Journal of fluid flow, heat and mass transfer最新文献_第4页

Effective Thermal Conductivity Model for Tetragonal Pin Array Stack 四边形引脚阵列堆叠的有效导热系数模型

Journal of fluid flow, heat and mass transfer Pub Date : 2022-01-01 DOI: 10.11159/jffhmt.2022.005

Elio Di Giulio, Armando Di Meglio, N. Massarotti, R. Dragonetti

引用次数: 1

Application of DLVO Modeling to Predict Critical pH for Fines Migration Pre- and Post-SiO2 and MgO Nanofluid Treatments in Sandstones 应用DLVO模型预测砂岩中sio2和MgO纳米流体处理前后细粒迁移临界pH值

Journal of fluid flow, heat and mass transfer Pub Date : 2022-01-01 DOI: 10.11159/jffhmt.2022.014

R. Muneer, P. Pourafshary, M. Hashmet

引用次数: 4

Real-Time Measurement Technique for Slug Flow Characterisation 段塞流特性的实时测量技术

Journal of fluid flow, heat and mass transfer Pub Date : 2022-01-01 DOI: 10.11159/jffhmt.2022.023

Seyyed Saeed Shojaee Zadeh, V. Egan, P. Walsh

引用次数: 1

Experimental Analysis of Initial Wettability Effect on the Performance of Hybrid Engineered Water-Assisted Polymer Flooding 初始润湿性对复合水助聚合物驱驱油性能影响的实验分析

Journal of fluid flow, heat and mass transfer Pub Date : 2022-01-01 DOI: 10.11159/jffhmt.2022.015

M. Shakeel, P. Pourafshary, M. Hashmet

引用次数: 0

Air Bleed and Paint Drain Analysis for an Automotive E-Dip Process using Volume-of-Fluid Model with Hybrid Time Advancement Scheme 基于混合时间推进方案的流体体积模型对汽车电浸过程的排气和油漆排放进行了分析

Journal of fluid flow, heat and mass transfer Pub Date : 2022-01-01 DOI: 10.11159/jffhmt.2022.007

V. Aggarwal, Tushar Patil, V. Patil, I. Lockley

引用次数: 0

A Transient Response Comparison of a Conventional and a Meso Heat Exchanger under Mass Flow and Temperature Step Changes 质量流量和温度阶跃变化下传统换热器和介观换热器的瞬态响应比较

Journal of fluid flow, heat and mass transfer Pub Date : 2021-07-12 DOI: 10.11159/jffhmt.2021.022

Shahram Fotowat, S. Askar, A. Fartaj

{"title":"A Transient Response Comparison of a Conventional and a Meso Heat Exchanger under Mass Flow and Temperature Step Changes","authors":"Shahram Fotowat, S. Askar, A. Fartaj","doi":"10.11159/jffhmt.2021.022","DOIUrl":"https://doi.org/10.11159/jffhmt.2021.022","url":null,"abstract":"- The increasing worldwide energy consumption problem motivates the effective management of thermal systems. A heat exchanger is an important component in many thermal systems, such as a radiator of an engine cooling system in vehicles. Heat exchangers are generally designed and characterized to work under steady-state conditions. However, a change in operating conditions exposes heat exchangers to a transient state, therefore, it is important to study their transient responses for better control of the system and efficiency improvement. In this study, the experimental responses of two types of heat exchangers: conventional, and meso heat exchangers subjected to a sudden change in inlet temperature and mass flow rate of the hot fluid are compared and presented. The transient outlet temperature responses of both hot and cold fluids as well as the transient heat exchanger effectiveness and heat transfer rate variations are found in this work. A general empirical correlation is obtained for the hot fluid transient dimensionless outlet temperature subjected to mass flow rate step change. Furthermore, results show that the meso heat exchanger exhibited higher heat transfer rate and effectiveness as well as reached steady state faster than the conventional heat exchanger. Even though the meso heat exchanger has a longer initial delay time, it possesses a higher response time than a conventional heat exchanger, regardless of the step change.","PeriodicalId":92806,"journal":{"name":"Journal of fluid flow, heat and mass transfer","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84881396","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

Numerical and Experimental Investigation of Flow Maldistribution due to Blockage in Microstructured Heat Exchanger 微结构换热器堵塞引起的流动不均匀的数值与实验研究

Journal of fluid flow, heat and mass transfer Pub Date : 2021-01-01 DOI: 10.11159/JFFHMT.2021.021

S. Sadir, Christoph Spiegel, W. Augustin, S. Scholl, M. Kraut

{"title":"Numerical and Experimental Investigation of Flow Maldistribution due to Blockage in Microstructured Heat Exchanger","authors":"S. Sadir, Christoph Spiegel, W. Augustin, S. Scholl, M. Kraut","doi":"10.11159/JFFHMT.2021.021","DOIUrl":"https://doi.org/10.11159/JFFHMT.2021.021","url":null,"abstract":"- Microstructured heat exchangers typically comprise a number of parallel microchannels with inlet and outlet headers. The uniformity of flow rates among the parallel microchannels is governed by the field of fluid pressure in the system. This contribution presents, three dimensional (3D) CFD simulations performed using OpenFOAM (Open-Source Field Operation and Manipulation) by employing simpleFOAM solver to investigate flow distribution in an array of four parallel microchannels with a hydraulic diameter of 500 µm each. The working fluid is water and an incompressible, single-phase flow is assumed. The maldistribution is induced by complete or partial blockage of single microchannels in different scenarios. Both number of blocked microchannels and position of the blockage inside the channel array are altered. The results show the effects of induced blockage on the fluid flow distribution in the parallel microchannels. The standard deviation of flow distribution not only depends on the total number of the blocked microchannels but also on their position inside the flow array. For validating CFD results, pressure drop and flow distribution are also investigated through various experiments. Therefore, pressure drop measurements for different scenarios are conducted. A good agreement between simulation and experiment is observed. Simulation studies reveal that the free cross-section is not the governing criterion for both flow distribution and heat exchange. Fouling on the hot surface more strongly influences the outlet temperature than completely blocked channels. The contribution shows that even with a relatively simple model, interesting effects in microstructured heat exchangers can be found, allowing for a deeper understanding of the specific properties of micro structures.","PeriodicalId":92806,"journal":{"name":"Journal of fluid flow, heat and mass transfer","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73883945","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

Analytical Solution of Steady State Heat Transfer In Two Orthotropic Cylinders 两个正交各向异性圆柱体稳态传热的解析解

Journal of fluid flow, heat and mass transfer Pub Date : 2021-01-01 DOI: 10.11159/jffhmt.2021.026

Mohammed Nikchi, H. Hamza, J. Lahjomri, A. Oubarra

引用次数: 0

Numerical Investigation of the Optimization of PV-System Performances Using a Composite PCM-Metal Matrix for PV-Solar Panel Cooling System 基于pcm -金属复合基体优化pv -太阳能板冷却系统性能的数值研究

Journal of fluid flow, heat and mass transfer Pub Date : 2021-01-01 DOI: 10.11159/jffhmt.2021.028

Naomie Beolle Songwe Selabi, A. R. K. Lenwoue, Lesly Dasilva Wandji Djouonkep

{"title":"Numerical Investigation of the Optimization of PV-System Performances Using a Composite PCM-Metal \u0000Matrix for PV-Solar Panel Cooling System","authors":"Naomie Beolle Songwe Selabi, A. R. K. Lenwoue, Lesly Dasilva Wandji Djouonkep","doi":"10.11159/jffhmt.2021.028","DOIUrl":"https://doi.org/10.11159/jffhmt.2021.028","url":null,"abstract":"During the conversion of solar photovoltaic energy, the heat generated raises the temperature and results in reduced electricity conversion efficiency of the system. As the operating temperature plays a great role in the photovoltaic conversion process, cooling the operating surface is a key factor to consider in achieving higher efficiency. Numerical investigation using composite phase change materials (PCMs) in photovoltaic-cooling (PV-cooling) system was adopted in this study. Selected materials such as CaCl2.6H2O, paraffin wax, RT25, RT27, SP29, n-octadecane were used as PCMs while copper, aluminium, steel, nickel, polystyrene, polychlorovinyl and polypropylene were used as composite(matrix) materials. A two-dimensional transient heat transfer model based on enthalpy approach developed by computational Fluid Dynamics (CFD-Ansys-Fluent software) was utilized for optimization and enhancing the energy conversion efficiency. The numerical results showed that RT25 sphere has good compatibility with PV-cooling system, and the thermal conductivity barely had a significant value on PV-temperature for larger values, excepted for very low thermal conductivity materials such as plastics.","PeriodicalId":92806,"journal":{"name":"Journal of fluid flow, heat and mass transfer","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80614114","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

Horizontal Axis Wind Turbine Power Coefficient as Relative Capture Area 作为相对捕获面积的水平轴风力机功率系数

Journal of fluid flow, heat and mass transfer Pub Date : 2021-01-01 DOI: 10.11159/jffhmt.2021.027

T. Adams, B. Mertz

引用次数: 1