ASME Journal of Heat and Mass Transfer最新文献_第7页

Understanding Inconsistencies in Thermohydraulic Characteristics Between Experimental and Numerical Data for Di Water Flow Through a Rectangular Microchannel 理解矩形微通道中迪水流实验数据与数值数据在热水力学特性上的不一致性

ASME Journal of Heat and Mass Transfer Pub Date : 2023-12-20 DOI: 10.1115/1.4064330

Mark Schepperle, N. Samkhaniani, M. Magnini, Peter Woias, Alexander Stroh

{"title":"Understanding Inconsistencies in Thermohydraulic Characteristics Between Experimental and Numerical Data for Di Water Flow Through a Rectangular Microchannel","authors":"Mark Schepperle, N. Samkhaniani, M. Magnini, Peter Woias, Alexander Stroh","doi":"10.1115/1.4064330","DOIUrl":"https://doi.org/10.1115/1.4064330","url":null,"abstract":"Facing discrepancies between numerical simulation, experimental measurement and theory is common in studies of fluid flow and heat transfer in microchannels. The cause of these discrepancies is often linked to the transition from the macro-scale to the micro-scale, where the flow dynamics might be expected to deviate due to possible change in dominant forces. In this work, an attempt is made to achieve agreement between experiment, numerical simulation and theoretical description within the usual framework of laminar flow theory. For this purpose, the pressure drop, friction factor, and Poiseuille number under isothermal conditions and the temperature profile, heat transfer coefficient, Nusselt number, and thermal performance index under diabatic conditions (heating power of 10 W) in a heat sink with a stainless steel microchannel with a hydraulic diameter of 850 µm were investigated numerically and experimentally for mass flow rates between 1 and 68 g/min. The source of inconsistencies in pressure drop characteristics is found to be linked to the geometrical details of the utilized microchannel, e.g. the design of inlet/outlet manifolds, the artefacts of manufacturing technique and other features of the experimental test rig. For the heat transfer characteristics, it is identified, that an appropriate estimation of the outer boundary condition for the numerical simulation remains the crucial challenge to obtain a reasonable agreement. The manuscript presents a detailed overview on how to consider these details to mitigate the discrepancies and to establish a handshake between experiments, numerical simulations and theory.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"139 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171035","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

Transient Process Analysis of Oscillating Motion in Oscillating Heat Pipes 摆动热管中摆动运动的瞬态过程分析

ASME Journal of Heat and Mass Transfer Pub Date : 2023-12-20 DOI: 10.1115/1.4064331

Roberto Nunez, Hongbin Ma

引用次数: 0

Temperature Distribution in a Non-Prismatic Thermoelectric Leg and the Energy Conversion Efficiency 非棱镜型热电腿的温度分布与能量转换效率

ASME Journal of Heat and Mass Transfer Pub Date : 2023-12-20 DOI: 10.1115/1.4064328

Zhihe Jin

{"title":"Temperature Distribution in a Non-Prismatic Thermoelectric Leg and the Energy Conversion Efficiency","authors":"Zhihe Jin","doi":"10.1115/1.4064328","DOIUrl":"https://doi.org/10.1115/1.4064328","url":null,"abstract":"It has been proposed that asymmetric thermoelectric (TE) legs may enhance the TE energy conversion efficiency. This work presents an analytical model for the temperature field in non-prismatic TE legs and the energy conversion efficiency. Different from the models available in the literature, the present one-dimensional (1D) heat equation for thermal conduction in non-prismatic legs is derived from the general three-dimensional energy and charge balance laws and the thermoelectric constitutive relations considering Joule heating and the Seebeck effect on the heat flow. The temperature field in a TE leg with an arbitrary gradient of the cross sectional area is obtained using the 1D heat equation. The temperature field and energy conversion efficiency are calculated for exponential and quadratic Bi2Te3 legs as well as an exponential PbTe leg. The numerical results indicate that leg tapering has minimal effects on the temperature distribution in and energy efficiency of the non-prismatic leg under the prescribed cold and hot side temperatures boundary conditions provided that the volume of the leg remains the same. The energy efficiency of the tapered leg, however, can be significantly increased under the prescribed hot side heat flux condition. Finally, a simple estimate on the limitation of the 1D models for non-prismatic legs is discussed.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139170863","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

Theoretical Study On Falling Film Fin-Tube Dehumidifier Integrated with an Evaporative Cooler 关于集成蒸发冷却器的降膜式翅片管除湿机的理论研究

ASME Journal of Heat and Mass Transfer Pub Date : 2023-12-20 DOI: 10.1115/1.4064329

Kalpana, S. Subudhi

引用次数: 0

Boiling Heat Transfer Performance of Pure Water On Binary Oxide Based Nanoparticles Coatings 二元氧化物基纳米粒子涂层上纯水的沸腾传热性能

ASME Journal of Heat and Mass Transfer Pub Date : 2023-12-09 DOI: 10.1115/1.4064220

Nitish Kumar, Pradyumna Ghosh, P. Shukla

引用次数: 0

Experimental Study on Thermal Management of Nano Enhanced Phase Change Material Integrated Battery Pack 纳米增强型相变材料集成电池组热管理实验研究

ASME Journal of Heat and Mass Transfer Pub Date : 2023-11-29 DOI: 10.1115/1.4064155

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

{"title":"Experimental Study on Thermal Management of Nano Enhanced Phase Change Material Integrated Battery Pack","authors":"P.S.N. Masthan Vali, M. G.","doi":"10.1115/1.4064155","DOIUrl":"https://doi.org/10.1115/1.4064155","url":null,"abstract":"In recent years, lithium-ion batteries have grown in popularity. Because of their extended cycle life and high energy density. A hexagon-shaped 18650 lithium-ion cylindrical cell battery pack was created using paraffin wax (PA) as a Phase change material (PCM) and nano-enhanced phase change material (Ne-PCM). However, the PCM's low thermal conductivity is a main challenge to the improvement of electrical vehicles (EVs). The highest temperature in the cylindrical cell battery pack is attained in the mid-region, resulting in an uneven temperature distribution across the cells. In order to overcome the constraints and achieve efficient battery module performance, phase change with nanomaterials was placed in the center of four cells using graphene platelet nano powder (GPN), multi-wall carbon nano tubes (MWCNTs), and graphite-synthetic powder (GSP). Studies on the battery module were conducted without, with PCM, and Ne-PCM cooling. The investigation found that the battery pack with Ne-PCM performed well by keeping the temperature under 50 °C at different discharge rates of 1C, 2C, and 3C and maintaining a uniform temperature variation within cells. Ne-PCM decreases the temperature differential between the modules at 1, 2, and 3 C discharge rates by 85.49, 91.47, and 84.21%, respectively, in comparison to PCM.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139215137","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

Film Cooling Performance on a Turbine Blade with Subregional Compound Angle 具有次区域复合角的涡轮叶片的薄膜冷却性能

ASME Journal of Heat and Mass Transfer Pub Date : 2023-11-29 DOI: 10.1115/1.4064153

Guoqing Li, Ang Li, Zhang Shen, Chenfeng Wang, Xingen Lu

{"title":"Film Cooling Performance on a Turbine Blade with Subregional Compound Angle","authors":"Guoqing Li, Ang Li, Zhang Shen, Chenfeng Wang, Xingen Lu","doi":"10.1115/1.4064153","DOIUrl":"https://doi.org/10.1115/1.4064153","url":null,"abstract":"Under the function of passage secondary flow, film cooling deviates from the streamwise on turbine blade which directly, not what we want, results in uneven film coverage. On pressure side, film appears divergent while it is bunched on suction side. To solve this problem, Subregional compound angle is proposed. Based on the experimental result, the design scheme of multiple working cases and compound angles is implemented. Results show that five regions along the spanwise could be divided on pressure side. Under the effect of horseshoe vortex, the film deviation in the root region is the most serious. When the compound angle increases to -30°, this phenomenon can be effectively weakened, and the deviation angle decreases along the streamwise as the horseshoe vortex gradually moves away from the blade surface. Different from pressure side, two subdivisions are added along the streamwise on suction side because, besides the horseshoe vortex, the effects of passage vortex grow up. In addition, the film deviation of the root region is more obvious than that of pressure side. The entrainment of stronger passage vortex makes the film improvement from increasing compound angle more difficult downstream of the suction side. Overall, compound angle can weaken the Counter Rotating Vortex Pair and improve the averaged film cooling effectiveness.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139210134","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

Truncated Cone - A Universal Primitive Shape for Axisymmetric View Factor Systems 截顶锥--轴对称视因子系统的通用基本形状

ASME Journal of Heat and Mass Transfer Pub Date : 2023-11-29 DOI: 10.1115/1.4064154

Peter Cumber

引用次数: 0

Estimating the Thermal Conductivity of Thin Films: A Novel Approach Using the Transient Plane Source Method 估算薄膜的导热性：使用瞬态平面源方法的新方法

ASME Journal of Heat and Mass Transfer Pub Date : 2023-11-16 DOI: 10.1115/1.4064052

David Landry, Renzo Flores, Renée Goodman

引用次数: 0