-vapor and/or liquid-liquid equilibrium. The results indirectly indicate the excess volume at the initial temperature of the solution as a key factor determining the value of its additional thermal resistance in the superheated state.
      PubDate: 2022-03-01
       
  • A Numerical Model and Analysis of Microscale Explosive Initiator
           Integrated with Thin-Film Reactive Bridge of Nanoscale Aluminum/Nickel
           Multilayers

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      Abstract: A reactive bridge of nanoscale Al/Ni multilayers, or nanolaminates, is a recent advance in microscale thin-film initiator systems, potentially improving performances of explosive initiator. This numerical study introduces a three-dimensional (3D) modeling of initiator with a reactive bridge for more realistic and accurate system prediction as compared with the existing one-dimensional (1D) approximation of thin-film initiator. The model gives transient simulations for the atomic species and thermal diffusion, as well as prediction of electric potential distribution and pulsed energy deposition in the platinum bridge film. The computational results show that 3D effects are substantial such locally concentrated bridge joule heating and reduced reaction sensitivity in bimetallic multilayers by lateral heat loss. The horizontal reaction wave propagation from corners of the nanolaminates is also examined, as it effectively invalidates the 1D model of uniform bridge heating and vertical reaction advances across bimetallic multilayers. Optimization of various system design parameters is also discussed in view of achievement of best initiator performances.
      PubDate: 2022-03-01
       
  • A Study of the Solids Mixing in a Bubbling Fluidized Bed Using the TFM
           Method. Part II. Solids Dispersion Coefficient

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      Abstract: Solids mixing plays an essential role in industrial processes. In this study, solids mixing in the bubbling fluidized bed were investigated numerically by the Eulerian-Eulerian method. The solids mixing behaviour in the bubbling fluidized bed was studied via comparison of the dispersion coefficient of particles (the mixing index). The study mainly compared the effects of design parameters (gas distributor and baffles) and operating conditions (superficial gas velocity) on the solids mixing in the bubbling fluidized bed. A baffle can improve the vertical dispersion coefficient in the upper section, while the inlet gas distributor configuration more affects the lower section. Combining both a baffle and a gas distributor does show noticeable improvement in the solids mixing.
      PubDate: 2022-03-01
       
  • Experimental Study of Thermal Conductivity and Viscosity of Water-Based
           MWCNT-Y2O3 Hybrid Nanofluid with Surfactant

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      Abstract: There is an overwhelming demand in many solar applications to evaluate and improve the thermal properties (dynamic viscosity and thermal conductivity) of working fluids to ensure that those fluids are the most efficient. This can be achieved via scattering of tiny solid (mono or hybrid) nanomaterials into conventional fluids. In this experimental study, the thermal properties of a distilled water-based MWCNT+Y2O3 combination with a 20:80 weight ratio were experimentally investigated. The proposed hybrid nanofluid, prepared by a two-step method, with Gum Arabic as a surfactant, had half total volume concentrations of (0.01–0.2% vol) in the temperature range of 20–60°C, where stability has been reached and checked with various technics. The results demonstrate that the thermal conductivity coefficient increases with both temperature and concentration, especially at high concentrations and high temperatures. The maximum enhancement observed reaches 13% at a volume concentration of 0.2% and temperature of 60°C. As for the viscosity, the relative viscosity was obtained for various temperatures and concentrations, the maximum results reaching 8.85 at a concentration equal to 0.2%. Finally, correlations for the hybrid nanofluid thermal conductivity ratio and relative viscosity were suggested under the mentioned limitations, and the calculated experimental results demonstrate good accuracy with the proposed correlations with R2 = 0.99 for the thermal conductivity ratio and R2 = 0.95 for the relative viscosity.
      PubDate: 2022-03-01
       
  • Modeling of Freon 134a Gas Hydrate Synthesis via Boiling and Condensation
           of Gas in a Volume of Water

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      Abstract: The paper presents a theoretical assessment of the hydration mass increase with time in the gas hydrate synthesis based on the self-organizing cyclic process of boiling and condensation of the hydrate-forming gas in a volume of water. Data were obtained on the distribution of the bubbles released because of boiling of the liquefied gas at three different points in time in a real experiment. The average rate of increase in the hydration mass was determined. The hydration gain was simulated for an experiment 30 minutes long. The data obtained were compared with experimental results.
      PubDate: 2021-10-01
      DOI: 10.1134/S1810232821040123
       
  • Wall Shear Stress Distribution in an Annular Channel with a Stationary Gas
           Bubble

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      Abstract: The flow around a stationary gas bubble in an annular channel was studied. The channel had a diameter of the outer and inner tubes of 32 and 10 mm, respectively. The liquid flow was downward. The stationary bubble was produced by injection of air through a capillary tube. The wall shear stress measurements were performed by the electrodiffusional technique. The measured circumferential distributions of the wall shear stress demonstrated strong nonuniformity across the channel. The highest liquid velocity was in the region of the bridge flowing around the bubble.
      PubDate: 2021-10-01
      DOI: 10.1134/S181023282104007X
       
  • Study of Enhancement of Synthesis of Freon 134a Gas Hydrate During Boiling
           of Liquefied Gas with Its Simultaneous Stirring with Water

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      Abstract: The paper presents an analysis of the dependence on gas hydrate synthesis on the initial mass of hydrate-forming gas in a method based on explosive boiling of liquefied hydrate-forming gas in a volume of water. An experimental study for two cases is presented: with and without stirring of the working area during decompression. Freon 134a was used as a hydrate-forming gas.
      PubDate: 2021-10-01
      DOI: 10.1134/S1810232821040135
       
  • Analysis of Heat and Mass Transfer Characteristics of Distillation Column
           with Structured Packings with Different Geometrical Parameters

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      Abstract: The heights of transfer units, the heights of equivalent theoretical trays, and the pressure drops have been measured experimentally for structured packings 1, 2, and 3 with different geometrical parameters, all other things being equal. The experiments were carried out on a distillation column, a mixture of R114/R21 freons used as the working fluid. In terms of physical properties, freons are very close to cryogenic liquids (except for the density), which can significantly simplify the research task and enable getting necessary information. The mentioned packings differ significantly in their geometrical characteristics and, therefore, each of them can be optimal for mixtures with different physical properties. The objective of the research was to get the heat and mass transfer characteristics and pressure drops for different types of packings.
      PubDate: 2021-10-01
      DOI: 10.1134/S1810232821040032
       
  • Ultrasonic Measurements of Two-Phase Flow

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      Abstract: The paper presents development of a complex method of ultrasonic measurement of two-phase flows. The method enables measurement of the dynamic and structural characteristics of ascending inhomogeneity. A software and hardware complex for realization of the proposed method has been developed and implemented and tested in water. Results of experimental studies show that the software and hardware complex enables detection of rising gas bubbles in a liquid medium, monitoring of their dynamics, and localization of them in a volume of 5 to 50 cm3.
      PubDate: 2021-10-01
      DOI: 10.1134/S1810232821040111
       
 
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