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Results in Engineering
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2590-1230
Published by Elsevier Homepage  [3184 journals]
  • Improved Dielectric Properties of Microwave Irradiated Sol-Gel Derived
           SiO2-TiO2 Thin Film

    • Abstract: Publication date: Available online 12 September 2019Source: Results in EngineeringAuthor(s): Krishna MunishamaiahAbstractThe objective of the present investigation was to investigate the effect of conventional annealing and microwave irradiation on the structural, optical and dielectric properties of SiO2-TiO2 thin film developed by sol gel technique. SiO2-TiO2 thin film prepared using spin coater with optimized conditions, then heat treated by conventional annealing and microwave irradiation. The phase, morphology, topography, film thickness and optical properties were measured by X-ray diffraction, scanning electron microscopy, atomic force microscopy, profile-meters and UV-VS-NIR spectrophotometer respectively. The results show the dielectric constants of the microwave exposed films were superior to those of conventional annealed films. Microwave exposed films exhibited low leakage current densities and high resistivity. The microwave irradiation improves SiO2-TiO2 thin film with higher dielectric constant and lower leakage current density.
       
  • Topological variations in the optimal vortex due to the interaction of two
           concentric synthetic jets

    • Abstract: Publication date: Available online 6 September 2019Source: Results in EngineeringAuthor(s): Inés Palomo, José M. Pérez, Soledad Le ClaincheAbstractSynthetic jets are devices that periodically generate a vortex producing thrust, which is similar to the vortex driving the swimming motion of some marine animals (i.e.: jellyfish, squids, …). The optimal working conditions of these devices lead to the artificial generation of a vortex that maximizes thrust and efficiency, known as the optimal vortex. This article shows the topological variations of the optimal vortex produced by the periodic interaction of an external concentric jet over the jet main stream. For such aim, numerical simulations have been carried out at three different working conditions, generating three types of vortices, representing the artificial generation of (i) vortices producing small quantity of thrust but requiring low energetic supplies (sub-critical conditions), (ii) vortices producing large quantity of thrust but requiring high energetic supplies (super-critical conditions) and (iii) the optimal vortex producing maximum thrust using minimal energetic supplies. Topological variations will determine the effect produced by the interaction of the external concentric jet with the three types of vortices described above.
       
  • Improving engineering models of terramechanics for planetary exploration

    • Abstract: Publication date: September 2019Source: Results in Engineering, Volume 3Author(s): A.J.R. Lopez-Arreguin, S. MontenegroAbstractThis short letter proposes more consolidated explicit solutions for the forces and torques acting on typical rover wheels, that can be used as a method to determine their average mobility characteristics in planetary soils. The closed loop solutions stand in one of the verified methods, but at difference of the previous, observables are decoupled requiring a less amount of physical parameters to measure. As a result, we show that with knowledge of terrain properties, wheel driving performance rely in a single observable only. Because of their generality, the formulated equations established here can have further implications in autonomy and control of rovers or planetary soil characterization.
       
  • ENERGY X.0: Future of energy systems

    • Abstract: Publication date: September 2019Source: Results in Engineering, Volume 3Author(s): Ahmad KarnamaAbstractClimate change is an existential threat for human-beings and energy sector is the prime responsible. On the other hand, the technological progress has made it possible to use sustainable resource for energy generation and consume energy more intelligently. The latest has made the large industries to be willing to take control over their own energy system. EX.0 (ENERGY X.0) encapsulates the visions for a change in the energy systems considering the technological progress and the need for a revolution to save our planet.
       
  • Influence of pulverized palm kernel and egg shell additives on the
           hardness, coefficient of friction and microstructure of grey cast iron
           material for advance applications

    • Abstract: Publication date: September 2019Source: Results in Engineering, Volume 3Author(s): Enesi Y. Salawu, Oluseyi O. Ajayi, Anthony Inegbenebor, Stephen Akinlabi, Esther AkinlabiAbstractPrevious studies showed the effects of organic carbon on the mechanical properties of alloys. However, the mechanisms of graphite films formation have not been given due attention. In the present study, diffusion of carbon content via heat treatment process to produce graphite films is presented using microstructure. Consequently, the graphite films formed a protective layer on the heat treated metals which cause hardness increase and in turn improved the wear resistance of the heat treated material due to reduced coefficient of friction. The excellent tribological properties of carburized grey cast iron showed the potentials of palm kernel and egg shell for advance material modifications.
       
  • A linear program for optimizing enhanced weathering networks

    • Abstract: Publication date: September 2019Source: Results in Engineering, Volume 3Author(s): Raymond R. Tan, Kathleen B. AvisoAbstractWe develop a linear programming (LP) model for optimizing enhanced weathering (EW) networks. EW is a negative emissions technology (NET) that involves mining and grinding of naturally occurring CO2-reactive rocks, and subsequently applying the resulting powder to soil to provide ample surface area for contact with the atmosphere and thus accelerate carbon fixation. Use of EW as a carbon management strategy at scale will result in the need to properly match sources (rock crushing plants) with sinks (application sites); the result is a special case of a supply chain optimization problem. The model proposed here can determine optimal matches of sources and sinks in EW-based CMNs, considering material flow and temporal constraints. A case study is solved to illustrate the model.
       
  • Hazard Risks Pertaining to Partially Submerged Non-Stationary Vehicle on
           Low-Lying Roadways under Subcritical flows

    • Abstract: Publication date: Available online 28 August 2019Source: Results in EngineeringAuthor(s): Syed Muzzamil Hussain Shah, Zahiraniza Mustaffa, Eduardo Matínez-Gomariz, Khamaruzaman Wan Yusof, Ebrahim Hamid Hussein Al-QadamiAbstractRivers overflowing onto the floodplains can seriously disrupt the transportation system which can cause significant risks to moving or parked vehicles. The major flooding occurrence at the East Coast of Malaysia in December 2014 for instance, exhibited several hazards and fatalities involving vehicle submergence when the road conditions at low-lying flooded roadways were not known to the road users. To imitate a similar situation, the hydraulic characteristics of river overtopping an adjacent low-lying roadway during floods and the dynamics response of a vehicle attempting to cross over such flows were carried out in a modelled experimental set up. With that regards, a Perodua Viva which represents the medium-sized Malaysian passenger car was manufactured (1:10), ensuring similarity laws. Further, to monitor significant threats a flooded vehicle could face, the low-lying roadway model was designed to the allowable grade of five percent as proposed in Arahan Teknik (Jalan), ATJ 8/86. Keeping in view the height of the car and subcritical state of the flow, the range of water depths between 0.047 to 0.089 m, whereas for velocities, it was controlled to be in between 0.20 to 0.39 m/s, respectively. The buoyancy depth was noticed at depths greater than and equal to 0.055 m. Below critical depth, mode of sliding failure relied on the dominancy of varying horizontal pushing forces, namely frictional resistance, rolling friction, drag and driving forces.
       
  • Enhanced large-scale atmospheric flow interaction with ice sheets at high
           model resolution

    • Abstract: Publication date: Available online 22 August 2019Source: Results in EngineeringAuthor(s): Frederik Schenk, Ricardo VinuesaAbstractRecent development in supercomputing power allows running full-complexity Earth System Models (ESM) at increasingly higher spatial resolutions on a global scale. We show here a recent example where increased model resolution leads to a fundamental different large-scale fluid dynamical adjustment of the mean wind pattern to the presence of an ice sheet over Europe compared to a coarse resolution simulation. While the high resolution allows for a more realistic representation of atmospheric flow interaction with complex topographic features, the interpretation and prediction of the model results with a stronger bottom-up mechanical and thermal forcing on the atmosphere becomes increasingly difficult to be studied within a fully coupled model. We emphasize that interdisciplinary approaches should be pursued where the existing experience from engineering approaches of studying flow around objects and the influence of boundary-layer processes can help to disentangle the complexity within ESM. Ultimately, such engineering approaches will add a more fundamental theoretical prediction of expected flow interactions and will help climate modellers to design their model experiments accordingly.
       
  • Entropy generation for Peristaltic blood flow of a Magneto-Micropolar
           fluid with thermal radiation in a Tapered Asymmetric Channel

    • Abstract: Publication date: Available online 21 August 2019Source: Results in EngineeringAuthor(s): K. Asha S, C.K. DeepaAbstractThe present paper aims to investigate the impacts of entropy generation and thermal radiation on peristaltic blood flow of a Magneto-micropolar fluid in a tapered channel. The analysis is carried out by using the low Reynolds number and long wavelength approximations. The governing equations are solved by Adomian Decomposition Method (ADM) and the expressions for velocity, stream function, axial induced magnetic field, current density, microrotation component, pressure gradient and entropy generation are obtained. The effect of various physical parameters such as heat source/sink parameter, thermal radiation parameter, Prandtl number, Hartmann number, micropolar coupling parameter, phase difference, Brinkmann number and Bejan number is illustrated graphically. Results reveal that entropy generation deceases with an increase of magnetic parameter, whereas it decreases with an increase of thermal radiation parameter. Such result helps in biomedical sciences. Further, it is found that the micropolar fluid model is more suitable for biofluids like blood.
       
  • Non-Watertight Door Performance Experiments and Analysis Under Flooding
           Scenarios

    • Abstract: Publication date: Available online 20 August 2019Source: Results in EngineeringAuthor(s): Alison Wells, Emerald D. Ryan, Bruce Savage, Antonio Tahhan, Sneha Suresh, Cody Muchmore, Curtis L. Smith, Chad L. PopeAbstractNuclear power plant flooding can cause extensive damage. A more robust understanding of nuclear power plant performance in flooding scenarios can help identify weaknesses and opportunities for improvement. However, the performance of various components under flooding conditions is not well characterized. Limited component flooding performance characterizations interfere with comprehensive risk analysis and understanding potential economic impacts. To help address this shortcoming, doorways, common components found in nuclear power plants, were tested to determine their behavior under flooding conditions. Door flooding fragility experiments were performed in the Portal Evaluation Tank, a semi-cylindrical, 7,500-L (2,000-gal) capacity tank. The tank contains a 5.8 m2 (62.4 ft.2) square opening for the installation of testable components. The first sets of experiments were conducted using hollow core doors subjected to a water rise scenario. Tank modifications expanded testing capabilities and further testing was conducted, including industrial steel doors. From six hollow core door experiments, the lowest failure water depth was 0.71 m (28 in.) and the highest failure water depth was 0.99 m (39 in.). From thirteen outward swinging steel door experiments, the average failure depth was 0.9 m (35.4 in.) while the highest failure depth for steel doors occurred at 1.07 m (42.1 in.). An inward swinging steel door test resulted in a failure depth of 2.05 m (80.5 in.). Data collected is being analyzed using Bayesian regression methods to determine parameters of influence, inform future experiments, and generate door fragility curves, which can be integrated into comprehensive risk analysis.
       
  • Recycling Of Dyed Fiber Waste To Minimize Resistance And To Prepare
           Electro Thermal Conductive Bar

    • Abstract: Publication date: Available online 18 July 2019Source: Results in EngineeringAuthor(s): A.K.M. Nayab-Ul-Hossain, Salma Katun Sela, Sazid Bin SadequeAbstractIn preference with the gradual growth in world population along with the overall breakthrough of living standard, it has been noticeably found out that the consumption of fibers has increased worldwide in the past few decades. As a result, it leads to a higher amount of post-industrial & post-consumer waste in fiber. To subdue this large amount of waste & also to keep pace up with feasible & sustainable waste recycling process an arduous effort was taken to complete this paper which provided the emphasis on creating modified conducting bars which would subsequently signify the criteria of thermal & electrical conductivity. While completing this work the value of the textile waste & the outcomes of the recycled ones from that & also the widespread application of that recycled waste was pointed out. The outcomes i.e. Conductive bars were mostly used to record the property they showed while withstanding electrical & thermal loading. After going through different experiments, the results support the cause that the bars which were produced from waste were effective in electro thermal conductivity purpose.
       
  • Effect of the baffle inclination on the flow and thermal fields in channel
           heat exchangers

    • Abstract: Publication date: Available online 3 July 2019Source: Results in EngineeringAuthor(s): Houari AmeurAbstractResultson the flow fields and thermal distribution in a rectangular channel heat exchanger are provided in this paper. The baffling technique is used to enhance the performance of such systems. Effects of the inclination angle of baffles and the direction of inclination are investigated.
       
  • Development Of Kenaf Shive Bio–Mop Via Surface Deposit Technique For
           Water Remediation From Crude Oil Spill Contamination

    • Abstract: Publication date: Available online 29 June 2019Source: Results in EngineeringAuthor(s): Z.M. Salisu, S.U. Ishiaku, D. Abdullahi, M.K. Yakubu, B.H. Diya’uddeenAbstractSince after the discovery of bio-mop merits over the synthetic sorbents due to their secondary effect, the development of bio-based oil sorbents cast the attention of many researchers from all diaspora. This research aimed at fabricating a facile, cost effective and ultralight crude oil sorbents by modifying kenaf shive via sol-gel surface deposit method without adding any crosslinker. The studies, however, investigated and optimized crude oil sorbent sorption capacity in oil/seawater system using Response Surface Methodology (RSM) and response square equations were subsequently generated. Five-level Central Composite Design (CCD) experimental matrix was used to analyze the effect of particle sizes (125-1000μm), stirring time (5-30min) and methyltrimethoxysilane (MTMS) concentration (5-20%v/v) as individual and combined variables process in the sorbent development. A total of twenty (20) experimental runs were carried out as generated by the CCD including four (4) center points. Under corresponding optimal conditions of 560.00μm, 17.50min and 20%v/v, a sorption capability of 15.02g/g was feasible. The obtained models had correlation coefficients (R2 and R2adj) of 0.9984 and 0.9886 respectively. Further instrumental analysis such as; Brunaure-Emmett-Teller (BET), DT-TGA, XRD were carried out on the optimized sorbent and, FTIR was performed on both raw (unmodified) and the optimized kenaf shive sorbent. This finding proves a feasible approach for crude oil spill containment and water remediation.
       
  • Publisher’s Note

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s):
       
  • VIKOR Method for Ranking Concrete Bridge Repair Projects with Target-Based
           Criteria

    • Abstract: Publication date: Available online 19 June 2019Source: Results in EngineeringAuthor(s): Zhicheng Gao, Robert Y. Liang Distinguished, Tiemin XuanAbstractWith the development of intelligent and automated information system in the information era, the need for more efficient decision making method is growing. An effective method used to rank concrete bridge projects affected by reinforcement corrosion damage will help decision makers of bridge management agencies to better understand the different degrees of urgency for each project. The priority ranking process of different bridge repair projects is complex, since it is hard for decision makers to directly decide which bridge has higher priority when considering many criteria at the same time. The ranking of the different bridge repairing projects can be similar to solving multiple criteria decision making (MCDM) problems. The VIKOR (VlseKriterijumska Optimizcija I Kaompromisno Resenje in Serbian) method is a distance-to-target method which is developed and used to solve MCDM problems in material selection research. Since weights play a significant role in the priority ranking problems, objective weights based on Entropy concept and Target-based standard deviation method and dependent weights are also applied in this study. Several important criteria, which have not been considered in previous literatures, are proposed and the influence of these criteria to the bridge condition is checked and verified by using data information in NBI databased. A numerical example is proposed to illustrate the application of proposed method. Therefore, in this research a new ranking system methodology based on weighted VIKOR method with proposed criteria for ranking bridge projects is presented.
       
  • Double Diffusive Effects On Mixed Convection Casson Fluid Flow Past A Wavy
           Inclined Plate In Presence of Darcian Porous Medium

    • Abstract: Publication date: Available online 19 June 2019Source: Results in EngineeringAuthor(s): D.V. .Krishna Prasad, G.S.Krishna Chaitanya, R.Srinivasa RajuAbstractThe aim of this research paper is to study the effect of thermal diffusion (Soret) on unsteady magnetohydrodynamic mixed convection flow through an accelerated vertical wavy plate embedded in a darcian porous medium. Fundamental coupled non-linear partial differential equations with fitting boundary conditions control the flow problem. Efficient, stable, and finite element technique providing excellent convergence and versatility in accepting coupled systems of ordinary and partial differential equations is used to obtain numerical solutions for these partial differential equations. Graphical results for velocity, temperature, and concentration fields are discussed and displayed. The effects of emerging parameters on the Skin-friction are arrived at using comprehensive parametric tests. Rate of heat and mass transfer coefficients are graphically represented and examined. The results match with a special case of previously published work. From the present analysis it is reported that the presence of angle of inclination sustains a retarding effect on velocity. The velocity decreases with increasing magnetic field parameter, while the Dufour number and Soret number increase with increasing the same and the concentration field decrease as the Schmidt number increases while the temperature field decreases with increasing Prandtl number and Dufour number.
       
  • Experimental assessment of the 3-axis filament winding machine performance

    • Abstract: Publication date: Available online 11 June 2019Source: Results in EngineeringAuthor(s): Ma Quanjin, M.R.M. Rejab, Nallapaneni Manoj Kumar, M.S. IdrisAbstractThis paper presents the experimental evaluation method analysis of 3-axis filament winding machine performance. Winding circular test is a sufficient method to evaluate machine performance on winding circular repeatability and winding angle quality. It was concluded that the portable 3-axis filament winding machine had a good winding circular repeatability result, which offered 0.83-1.13 mm winding circular distance with 1.75-3.13 % standard deviation. It was provided a good winding angle quality, which relied on 0.35-0.62° difference value with 2.25-8.68 % standard deviation. It is indicated that winding circular test and winding angle measurement methods could be used as the experimental assessment to evaluate winding machine or relevant equipment on winding performance and manufacturing capability.
       
  • Switching Arc Inversion Based on Analysis of Electromagnetic
           Characteristics

    • Abstract: Publication date: Available online 11 June 2019Source: Results in EngineeringAuthor(s): Hongchen Zhao, Xiaoming Liu, Gang WangAbstractIt is difficult to describe the characteristics of an arc in low-voltage switching equipment in term of its most essential features using conventional arc models. In this paper, arc inversion is introduced to explore a new research approach to examine the nature of low-voltage switching arcs. Based on electromagnetic analysis, the arc is equivalent to a group of threadlike current segments. Then, the arc parameters are obtained by inverting the magnetic data measured at sampling point array. The multi-population genetic algorithm (MPGA) is adopted to solve the Biot-Savart operator equations to search the arc position, with the current density inversed by truncated generalized singular value decomposition (TGSVD), in which the regularization parameter is chosen by the generalized cross-validation (GCV) criterion. The result shows that, by combining the MPGA with TGSVD, both the position and current distribution of an arc can be reconstructed accurately, which can help realize arc control and guide the design of low-voltage switches with higher parameters.Index Terms-Inversion method, MPGA, switching arc, TGSVD.
       
  • Video analysis of high velocity projectile entering fluid filled tank

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): P.J. Disimile, N. ToyAbstractPressure waves are produced within a fluid filled container when a high-speed projectile impacts and penetrates the fluid at high speed. The consequence of this phenomenon is that these pressure waves may exert large pressures on the walls of the container and may lead to severe damage. The videos in this article show how these pressure waves emanate and how the cavitation region in the wake of the projectile expands and collapses.
       
  • The imaging of fluid sloshing within a closed tank undergoing oscillations

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): P.J. Disimile, N. ToyAbstractThe formation of dynamic hydraulic jumps in an oscillating rectangular container was performed and videoed with a high resolution, high-speed digital imaging system. The jumps were observed traversing between the walls of the tank when the container was oscillated near the surface wave resonance frequency based on liquid depth and it was found that the directionally based hydraulic jump formation frequency matches the driven frequency. Furthermore, the spatial characteristics of the jump are dependent on the amplitude and frequency of the oscillation.
       
  • Simulation study of the eco green roof in order to reduce heat transfer in
           four different climatic zones

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): Elham Mehrinejad Khotbehsara, Abdollah Baghaei Daemei, Farzaneh Asadi MalekjahanAbstractGreen roof have been investigated as a passive design strategy with various environmental advantages including energy efficiency. In this study the impact of the green roof on thermal behavior and reduce heat transfer of a green roof and to compare it with traditional roofs in reducing heat transfer in four different climate zones was analyzed. The simulation was conducted with DesignBuilder V. 4.5. The studied climates included humid climate represented by Rasht, semi-arid climate represented by Tabriz, tropical and subtropical desert climate represented by Yazd, and subtropical hot desert represented by Bandar Abbas. The thermal data for the green roof that were inputted into the software were composed of specifications of green roof plant species, thermal bulk properties, and green roof thermal parameters such as leaf area index and surface properties. The simulation was done on a residential building block for one year (four seasons) to specify the months in which the green roof could exhibit more optimal thermal behavior. The present study shows that the green roof in Rasht in April and July can help reduce heat loss. Furthermore, in Rasht, the value −0.02, Tabriz −0.87, Yazd −0.795 and Bandar-Abbas −0.335 will contribute to heat transfer. In the end, the green roof in Rasht can improve the reduce heat transfer in April and July.
       
  • The simulation of short-term aging based on the moisture susceptibility of
           asphalt concrete mixtures

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): Amjad H. Albayati, Mohammed H. AbduljabbarAbstractAsphalt concrete exhibit significant changes in its physical properties owing to the loss of volatile components and oxidation through the short-time aging of the binder that results from exposure to high temperatures during production in mixing plants. Because the moisture susceptibility of asphalt concrete mixes is highly dependent on binder chemistry and its physical property, consequently, the aging affects the moisture resistance of asphalt concrete pavements. However, the degree of this effect varies according to the morphology of the asphalt concrete mixture in addition to the mixture production temperature.The objective of the current AASHTO R30 guidelines for the short-term aging of asphalt concrete is to mimic the oxidation and asphalt absorption into the aggregates that would occur for a typical dense hot-mix asphalt mixture. Within these guidelines, two variables are addressed, namely temperature and time. It is well documented in the literature that the production of asphalt mixtures with different aggregate gradation types as well as temperatures as in the case of warm mix asphalt affects the short-term aging conditions. Based on the aforementioned preface, research on this topic has become necessary.To this end, job mix formulas were prepared in the laboratory for four types of wearing course mixes: dense-graded hot-mix asphalt, open-graded friction course hot-mix asphalt, gap-graded hot-mix asphalt (stone matrix asphalt) and dense-graded warm-mix asphalt. The prepared job mix formulas were forwarded to a mixing plant, and four tons of asphalt concrete mixtures were produced (1 ton each) across four different batches. Samples were taken to the laboratory, and specimens were prepared and tested to determine their moisture susceptibility based on an indirect tensile strength ratio procedure. I contrast, laboratory-produced mixes with the same mix gradations as those of the plant-produced mixes were prepared and subjected to different aging conditions (temperature and time). Their moisture resistance was then evaluated. Finally, short-term aging conditions that accurately simulate the aging process at the mixing plant were determined.
       
  • Bacteria removal efficiency data and properties of Nigerian clay used as a
           household ceramic water filter

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): Fidelis O. Ajibade, Samuel I. Akosile, Opeyemi E. Oluwatuyi, Temitope F. Ajibade, Kayode H. Lasisi, James R. Adewumi, Josiah O. Babatola, Abiose M. OguntuaseAbstractThe research was aimed at producing a cost-effective ceramic filter for the removal of bacteria in wastewater using locally sourced materials. Clay from several locations in Ekiti state, Nigeria was mixed with sawdust (combustible material) to form a ceramic filter. The results showed that the 50%–50% ratio of Igbara odo clay to sawdust was the most effective and optimum mix. This was in terms of a flow rate of 1.9 ​L/hour, removal efficiencies of 80% and 100% for coliform and E. coli bacteria respectively.
       
  • When diesel NOx aftertreatment systems meet advanced biofuels

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): J.J. Hernández, J. Rodríguez-Fernández, A. Calle-AsensioAbstractThis micro-article tries to enlighten the effect of highly potential advanced biofuels on diesel NOx after-treatment devices under the driving cycle currently used in the European Union for light-duty vehicles homologation, as well as to encourage research on this topic fort a better design and optimization of these systems. The need of reducing both CO2 emissions (by using, among others, biofuels derived from wastes) and NOx (with more realistic driving cycles as well as with catalytic systems), partly motivated by the last scandals and complaints related to the homologation procedure, have inspired this work.
       
  • New approach for enhancing the performance of gas turbine cycle:
           A comparative study

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): M.N. Khan, I. TliliAbstractIn order to achieve higher performance of combined cycle power plant and reducing greenhouse gas emission, recently different technical approaches have been used based on the choice of higher efficiency of pure mechanical components nonetheless these solution remain very expensive. Though, including original combinations of two or more systems are not well treated previously. In this paper a comparative study has been performed for three combined gas turbine cycle configurations S3, S4 and S5 including innovative combinations for both simple gas turbine cycle S1 and regenerative gas turbine cycle S2. The evaluations of these proposed configurations are executed according to the thermodynamics conventional energy and exergy analysis. The effects of the new configurations on the performance and the exergy destruction of the combined cycle plant are investigated. The results indicate that the third configuration S5 is the most beneficial for the industrialists. The analysis method is used to recognize and identify the most substantial system configuration with less exergy destruction. Models that were used in the present study give a novel alternative approach to increases not only the thermal efficiency and net output of power plant by using the same amount of fuel rate but also to reduce exergy losses.
       
  • Measurements and modeling of piston temperature in a research compression
           ignition engine during transient conditions

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): E. Mancaruso, L. SequinoAbstractThe knowledge of piston temperature during internal combustion engine operation represents a precious information to evaluate heat losses and engine efficiency. Experimental measurements of piston temperature during engine functioning is very challenging; hence, modeling this process can be very helpful. In the present work, temperature measurements have been collected using a research compression ignition engine, both in motored and fired mode. They have been used to set-up a 1d model of heat transfer through the piston optical window. A good agreement has been obtained. Moreover, the model can provide information not available from experiments.
       
 
 
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