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 Showing 601 - 800 of 1205 Journals sorted alphabetically International Journal of Quality Assurance in Engineering and Technology Education       (Followers: 3) International Journal of Quality Engineering and Technology       (Followers: 4) International Journal of Quantum Information       (Followers: 6) International Journal of Rapid Manufacturing       (Followers: 3) International Journal of Recent Contributions from Engineering, Science & IT International Journal of Reliability, Quality and Safety Engineering       (Followers: 14) International Journal of Renewable Energy Technology       (Followers: 8) International Journal of Robust and Nonlinear Control       (Followers: 10) International Journal of Science and Innovative Technology International Journal of Science Engineering and Advance Technology International Journal of Sediment Research       (Followers: 2) International Journal of Self-Propagating High-Temperature Synthesis International Journal of Service Science, Management, Engineering, and Technology       (Followers: 2) International Journal of Signal and Imaging Systems Engineering International Journal of Six Sigma and Competitive Advantage       (Followers: 4) International Journal of Social Robotics       (Followers: 3) International Journal of Software Engineering and Knowledge Engineering       (Followers: 6) International Journal of Space Science and Engineering       (Followers: 13) International Journal of Speech Technology       (Followers: 7) International Journal of Spray and Combustion Dynamics       (Followers: 15) International Journal of Student Project Reporting       (Followers: 4) International Journal of Surface Engineering and Interdisciplinary Materials Science       (Followers: 1) International Journal of Surface Science and Engineering       (Followers: 6) International Journal of Sustainable Engineering       (Followers: 4) International Journal of Sustainable Lighting International Journal of Sustainable 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and Science Iranian Journal of Optimization       (Followers: 2) Iranian Journal of Science and Technology, Transactions A : Science IRBM News Ironmaking & Steelmaking       (Followers: 4) ISA Transactions ISSS Journal of Micro and Smart Systems       (Followers: 3) IT Professional       (Followers: 24) Iteckne J-ENSITEC : Journal Of Engineering and Sustainable Technology       (Followers: 4) Johnson Matthey Technology Review Journal of Advanced College of Engineering and Management Journal of Advanced Joining Processes Journal of Advanced Manufacturing Systems       (Followers: 5) Journal of Aerodynamics       (Followers: 27) Journal of Aerosol Science       (Followers: 7) Journal of Aerospace Engineering       (Followers: 66) Journal of Alloys and Compounds       (Followers: 16) Journal of Analytical and Applied Pyrolysis       (Followers: 5) Journal of Analytical Science & Technology       (Followers: 4) Journal of Analytical Sciences, Methods and Instrumentation       (Followers: 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Journal of China Universities of Posts and Telecommunications Journal of Cleaner Production       (Followers: 27) Journal of Coastal and Riverine Flood Risk (JCRFR)       (Followers: 1) Journal of Cold Regions Engineering       (Followers: 3) Journal of Combinatorial Designs       (Followers: 4) Journal of Combustion       (Followers: 40) Journal of Computational and Nonlinear Dynamics       (Followers: 6) Journal of Computational and Theoretical Nanoscience Journal of Computational Biology       (Followers: 9) Journal of Computational Design and Engineering       (Followers: 1) Journal of Computational Electronics       (Followers: 5) Journal of Computational Multiphase Flows       (Followers: 1) Journal of Computing and Information Science in Engineering       (Followers: 1) Journal of Coupled Systems and Multiscale Dynamics Journal of Dairy Science       (Followers: 12) Journal of Delta Urbanism       (Followers: 2) Journal of Display Technology       (Followers: 3) Journal of 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Engineering       (Followers: 30) Journal of Fourier Analysis and Applications       (Followers: 3) Journal of Fuel Cell Science and Technology       (Followers: 2) Journal of Functional Analysis       (Followers: 3) Journal of Fundamental and Applied Sciences Journal of Geological Research       (Followers: 1) Journal of Geotechnical and Geoenvironmental Engineering       (Followers: 30) Journal of Geotechnical Engineering       (Followers: 4) Journal of Geovisualization and Spatial Analysis Journal of Global Optimization       (Followers: 6) Journal of Graduate School of Natural and Applied Sciences of Mehmet Akif Ersoy University Journal of Hazardous Materials Advances Journal of Healthcare Engineering       (Followers: 3) Journal of Heat Transfer       (Followers: 66) Journal of Humanitarian Engineering       (Followers: 1) Journal of Hydraulic Engineering       (Followers: 27) Journal of Hyperspectral Remote Sensing       (Followers: 23) Journal of Imaging       (Followers: 3) Journal of Industrial and Production Engineering       (Followers: 4) Journal of Industrial Engineering and Management       (Followers: 5) Journal of Industrial Safety Engineering       (Followers: 6) Journal of Inequalities and Applications Journal of Infrared, Millimeter and Terahertz Waves       (Followers: 3) Journal of Infrastructure Preservation and Resilience       (Followers: 1) Journal of Institute of Science and Technology Journal of Intelligent and Connected Vehicles       (Followers: 1) Journal of Intelligent Systems : Theory and Applications Journal of International Maritime Safety, Environmental Affairs, and Shipping       (Followers: 1) Journal of Iron and Steel Research International       (Followers: 7) Journal of Irrigation and Drainage Engineering       (Followers: 24) Journal of King Saud University - Engineering Sciences Journal of KONBiN       (Followers: 4) Journal of Liquid Chromatography & Related Technologies       (Followers: 7) Journal of Management in 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Similar Journals
 Journal of Engineering ThermophysicsJournal Prestige (SJR): 0.435 Citation Impact (citeScore): 1Number of Followers: 4      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1990-5432 - ISSN (Online) 1810-2328 Published by Springer-Verlag  [2469 journals]
• Erratum to: Influence of Air Velocity on Non-Isothermal Decay and
Combustion of Gas Hydrate

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

PubDate: 2022-03-01

• Influence of Incidence Angle on Compressor Cascade Performance at 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)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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