Journal of fluid flow, heat and mass transfer最新文献_第2页

Comparison between Different PCM Mediums and Dielectric Fluid for Hybrid Thermal Management of Electric Battery Packs 不同PCM介质和介电流体对电池组混合热管理的比较

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.009

Seham Shahid, M. Agelin-chaab

{"title":"Comparison between Different PCM Mediums and Dielectric Fluid for Hybrid Thermal Management of Electric Battery Packs","authors":"Seham Shahid, M. Agelin-chaab","doi":"10.11159/jffhmt.2023.009","DOIUrl":"https://doi.org/10.11159/jffhmt.2023.009","url":null,"abstract":"- In this paper, a hybrid cooling strategy for Lithium-ion electric battery packs is developed through the combination of air, liquid, and phase change material mediums. The hybrid strategy consists of the primary cooling medium that surrounds all the Lithium-ion cells and is in direct contact with the surface of the cells. The secondary cooling medium is housed within liquid channels placed in the battery pack to extract heat from a primary cooling medium. Furthermore, an air duct is placed at the top of the battery to extract heat from the fluids that are stationary within the liquid channels. Three distinct concepts are developed to compare the effect of phase change material and liquid medium as the primary cooling medium. In the first and second concepts, the primary cooling medium used is a phase change material, and in the third concept, it is an electrically insulated fluid. The numerical model is validated from experimental results in the open literature. Transient numerical studies were conducted and validated. The results indicate that through the first concept, the maximum temperature was limited to 31.5  C and the temperature uniformity to 1.75  C. Moreover, this strategy does not require excessive pumping fluid power and high air velocities, which implies that less energy is required for the operation of the thermal management system.","PeriodicalId":92806,"journal":{"name":"Journal of fluid flow, heat and mass transfer","volume":"91 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80551189","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

Comparison of Hybrid Cooling Concepts with PCM Cooling for Electric Battery Packs 电池组混合冷却与PCM冷却的比较

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.010

Seham Shahid, M. Agelin-chaab

引用次数: 0

Influence Of Catalyst On Producer Gas Quality In Fixed Bed Gasifier Using Lignite And Wood Feedstock 褐煤和木材固定床气化炉催化剂对产气质量的影响

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.008

D. Upadhyay, A. Chaudhary, Akshit Trada, Dhruvil Patel, Rajesh N. Patel

引用次数: 0

Impact of Particle Size on the Selection of a Representative Bed Section for Poly-Dispersed Fixed Bed Reactors 粒径对多分散固定床反应器代表性床段选择的影响

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.004

Stylianos Kyrimis, R. Raja, L. Armstrong

{"title":"Impact of Particle Size on the Selection of a Representative Bed Section for Poly-Dispersed Fixed Bed Reactors","authors":"Stylianos Kyrimis, R. Raja, L. Armstrong","doi":"10.11159/jffhmt.2023.004","DOIUrl":"https://doi.org/10.11159/jffhmt.2023.004","url":null,"abstract":"– Computational Fluid Dynamics (CFD) models are a valuable tool for the design, optimization, and scaling-up of fixed bed chemical reactors. However, the realistic representation of the catalytic bed structure and the mesh quality of the 3D geometry is of paramount importance to improve the accuracy of CFD models. For the former, computed tomography (CT) is a non-destructive method to map and generate the internal structure of experimental fixed bed reactors, enabling a direct 1-to-1 coupling between experiments and simulations. In our previous work, the internal structure of highly poly-dispersed fixed bed reactors, formed by sieved particles, was analysed. The particles that formed them displayed a wide range of sizes, shapes, and orientations. Due to the local topological complexity of these beds, meshing and simulating their entire volume would lead to exhaustive computational demands. To reduce these, a suitable sample section should be selected, which accurately represents both the bulk and the radial porosity of the full bed. Three distinct sample sections were quantified here for their accuracy, identifying that, due to the highly heterogeneous nature of the full beds, sample selection is case sensitive. In addition, compared to smaller particles, larger particles form more heterogeneous local structures, thus requiring longer sections to accurately represent the full bed. A selected 10% section was then meshed, and its hydrodynamic profile resolved, to evaluate its mesh independency. The results highlight the importance of choosing a suitable bed section and mesh size to reduce the computational demands, minimise the computational errors, and achieve the desired level of solution detail.","PeriodicalId":92806,"journal":{"name":"Journal of fluid flow, heat and mass transfer","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72533146","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

Drag Reduction of a NACA Aerodynamic Airfoil: A Numerical Study NACA气动翼型减阻的数值研究

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.013

Amine Agriss, Mohamed Agouzoul, Abdeslem Ettaouil

引用次数: 0

The Impact of Collisions on Heat Transfer in a Particle-Laden Shearless Turbulent Flow 碰撞对含颗粒无剪切湍流传热的影响

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.018

Hamid Reza Zandi Pour, Michele Iovieno

引用次数: 0

Optimization of Powertrain Parameters of a Battery Electric Vehicle for Shuttle Service Usage 班车用纯电动汽车动力系统参数优化

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.014

Murat Otkur, Abdullah Khalfan

{"title":"Optimization of Powertrain Parameters of a Battery Electric Vehicle for Shuttle Service Usage","authors":"Murat Otkur, Abdullah Khalfan","doi":"10.11159/jffhmt.2023.014","DOIUrl":"https://doi.org/10.11159/jffhmt.2023.014","url":null,"abstract":"– Although Electric Vehicles (EVs) had been used for transportation since the end of 19 th century, they were superseded by Internal Combustion Engine (ICE) propelled vehicles due to limited performance and low driving range problems. In the last 2 decades considering the performance advancements and price drop in the battery technology, EVs started to gain significant attention and usage. Furthermore, they have zero in use emissions, reducing the effects of fossil fuels in terms of air pollution and Global Warming (GW). However, compared to ICE propelled vehicles main drawbacks like low driving range and long charging durations limit the favourability of EVs. Considering special use cases such as shuttle services in specified areas, these drawbacks lose their importance. The proposed study involves, the selection design and optimization of an EV to be used in the American University of the Middle East (AUM) campus considering the main objective as to complete the daily tasks with a single charge during the night. A longitudinal vehicle model is generated for the EVs in MATLAB/Simulink, a benchmarking vehicle is selected using vehicle model outputs and parameter optimization for battery capacity and final drive ratio (FDR) is performed. The final design has 32.47 % less battery capacity, 1.94 % less vehicle weight and 7.901 seconds 0 – 25 kph vehicle acceleration duration, 17.86 % less than the original selected configuration. The results of this study will serve as a valuable input for the autonomous driving car development project planned at AUM.","PeriodicalId":92806,"journal":{"name":"Journal of fluid flow, heat and mass transfer","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136371597","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

Numerical and Experimental Study of The Viscous Dissipation of Oil inside the Electric Motor’s Gap 电动机间隙内油液粘性耗散的数值与实验研究

Journal of fluid flow, heat and mass transfer Pub Date : 2023-01-01 DOI: 10.11159/jffhmt.2023.006

A. M. Teamah, Mohamed S. Hamned

引用次数: 0

Enhancement of an Experimental Methodology for the Investigation of Contact Heat Transfer at High Pressures 高压下接触传热实验方法的改进

Journal of fluid flow, heat and mass transfer Pub Date : 2022-01-01 DOI: 10.11159/jffhmt.2022.019

T. Göttlich, T. Helmig, Nicklas Gerhard, T. Bergs, R. Kneer

{"title":"Enhancement of an Experimental Methodology for the Investigation of Contact Heat Transfer at High Pressures","authors":"T. Göttlich, T. Helmig, Nicklas Gerhard, T. Bergs, R. Kneer","doi":"10.11159/jffhmt.2022.019","DOIUrl":"https://doi.org/10.11159/jffhmt.2022.019","url":null,"abstract":"- Besides the mechanical description of technical systems, a thermal modelling is frequently required. For technical systems consisting of several individual components, the contact heat transfer coefficient is an essential boundary condition between the individual components. This parameter is mainly influenced by the surface structure and roughness of the contact partners as well as the applied contact pressure. However, although the influencing parameters are well known, an analytical determination is quite difficult. Therefore, an experimental quantification is mandatory. So far, experiments in literature have primarily focused on the investigation of contact heat transfers at moderate loads up to 100 MPa. Nevertheless, there are some applications where solids are in contact at very high pressure and resulting heat transfer between them plays an essential role, such as the interface between the tool and the workpiece during machining. The aim of this work is to present an enhanced experimental methodology to determine contact heat transfers at high loads. In this approach, infrared thermography is used to measure the temperature data, which is consequently used to solve an inverse problem using the conjugate gradient method, which provides the corresponding contact heat transfer coefficients. Furthermore, first experimental results for a load-dependent heat transfer for loads between 200 and 1200 MPa are presented and occurring effects are discussed. Unrestricted distribution, and reproduction in medium are permitted, provided the original work is properly cited.","PeriodicalId":92806,"journal":{"name":"Journal of fluid flow, heat and mass transfer","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82370312","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

Experimental Study of Flow Boiling Heat Transfer at Low Heat Fluxes 低热流密度下流动沸腾传热的实验研究

Journal of fluid flow, heat and mass transfer Pub Date : 2022-01-01 DOI: 10.11159/jffhmt.2022.018

E. G. Bediako, P. Dančová, T. Vít

引用次数: 0