发布求助
文献互助 智能选刊 最新文献

Journal of Advanced Thermal Science Research最新文献

筛选
英文 中文
Energetic Assessment of an Electronic and a Thermostatic Expansion Valve for a Variable Capacity Compressor 可变容量压缩机电子膨胀阀和恒温膨胀阀的能量评价
Journal of Advanced Thermal Science Research Pub Date : 2019-10-25 DOI: 10.15377/2409-5826.2019.06.6
O. Ekren
{"title":"Energetic Assessment of an Electronic and a Thermostatic Expansion Valve for a Variable Capacity Compressor","authors":"O. Ekren","doi":"10.15377/2409-5826.2019.06.6","DOIUrl":"https://doi.org/10.15377/2409-5826.2019.06.6","url":null,"abstract":"In this study, a chiller system with an electronic expansion valve (EEV) and a thermostatic expansion valve (TXV) were compared from an energy saving view under variable and fixed speed compressor. The experimental chiller system under study has a variable speed scroll compressor, EEV and TXV, air cooled condenser and auxiliary equipments. The R134a was used in the compressor as a refrigerant. Although in variable speed chiller systems usually EEVs are used, in this study a TXV was also used to compare its performance. The results of the experimental studies show that the chiller system with EEV has 30% lower superheat value and 6% lower power consumption than the chiller system with TXV under variable speed operation. From the fixed speed compressor view, the chiller system with TXV performs 1.7% lower superheat value than the chiller system with EEV and, the chiller system with EEV has 8.5% higher compressor power consumption than TXV.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123616565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heat and Mass Transfer Analysis for the MHD Forced Convective Flow of a Nanofluid over a Slendering Stretching Sheet with Radiation in Porous Medium 多孔介质中纳米流体在带辐射的细长拉伸片上的MHD强制对流传热传质分析
Journal of Advanced Thermal Science Research Pub Date : 2019-10-14 DOI: 10.15377/2409-5826.2019.06.4
R. Gorla
{"title":"Heat and Mass Transfer Analysis for the MHD Forced Convective Flow of a Nanofluid over a Slendering Stretching Sheet with Radiation in Porous Medium","authors":"R. Gorla","doi":"10.15377/2409-5826.2019.06.4","DOIUrl":"https://doi.org/10.15377/2409-5826.2019.06.4","url":null,"abstract":"Computational analysis of radiative heat and mass transfer of nanofluid over a slendering stretching sheet in porous medium with uneven heat source and slip effects have been carried out in this article. The transformed equations a of the flow model are solved by the Runge-Kutta scheme coupled with shooting method to depict the dimensionless velocity, temperature, and concentration at the boundary layer. Numerical computations are carried out and discussed for skin friction coefficient and local Nusselt number. We found an excellent agreement of the present results with the existed results under some special conditions. It is also found that the heat transfer performance is high in the presence of velocity slip effect. Dimensionless skin-friction coefficient has decreased for increasing magnetic field, power lawindex with velocity slip and wall thickness.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133776399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Unsteady MHD Natural Convection Flow of Nanofluid in a Cavity Containing Adiabatic Obstacle with Heat Corners 含热角绝热障碍腔内纳米流体的非定常MHD自然对流流动
Journal of Advanced Thermal Science Research Pub Date : 2019-10-14 DOI: 10.15377/2409-5826.2019.06.5
R. Gorla
{"title":"Unsteady MHD Natural Convection Flow of Nanofluid in a Cavity Containing Adiabatic Obstacle with Heat Corners","authors":"R. Gorla","doi":"10.15377/2409-5826.2019.06.5","DOIUrl":"https://doi.org/10.15377/2409-5826.2019.06.5","url":null,"abstract":"Department of Mathematics, Aswan University, Faculty of Science, Aswan, 81528, Egypt Department of Mathematics, Assuit University, Faculty of Science, Assuit, Egypt Department of Mechanical Engineering, Cleveland State University, Cleveland, Ohio 44115 USA COMSATS University Islamabad, Attock Campus, Kamra Road, 43600, Attock, Pakistan Basic and Applied Sciences Department, College of Engineering and Technology, Arab Academy for Science & Technology and Maritime Transport (AASTMT), Aswan Branch, Egypt","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"251 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133159349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Experimental Investigation Thermal Performance of Loop Heat Pipe Operating with Different Working Fluids 不同工质工况下回路热管热性能的实验研究
Journal of Advanced Thermal Science Research Pub Date : 2019-05-17 DOI: 10.15377/2409-5826.2019.06.3
A. Miyara, K. Kariya, K. Htoo, P. Huynh
{"title":"Experimental Investigation Thermal Performance of Loop Heat Pipe Operating with Different Working Fluids","authors":"A. Miyara, K. Kariya, K. Htoo, P. Huynh","doi":"10.15377/2409-5826.2019.06.3","DOIUrl":"https://doi.org/10.15377/2409-5826.2019.06.3","url":null,"abstract":"Nowadays, due to the tremendous development of data centers (DCs), studying the effective cooling methods that can face to the challenges such as the high power or heat flux dissipation and the efficient electricity consumption in DCs has never been unnecessary. Loop heat pipe (LHP), a two-phase heat transfer device, is being considered as one of the potential solutions for the above problems. This paper introduces the experimental study on the thermal performances of LHP functioning under gravity assisted condition with different working fluids that are water and ethanol (C2H5OH). This LHP has the flat-rectangular evaporator with the stainless-steel (SS) sintering wick installed inside. The results demonstrate that under the same condenser cooling condition, water LHP performed better than ethanol LHP. In the case of water LHP, when heating power was increased from 33 to 535 W, the temperature at the top surface of the heating block raised from 38C to 110C. With the ethanol LHP, this temperature reached 133C at the heating power of 395 W. If temperature limitation of microprocessors functioning inside the DCs is recognized at 85C, the cooling capabilities of LHP are 220 W and 350 W corresponding to the working fluid are ethanol and water respectively. In addition, the discussions about the difference in boiling heating transfer characteristics as well as condenser performances between water LHP and ethanol LHP are also presented in this study.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115282502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Spatial Behavior of the Steady State Vibrations in a Dual-Phase-Lag Rigid Conductor 双相位滞后刚性导体稳态振动的空间特性
Journal of Advanced Thermal Science Research Pub Date : 2019-02-14 DOI: 10.15377/2409-5826.2019.06.1
S. Chiriţă, C. D'apice, V. Zampoli
{"title":"Spatial Behavior of the Steady State Vibrations in a Dual-Phase-Lag Rigid Conductor","authors":"S. Chiriţă, C. D'apice, V. Zampoli","doi":"10.15377/2409-5826.2019.06.1","DOIUrl":"https://doi.org/10.15377/2409-5826.2019.06.1","url":null,"abstract":"Abstract: This paper studies the spatial behavior of the steady state vibrations in a cylinder made of a dual-phase-lag anisotropic rigid conductor material. We analyze the influence of the lagging model upon the spatial behavior of the amplitude of vibration along the axis of the cylinder, providing the explicit expressions of the decay rate and of the corresponding critical frequency in terms of the coefficients of the considered constitutive equation (or delay times). In fact, for the amplitude of the harmonic vibrations we obtain some exponential decay estimates of Saint-Venant type, provided the frequency of vibration is lower than a critical value. This gives information on the thermal penetration depth of the steady state vibrations describing the heat affected zone. Illustrative examples are given for the class of lagging behavior models that are thermodynamically compatible.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"652 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122961966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Mixed Convective Transport Around Staggered Rows of Square Cylinders 交错排列的方形圆柱体周围的混合对流传输
Journal of Advanced Thermal Science Research Pub Date : 2019-02-14 DOI: 10.15377/2409-5826.2019.06.2
D. Chatterjee, Advanced Design
{"title":"Mixed Convective Transport Around Staggered Rows of Square Cylinders","authors":"D. Chatterjee, Advanced Design","doi":"10.15377/2409-5826.2019.06.2","DOIUrl":"https://doi.org/10.15377/2409-5826.2019.06.2","url":null,"abstract":"The unsteady mixed convective transport around multiple bluff objects placed in a staggered configuration with respect to a uniform free stream flow is analyzed through two-dimensional numerical computation. The bluff objects are identical in shape and size with square cross-section and arranged in two different rows within an unconfined domain. A small temperature difference between the objects and the free stream results in the free convection in addition to the forced flow. Simulation is carried out using a finite volume based method considering a uniform cross flow of air (Prandtl number = 0.71) at a moderate Reynolds number (= 100). The transverse spacing between the cylinders may anticipated to influence significantly the wake dynamics, which in turn affects the thermal transport. Simultaneously, the mixed convective strength also influences the wake dynamics and vortex structure formation. An interplay between these two effects aptly dictates the resulting flow dynamics and associated thermal transport. Accordingly, the dimensionless transverse spacing is varied (= 1, 3 and 5) along with the mixed convective strength (Richardson number = 0-2). It is observed that the flow and thermal fields show chaotic nature at smaller transverse spacing. However, at larger spacing, the usual unsteady vortex dynamics persists. Very interestingly it is observed that the chaotic flow at smaller transverse spacing reduces its instability to become unsteady periodic at larger strength of the thermal buoyancy. The average heat transfer from the cylinders is found more at smaller transverse spacings and it increases with increasing mixed convective strength.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121887125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Combustion and Emission Performance of an HCCI Engine Fuelled by n-Heptane/Toluene Blends at a Low-Load Operating Condition 低负荷工况下正庚烷/甲苯混合燃料HCCI发动机的燃烧与排放性能
Journal of Advanced Thermal Science Research Pub Date : 2019-01-03 DOI: 10.15377/2409-5826.2018.05.3
Hongsheng Guo, Mining Energy, W. Neill
{"title":"Combustion and Emission Performance of an HCCI Engine Fuelled by n-Heptane/Toluene Blends at a Low-Load Operating Condition","authors":"Hongsheng Guo, Mining Energy, W. Neill","doi":"10.15377/2409-5826.2018.05.3","DOIUrl":"https://doi.org/10.15377/2409-5826.2018.05.3","url":null,"abstract":"Homogeneous charge compression ignition (HCCI) engine technology offers high fuel efficiency and extra low nitrogen oxide (NOx) and particulate matter (PM) emissions, which makes it a potential alternative combustion mode to conventional diesel engines. A diesel fuel is usually composed of many classes of hydrocarbons among which aromatic compounds have attracted special attention due to their specific combustion characteristics. Understanding the combustion and emission characteristics of different classes of hydrocarbons is crucial for identifying appropriate diesel fuels suitable for HCCI combustion. Toluene is a typical aromatic compound in a diesel fuel. A study of toluene content may provide implications of the effect of aromatic in a diesel fuel on HCCI combustion. In this paper, the combustion and emission performance of an HCCI engine fuelled by n-heptane/toluene blends at a low load operating condition was investigated by experiment and numerical simulation. A modified Cooperative Fuel Research (CFR) engine and a in-house-developed multi-zone model were employed. The engine was operated at the condition of engine speed of 900 rpm, relative air/fuel ratio of 3.5 and without external exhaust gas recirculation. The investigated fuel blends covered a range from pure n-heptane to 70% toluene by volume. Both experimental and numerical results showed that an increase in toluene fraction in the fuel blend retarded combustion phasing. As a result, the optimal compression ratio, at which thermal efficiency reached its maximum for a fuel blend, increased with increasing toluene fraction. The maximum thermal efficiency increased as the toluene fraction increased from 0 to 50%, but then decreased with further increasing toluene fraction to higher values. The peak pressure rise rate also increased with increasing toluene fraction at a constant combustion phasing. An increase in toluene fraction resulted in an increase in unburned hydrocarbon emissions but had little effect on NOx emissions.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132668709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modified Effectiveness Model for Crossflow Packed-Bed Humidifiers 修正的横流填充床加湿器效能模型
Journal of Advanced Thermal Science Research Pub Date : 2019-01-03 DOI: 10.15377/2409-5826.2018.05.4
M. Sharqawy, Robert Zinni
{"title":"Modified Effectiveness Model for Crossflow Packed-Bed Humidifiers","authors":"M. Sharqawy, Robert Zinni","doi":"10.15377/2409-5826.2018.05.4","DOIUrl":"https://doi.org/10.15377/2409-5826.2018.05.4","url":null,"abstract":"A model for the energy effectiveness of cross-flow packed-bed humidifiers is developed and compared with experimental data. The effectiveness of the humidifier is defined as the sensible and latent heat transferred to the air to the maximum total energy available to the humidified air. Simultaneous heat and mass transfer models; available in the literature and originally developed forwent counter flow cooling towers, are utilized to develop a modified model in this paper. The main modification added to that model is a definition of the heat capacity ratio that combines the simultaneous heat and mass transfer transport in that cross-flow packed-bed humidifiers. It was found that the mixedmixed crossflow heat exchanger effectiveness relationship developed by Kays and London agrees well with the experimental data with an average deviation of less than 10%. The mixed-unmixed correlation developed by Kays and London [12] which was recommended by Jaber and Webb is found to have larger deviation from the experimental measurements occurred at higher heat capacity ratios.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121599939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Evaluation of Correlations for Predicting Pressure Drop of Air-Water Flow in Narrow Rectangular Duct 窄矩形风管内空气-水流动压降预测的相关性评价
Journal of Advanced Thermal Science Research Pub Date : 2019-01-03 DOI: 10.15377/2409-5826.2018.05.5
Liang Zhao, Min Du, Licheng Sun, Guangfei Wang
{"title":"An Evaluation of Correlations for Predicting Pressure Drop of Air-Water Flow in Narrow Rectangular Duct","authors":"Liang Zhao, Min Du, Licheng Sun, Guangfei Wang","doi":"10.15377/2409-5826.2018.05.5","DOIUrl":"https://doi.org/10.15377/2409-5826.2018.05.5","url":null,"abstract":"Aiming at developing a more common method for predicting two-phase flow pressure drop for small channels, experiments on frictional pressure drop of air-water flow in a vertical narrow rectangular duct with a cross-section of 40 mm by 1.6 mm were conducted at atmospheric pressure. The mass flow rates of air and water covered the ranges from 0.03 to 12.5 kg/h and from 19 to 903 kg/h, respectively. It was found that the two-phase flow can be divided into three regions according to the liquid only Reynolds number, by which a modified Chisholm two-phase multiplier was proposed for predicting frictional pressure drop. Some leading correlations for predicting two-phase flow pressure drop were compared with the new correlation against current experimental data, the latter had and a mean deviation of 7.2%, showing a better agreement with the experimental results.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124505764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a Transient Model for Evaluation of Shell and Tube Heat Exchanger with Helical Baffles Applied for SiO2 Nanofluid 应用于SiO2纳米流体的螺旋折流板管壳式换热器瞬态模型的建立
Journal of Advanced Thermal Science Research Pub Date : 2019-01-03 DOI: 10.15377/2409-5826.2018.05.2
S. Cartaxo
{"title":"Development of a Transient Model for Evaluation of Shell and Tube Heat Exchanger with Helical Baffles Applied for SiO2 Nanofluid","authors":"S. Cartaxo","doi":"10.15377/2409-5826.2018.05.2","DOIUrl":"https://doi.org/10.15377/2409-5826.2018.05.2","url":null,"abstract":"Abstract: While integrated sizing and analysis procedures for helical shell-and-tube heat exchangers are available in the technical literature, the same does not hold for differential transient methods. This work aims to develop a differential transient model for a shell-and-tube heat exchanger with helical baffles with one pass in the shell and two passes in the tubes, considering one-dimensional variation along the length of the equipment. It is intended to determine the fluids temperature profiles and overall heat transfer coefficient along the equipment. Temperature correction factor Ft, heat load and pressure losses were estimated with the model. The thermophysical properties of the fluids were locally evaluated by using published predictive correlations. Simulations were performed using Python framework computing environment assuming a SiO2 nanofluid.","PeriodicalId":244913,"journal":{"name":"Journal of Advanced Thermal Science Research","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116902399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信