International Conference on Fluid Flow, Heat and Mass Transfer最新文献_第6页

Experimental Study of the Collapse of Granular Columns 颗粒柱崩塌试验研究

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.196

L. Sheng, S. Hsiau

引用次数: 0

A Numerical Investigation of the Feasibility of a Concentrating Photovoltaic Thermal System based on Point-Focus Fresnel Lens 基于菲涅耳透镜的聚光光伏热系统可行性的数值研究

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.215

Rida Ali Hmouda, Y. Muzychka, X. Duan

引用次数: 0

Effect of Stack Position and Stack Length on the Performance of Thermoacoustic Engine 烟囱位置和烟囱长度对热声发动机性能的影响

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.208

Yara Al Masalmeh, Ussama Ali, Md. Islam, I. Janajreh

引用次数: 1

Experimental Analysis and CFD Modelling of the Flow Conditions inside an Air-Core-Liquid-Ring Atomizer 气芯-液环雾化器内部流动条件的实验分析与CFD建模

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.157

Miguel A. Ballesteros, V. Gaukel

{"title":"Experimental Analysis and CFD Modelling of the Flow Conditions inside an Air-Core-Liquid-Ring Atomizer","authors":"Miguel A. Ballesteros, V. Gaukel","doi":"10.11159/ffhmt22.157","DOIUrl":"https://doi.org/10.11159/ffhmt22.157","url":null,"abstract":"- The Air-Core-Liquid-Ring (ACLR) atomization is an innovative internal-mixing pneumatic atomization technique, suitable for energy-efficient spray drying because of its ability to handle highly viscous liquid feeds with high solid contents. However, pneumatic atomizers such as the ACLR can suffer from unstable internal flow conditions, which may lead to a wide variation in the droplet diameter obtained. Therefore, the internal flow conditions of an ACLR-atomizer prototype needed to be studied and comprehended. With that in mind, a computational fluid dynamic (CFD) model was developed, and tested with experimental data collected for different gas pressures and liquid feed viscosities. A mesh independence study, as well as some testing of Physics models were performed. A mixed polyhedral – prismatic mesh was generated, and the k-ω SST model was selected as it showed a good balance between representation of the turbulence in the system and computational effort. The predicted average lamella thickness is similar with experimental results, with an average 10 % error, but the thickness variations observed in the experiments dampen quickly over time in the simulations. This is not the case in the experiments with the higher viscous maltodextrin solution. Therefore, further model refining has still to be done. Nonetheless, the flow behaves as expected in the CFD simulation with changes in pressure and liquid viscosity. This opens up the possibilities of doing more in-detail CFD studies of the effect of liquid feed properties and geometrical variations of the nozzle.","PeriodicalId":308878,"journal":{"name":"International Conference on Fluid Flow, Heat and Mass Transfer","volume":"36 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":"121922015","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

Reduction of the Recirculation Region of a Backward-Facing Step Flow 后向阶跃流的再循环区域减小

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.201

J. Arthur

引用次数: 0

Magnetohydrodynamic Natural Convection of In-Ga-Sn Alloy in a Horizontal Concentric Annulus with Internal Fins in - ga - sn合金在带内翅片的水平同心环内的磁流体力学自然对流

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.204

Aidan Hickie-Bentzen, S. Tasnim, S. Mahmud

{"title":"Magnetohydrodynamic Natural Convection of In-Ga-Sn Alloy in a Horizontal Concentric Annulus with Internal Fins","authors":"Aidan Hickie-Bentzen, S. Tasnim, S. Mahmud","doi":"10.11159/ffhmt22.204","DOIUrl":"https://doi.org/10.11159/ffhmt22.204","url":null,"abstract":"- The use of low melting point liquid metals in the thermal management of various systems has seen a recent increase in popularity with the increasing power of commercial CPUs. Natural convection in concentric annuli has also been a popular topic in the literature for decades due to the applications in nanotechnology and energy storage systems. In this study, numerical simulations are performed to investigate magnetohydrodynamic natural convection heat transfer in a horizontal concentric annulus with internal straight, Y-shapes, and T-shaped fins approximated as thin layers. A mix of transient and steady state simulations are conducted using COMSOL Multiphysics® with constant temperature boundary conditions to generate laminar natural convection profiles in the enclosure filled with a eutectic In-Ga-Sn alloy. The average Nusselt number (Nu) at the outer boundary is calculated to compare all simulation results. The Rayleigh number (Ra) is varied to investigate the stability of the flow profile over time, first without fins and then with straight fins. The three fin geometries are then compared at various Ra values to gauge their relative performance, and lastly the magnetic field is implemented at constant Ra for various Hartmann numbers (Ha). The fins are found to increase the stability of the flow profile over time, while the Y-shaped fins increase Nu by up to 318.7% compared to no fins at Ra = 10 4 . The magnetic field forces more even heat dissipation through the enclosure, and at Ha = 20, Nu increases by a further 78.1% for the Y-shaped fins at Ra = 10 4 .","PeriodicalId":308878,"journal":{"name":"International Conference on Fluid Flow, Heat and Mass Transfer","volume":"18 1 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":"127005596","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

Irradiation-Duration Effect on the Performance of Solar Hot Water Storage Tanks containing Phase Change Material (PCM) 辐照时间对相变材料(PCM)太阳能蓄热水箱性能的影响

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.142

A. Dayan

引用次数: 0

Characterizing Non-Newtonian Two-Phase Flow in Airlift Pumps 气升泵内非牛顿两相流特性研究

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.187

Josh Rosettani, Dana Fadlalla, W. Ahmed

引用次数: 1

A Multiphase Flow Approach for Ethanol Blended Fuels 乙醇混合燃料的多相流方法

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.197

M. Bayraktar, Can Ünsal, R. Eslami, A. Özalp

引用次数: 0

Polymeric Hollow Fiber Heat Exchangers in Higher Temperatures 高温聚合物中空纤维热交换器

International Conference on Fluid Flow, Heat and Mass Transfer Pub Date : 2022-06-01 DOI: 10.11159/ffhmt22.192

T. Kroulíková, E. Bartuli, T. Kůdelová

引用次数: 0