International Conference on Fluid Flow, Heat and Mass Transfer最新文献_第2页

Post-Blackout Response of Backup Power Supply on the Safety of Nuclear Fuel Storage Vault 备用电源停电后对核燃料库安全的响应

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.170

V. K. Mishra, S. K. Panda, B. Sen, B. Rao, M. Maiya

引用次数: 0

Estimation of Mixed-Matrix Membrane Relative Permeability Using Monte Carlo Simulation 用蒙特卡罗模拟估计混合基质膜的相对渗透率

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.270

Zhengbin Cao, Haoyu Wu, B. Kruczek, J. Thibault

{"title":"Estimation of Mixed-Matrix Membrane Relative Permeability Using Monte Carlo Simulation","authors":"Zhengbin Cao, Haoyu Wu, B. Kruczek, J. Thibault","doi":"10.11159/ffhmt22.270","DOIUrl":"https://doi.org/10.11159/ffhmt22.270","url":null,"abstract":"The greater availability of computational power has allowed researchers to investigate the mass transport of a chemical species at various scales of dimension and time from the atomistic to a more macroscopic level. To estimate the relative permeability of mixed-matrix membranes, Monte Carlo (MC) simulations can be used advantageously with respect to the ease of simulation coding and computational time. MC simulation has been used for a large number of applications including studying the migration of species within a membrane. To account for the migration of molecules through a mixed-matrix membrane using MC simulations, a statistically significant and constant number of molecules are allocated on the upstream interface of the membrane (i.e. a constant gas pressure) whereas, for the downstream side of the membrane, molecules exiting the membrane are immediately removed (i.e. a perfect vacuum). Because the polymeric membrane with embedded nanofillers of a mixed-matrix membrane have different diffusivity and solubility coefficients, the displacement rate and the molecule density in each medium have to be considered to adequately represent the permeation of molecules. The MC simulation is performed in a dynamic mode with where the upstream interface molecules are allowed to freely migrate according to Brownian movement. After a certain number of iterations, the molecule concentration across the membrane and the total population inside the membrane become relatively constant. Under this steady state, the number of molecules entering the upstream interface becomes equal to the number of molecules leaving at the downstream interface. Results show that the relative permeability, calculated as the ratio of the steady state molecule flux of the mixed-matrix membrane and the steady-state flux of the neat polymeric membrane, is accurate and corresponds to the value obtained by solving the three-dimensional diffusion equation via the finite difference method (FDM). In most cases, the computation time to obtain the same","PeriodicalId":308878,"journal":{"name":"International Conference on Fluid Flow, Heat and Mass Transfer","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126094733","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

Experimental Investigation of Contact Heat Transfer at High Pressures 高压下接触换热的实验研究

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.140

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

{"title":"Experimental Investigation of Contact Heat Transfer at High Pressures","authors":"T. Göttlich, T. Helmig, Nicklas Gerhard, T. Bergs, R. Kneer","doi":"10.11159/ffhmt22.140","DOIUrl":"https://doi.org/10.11159/ffhmt22.140","url":null,"abstract":"- Besides the mechanical description of technical systems, a thermal modelling is frequently required. In this context, contact heat transfer coefficients are essential boundary conditions for the thermal simulation of technical systems consisting of several 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 a novel 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.","PeriodicalId":308878,"journal":{"name":"International Conference on Fluid Flow, Heat and Mass Transfer","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121617357","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

Comparison of Experimental Heat Transfer Coefficient with Qualitative Description of Classical Heat Transfer Coefficient at Low Heat Flux Conditions 低热流密度条件下实验换热系数与经典换热系数定性描述的比较

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.185

E. G. Bediako, P. Dančová, T. Vít

引用次数: 0

Modelling Of Pulverized Coal Combustion with the Char Structure Effect in Melter-Gasifier 煤粉在熔炼-气化炉中燃烧的煤焦结构效应模拟

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.147

Yoon-Ho Bae, Kang-min Kim, B. Lee, C. Jeon

引用次数: 0

Numerical Analysis of Horizontally Placed Closed Loop Pulsating Heat Pipe for Electronic Cooling 电子冷却用水平布置闭环脉动热管的数值分析

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.207

Roshan Devidas Bhagat, S. Deshmukh

引用次数: 1

Modeling of Additive Manufacturing-like Rough Walls from Roughness-resolved LES Database 基于粗糙度分解LES数据库的类增材制造粗壁建模

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.164

A. Barge, Serge Meynet, V. Moureau, G. Balarac, A. Hadjadj, G. Lartigue

{"title":"Modeling of Additive Manufacturing-like Rough Walls from Roughness-resolved LES Database","authors":"A. Barge, Serge Meynet, V. Moureau, G. Balarac, A. Hadjadj, G. Lartigue","doi":"10.11159/ffhmt22.164","DOIUrl":"https://doi.org/10.11159/ffhmt22.164","url":null,"abstract":"Extended Abstract Recent development of additive manufacturing (AM) in the past decade paves the way for breakthrough designs of heat exchangers and especially for compact ones (CHX). However, the surface roughness generated with AM is larger compared to conventional manufacturing processes. In addition, the roughness is basically anisotropic. The impact of this type of roughness on pressure drop and heat transfer coefficient cannot be neglected during the design process. Numerical RANS and LES simulations have proven to be efficient tools for optimization purposes and are appropriate candidates to fulfill this need. Nonetheless, for realistic cases, required computational resources to conduct simulations with roughness are not affordable in general. Thus, the modeling of the effects of the rough elements on the flow without explicit representation of the surface details is compulsory. Common approaches for RANS/LES rough wall modeling rely on the prediction of the mean wall stress through a modified smooth law of the wall. The modification of the law of the wall mainly follows empirical correlations obtained from experimental data and roughness resolved simulations. In line with this philosophy, a first objective at our concern is to enrich the empirical correlations with data from typical AM roughness. This kind of approach is theoretically designed to predict the mean value of","PeriodicalId":308878,"journal":{"name":"International Conference on Fluid Flow, Heat and Mass Transfer","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127194320","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

Investigation of the Waste Heat Recovery System of a Biomass Combustion Plant through Ground Source Heat Pumps 地源热泵生物质燃烧装置余热回收系统研究

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.131

Babak Dehghan B., Linwei Wang, M. Motta, Nader Karimi

引用次数: 0

Ansys Fluent Automation for Fluid Flow and Heat Transfer in Corrugated Channels Ansys Fluent自动化波纹通道中的流体流动和传热

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.206

M. Shaimi, R. Khatyr, J. Naciri

引用次数: 3

Machine Learning Based Statistical Characterization of a Turbulence Dissipation Rate Array: A Revisitation 基于机器学习的湍流耗散率阵列统计表征:回顾

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.132

N. Scott, Jack McCarthy

引用次数: 0