Journal of Heat Transfer-transactions of The Asme最新文献_第3页

Natural Convective Nanofluid Flows Immersed in Oscillating Magnetic Fields Simulated by a Sub-Continuous Lattice Boltzmann Model 亚连续晶格玻尔兹曼模型模拟纳米流体在振荡磁场中的自然对流流动

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-10-18 DOI: 10.1115/1.4063575

Pengxiang Sui, Yan Su, Liyong Sun

{"title":"Natural Convective Nanofluid Flows Immersed in Oscillating Magnetic Fields Simulated by a Sub-Continuous Lattice Boltzmann Model","authors":"Pengxiang Sui, Yan Su, Liyong Sun","doi":"10.1115/1.4063575","DOIUrl":"https://doi.org/10.1115/1.4063575","url":null,"abstract":"Abstract Natural convective nanofluid flows immersed in oscillating magnetic fields are simulated with a sub-continuous nondimensional lattice Boltzmann model. The effective electrical conductivity model is built including coupled effects of nanoparticle concentrations and two Knudsen numbers. Effects of directions, frequencies, and strength amplitudes of the magnetic fields are studied in wide ranges of Hartmann numbers (0.1≤Haf,L≤600) and Rayleigh numbers (103≤Raf,L≤107). To achieve higher values of cycle averaged Nusselt numbers Nu¯̂f,L, optimal magnetic directions are along or opposite from the gravity directions. Effects of the magnetic frequency f˜B are negligible, in the conduction dominating lower Rayleigh number regime of Raf,L&lt;104. In the convection dominating regime, Nu¯̂f,L increase with Raf,L in orders of Raf,L0.48 and Raf,L0.45 for vertical and horizontal magnetic directions, respectively, and maximum values of Nu¯̂f,L appear at the optimal magnetic frequency of f˜B=1/5cs*MaL(L/UL) for all magnetic directions. With Raf,L as high as 106, the oscillating amplitudes of the transient wall mean Nusselt numbers Nu¯f,L increase with increasing Haf,L, but the cycle averaged Nusselt numbers Nu¯̂f,L decrease from 9.35 to 1.42 with increasing Haf,L in the transient regime of 5≤Haf,L≤500. Meanwhile, heat transfer patterns transit back from convection to conduction dominating patterns with increasing Haf,L, as illustrated by transient streamlines and isotherms.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Computational Modeling with Phantom-Tissue Validation of Gold-Nanorod-Enhanced Laser Ablation of Prostate Cancers 金纳米棒增强前列腺癌激光消融的幻影组织验证计算模型

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-10-06 DOI: 10.1115/1.4063651

Huishan Liang, Zhiqin Qian, Hanwei Zhang, Yigang Luo, Michael Moser, Wenjun Zhang, Bing Zhang

{"title":"Computational Modeling with Phantom-Tissue Validation of Gold-Nanorod-Enhanced Laser Ablation of Prostate Cancers","authors":"Huishan Liang, Zhiqin Qian, Hanwei Zhang, Yigang Luo, Michael Moser, Wenjun Zhang, Bing Zhang","doi":"10.1115/1.4063651","DOIUrl":"https://doi.org/10.1115/1.4063651","url":null,"abstract":"Abstract The purpose of this study was to develop a computational model for the laser ablation (LA) of prostate cancer, enhanced by gold-nanorods (GNRs) in a phantom-tissue system, and to explore the effect of GNRs on the ablation zone. A prostate biomimetic tissue (PBT) was prepared with different volume fractions of GNRs. Specifically, the computational model was built by considering the change of light properties of PBTs with and without GNRs and introducing the dynamic heat source determined by porcine liver carbonization, reported elsewhere. The computational model was then validated by comparing the simulation and the ex vivo LA experiment in terms of three performance indexes, namely, (i) the spatiotemporal temperature distribution, (ii) ablation zone, and (iii) carbonization zone, with the three volume fractions of GNRs in the PBT model, as mentioned above. Except for minor discrepancies found in the carbonization zone, the proposed model agrees with the experimental data. The effect of GNRs on LA was explored with the help of the model, and nine combinations of the laser powers and the volume fractions of GNRs were tested. The result shows that the ablation zone increases with the increase in the volume fraction of GNRs for all three laser powers used. Two conclusions can be drawn: (1) loading GNRs into the tissues may increase the ablation zone of LA, and (2) the proposed computational model is a reliable tool for predicting the spatiotemporal temperature distribution and the ablation zone of the GNR-enhanced LA.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135351532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Vapor Cloud Behaviour of Heavier-Than-Air Hydrocarbon Liquid Evaporating from a Microliter Volume Heated Well Cavity 从微升体积加热井腔中蒸发的重于空气的碳氢化合物液体的蒸气云行为

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-30 DOI: 10.1115/1.4063576

Digvijay Shukla, Pradipta Panigrahi

{"title":"Vapor Cloud Behaviour of Heavier-Than-Air Hydrocarbon Liquid Evaporating from a Microliter Volume Heated Well Cavity","authors":"Digvijay Shukla, Pradipta Panigrahi","doi":"10.1115/1.4063576","DOIUrl":"https://doi.org/10.1115/1.4063576","url":null,"abstract":"Abstract Detailed characterization of the vapor cloud above a well or reservoir is not available in literature irrespective of its several practical importance. The present study aims to understand the vapor cloud characteristics and vapor phase transport of a heavier-than-air vapor cloud evaporating from a heated microliter circular reservoir. Evaporation of a heavy hydrocarbon (cyclohexane) and a comparatively lighter fluid (ethanol) is studied. Digital holographic interferometry has been used for the characterization of vapor cloud. Gravimetric analysis is used for measurement of evaporation rate from the reservoir. A flat disk-shaped vapor cloud is observed in both heated and non-heated reservoir cases. This is attributed to the presence of radial outward natural convection. The evaporation rate is underpredicted by the diffusion model at a higher Grashof number i.e. for well heating. Solutal convection dominates near the interface region and thermal convection effect increases in the region away from the liquid-vapor interface. The mole fraction profile depends on the relative strength of the thermal and solutal Grashof number. Thermal convection effect is stronger in lighter vapor of ethanol compared to that of cyclohexane. Overall, the present study shows dominance of solutal convection on the vapor cloud characteristics above both heated and unheated reservoir.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136342307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Centennial of the Academic Careers (1919-2019) of Llewellyn M. K. Boelter and William H. McAdams: American Pioneers in Heat and Mass Transfer 卢埃林·m·k·伯尔特和威廉·h·麦克亚当斯学术生涯一百周年纪念(1919-2019):美国传热传质先驱

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-16 DOI: 10.1115/1.4063451

W.J. Marner, Raj M. Manglik

{"title":"On the Centennial of the Academic Careers (1919-2019) of Llewellyn M. K. Boelter and William H. McAdams: American Pioneers in Heat and Mass Transfer","authors":"W.J. Marner, Raj M. Manglik","doi":"10.1115/1.4063451","DOIUrl":"https://doi.org/10.1115/1.4063451","url":null,"abstract":"Abstract In the early 1900s, the heat transfer state of the art in the United States of America (USA) lagged far behind that in Europe, especially in Germany. The initial 35 years of the 20th century, however, saw major changes take place as the process industry and other research institutions increasingly began requiring a better understanding of heat and mass transfer. While many individuals have since made important contributions to the field, both past and contemporary peers in the heat and mass transfer community have identified two pioneers as having played key roles in this effort in the USA: Llewellyn Michael Kraus Boelter of the University of California - Berkley (UC-Berkley) and University of California - Los Angeles (UCLA), and William Henry McAdams of the Massachusetts Institute of Technology (MIT). They both started their respective academic positions in 1919, one on the east coast and the other on the west coast of USA. In this paper, the centenary (1919-2019) of their seminal contributions is celebrated by highlighting the early heat and mass transfer developments in the USA and the careers of both McAdams and Boelter, which have been integral to this rich history. Many of their heat transfer contributions to the evolutionary growth of the field, up to the prevailing times in the 21st century, are documented, along with commentaries and annotations.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135307722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Numerical Study on Heat Transfer and Pressure Loss Characteristics of Swirl Cooling in Elliptica Tubes with Tangential Jet Inlets 带切向射流入口椭圆管内旋流冷却传热和压力损失特性的数值研究

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-08 DOI: 10.1115/1.4063353

Fei Li, Chenglan Xiong, Yu Rao, Yong Luan, Bernhard Weigand

{"title":"Numerical Study on Heat Transfer and Pressure Loss Characteristics of Swirl Cooling in Elliptica Tubes with Tangential Jet Inlets","authors":"Fei Li, Chenglan Xiong, Yu Rao, Yong Luan, Bernhard Weigand","doi":"10.1115/1.4063353","DOIUrl":"https://doi.org/10.1115/1.4063353","url":null,"abstract":"\u0000 The paper presents a numerical study of the heat transfer, pressure loss and flow characteristics of swirl cooling in elliptical tubes, which are compared to the counterpart of swirl cooling in a circular tube with a diameter of D=50.0 mm under equal passage Reynolds numbers and equal jet Reynolds numbers. The swirl tubes with two kinds of fixed tube length of 12D and 20D are compared, where there are sequentially arranged three tangential jet inlets over the leading tube length of 12D. The numerical results show that the swirl tubes with the tube length of 12D has a much better heat transfer performance. Under equal passage Reynolds numbers, the elliptical swirl tubes with the tube length of 12D show appreciably higher Nusselt numbers by up to 22.8% and lower pressure loss coefficients by up to 69.0% than the circular tube. Under equal jet Reynolds numbers, the elliptical tubes can reduce the global heat transfer performance modestly by up to 25.6%, but reduce the pressure loss much significantly by up to 70.6%. Mostly due to much less pressure loss, the elliptical tubes have remarkably higher thermal performance in terms of the obtained heat transfer coefficient per unit pumping power for both L1=12D and L2=20D. The numerical simulations indicate that the suppression of elliptical tubes on the swirling flow development reduces the heat transfer on the wall between the jet inlets, and decreases the wall shear force and the pressure loss in the tube.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75479098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transient Thermal Performance Of Phase-Change Material Infused In Cellular Materials Based On Different Unit Cell Topologies 基于不同晶胞拓扑结构的相变材料注入胞胞材料的瞬态热性能

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-08 DOI: 10.1115/1.4063354

Karthik Nithyanandam, Prashant Singh

{"title":"Transient Thermal Performance Of Phase-Change Material Infused In Cellular Materials Based On Different Unit Cell Topologies","authors":"Karthik Nithyanandam, Prashant Singh","doi":"10.1115/1.4063354","DOIUrl":"https://doi.org/10.1115/1.4063354","url":null,"abstract":"Phase change material (PCM) employment in thermal management and energy storage applications is limited due to their inherently low thermal conductivity. Significant enhancement in the thermal performance of PCMs can be obtained when infused in porous media with high porosity and high solid-phase thermal conductivity. Earlier studies typically employ high porosity Aluminum foams obtained via a conventional manufacturing process, commonly known as foaming. A typical representative unit cell of metal foams obtained via foaming process can be of tetrakaidecahedron shape. The conventional manufacturing process of high porosity metal foams offers limited flexibility over unit cell shape, porosity, and pore density. Metal additive manufacturing advancements have the potential to address this manufacturing limitation and provides freedom in the above design domain. To this end, we have explored four different unit cell topologies, viz. Octet, Tetrakaidecahedron, Face-diagonal Cube, and Cube, for their role in enhancing the transient thermal performance when infused with PCMs. An enthalpy-porosity method has been employed to model the phase-change process for wide range of variables. It has been found that the presence of solid media results in significant enhancement in PCM's thermal performance and the Octet-shaped unit cell outperformed the other unit cell topologies explored in this study.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78303561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparisons of Overall Performance among Double-jet Film Cooling Holes, Cylinder holes, and Fan-shaped holes 双射流膜冷却孔、圆柱孔和扇形孔的综合性能比较

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-08 DOI: 10.1115/1.4063351

Jiang Lei, Jiaxu Yao, Jianhong He, Xi Yang, Kecheng Zhang, Lesley Wright

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Numerical computation of Williamson hybrid nanofluid flow over the curved surfaces with Effects of Thermal Radiation 考虑热辐射影响的曲面上Williamson混合纳米流体流动的数值计算

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-08 DOI: 10.1115/1.4063352

Iyyappan G, N. Govindraj, Ashutosh Kumar Singh

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Battery Thermal Management System On Trapezoidal Battery Pack With Liquid Cooling System Utilizing Phase Change Material 相变材料液体冷却梯形电池组的电池热管理系统

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-08 DOI: 10.1115/1.4063355

P.S.N. Masthan Vali, M. G.

{"title":"Battery Thermal Management System On Trapezoidal Battery Pack With Liquid Cooling System Utilizing Phase Change Material","authors":"P.S.N. Masthan Vali, M. G.","doi":"10.1115/1.4063355","DOIUrl":"https://doi.org/10.1115/1.4063355","url":null,"abstract":"\u0000 Electric vehicles (EVs) have grown in popularity in recent years due to their environmental friendliness and the potential scarcity of fossil fuels. Lithium-ion batteries (LIBs) are commonly utilized in EVs and hybrid electric vehicles (HEVs). They have a high specific charge, a high density of power, and a long life. A revolutionary design of a trapezoidal battery pack with a liquid cooling system based on composite phase change material (CPCM) is proposed in this research. The phase change material (PCM) is paraffin wax (PA), and the high thermal conductivity particles are graphite powder (GSP). CPCM is made in three different compositions and is filled in between cells with a 5mm gap. Because PCM has a low thermal conductivity, it is filled with GSP, a high thermal conductive particle. The thermal conductivity is increased from 0.25 to 2.7 W/m K, which increases the heat transfer rate significantly. By adjusting different coolant flow velocities at varied discharge rates, the performance of the battery pack is examined. During the experiment, the discharge rates of 1C, 2C, and 3C were used at a 28-30 °C ambient temperature. According to the findings, a trapezoidal battery pack based on CPCM exhibits a more efficient rate of heat transfer than a battery pack based on PCM. Moreover, BTMS with a liquid cooling system achieves consistent temperature distribution, with the maximum temperature remaining within the ideal range of below 45°C under all test conditions.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":" 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72381986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Bubble-Induced Strong Thermal Contraction For Graphene 气泡诱导的石墨烯强热收缩

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-08-24 DOI: 10.1115/1.4063230

Zhaozhao Qu, Chuan-Xin Cui, Jinyong Jiang

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