Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21)最新文献

Investigating the Impacts of Longitudinal and Lateral Distances on theLift and Drag Coefficients of two Closely Moving Vehicles 研究纵向和横向距离对两个紧密移动的车辆升力和阻力系数的影响

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.113

Mohammadreza Saber Ashkezari, A. Mohammad, M. Darbandi, G. Schneider

引用次数: 0

Design and CFD Simulation of Interior Wind Guides for the Four DryCooling Towers of Shazand Power Plant to Improve the Performance ofCooling System in Critical Peak Hours 沙山电厂4座干式冷却塔内导风槽设计及CFD仿真研究

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.119

M. Darbandi, Kazem Mashayekh, Pooya Javadpour-Langroodi, Fakhereh Seyedi, G. Schneider, Shahram Iranpak, Javad Farhadi

引用次数: 0

The Fluid Dynamics of Rising and Evaporating Droplet in an Immiscible Liquid 非混相液体中液滴上升和蒸发的流体动力学

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.101

A. Kendoush

引用次数: 0

Lattice Boltzmann and Gas Kinetic Flux Solvers and Their Applications 晶格玻尔兹曼和气体动力学通量求解及其应用

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.002

C. Shu

{"title":"Lattice Boltzmann and Gas Kinetic Flux Solvers and Their Applications","authors":"C. Shu","doi":"10.11159/icffts21.002","DOIUrl":"https://doi.org/10.11159/icffts21.002","url":null,"abstract":"The macroscopic governing differential equations in fluid mechanics can be discretized by the finite volume method (FVM), and the conservative flow variables at cell centres can be given from the solution of discrete governing equations. In the solution process, we need to evaluate numerical fluxes at cell interfaces from the solution at cell centres. Currently, there are two kinds of approaches to reconstruct the solution for evaluation of numerical fluxes. One is mathematical approach, which is based on smooth function approximation. The other is physical approach, which is based on the solution of governing equation or simplified governing equation. A good example in this category is the Riemann solver, which is based on solution of one-dimensional Euler equation. In this talk, a brief review of current flux solvers will be presented first. Then the newly-developed lattice Boltzmann flux solver and gas kinetic flux solver will be shown in details. These solvers evaluate viscous and inviscid fluxes simultaneously and physically. They combine advantages of conventional Navier-Stokes solvers and lattice Boltzmann/gas kinetic solvers. The fluid flows from incompressible regime to hypersonic regime can be well simulated by these solvers. The proposed new flux solvers will be validated by various numerical examples.","PeriodicalId":101634,"journal":{"name":"Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121874864","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 Study of Supercritical R134a Heat Transfer in a HorizontalRibbed Tube for Trans-Critical ORC Systems 跨临界ORC系统水平肋管内超临界R134a传热数值研究

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.102

Dabiao Wang, Hang Lu, E. Fang, Lanlan Li

{"title":"Numerical Study of Supercritical R134a Heat Transfer in a Horizontal\u0000Ribbed Tube for Trans-Critical ORC Systems","authors":"Dabiao Wang, Hang Lu, E. Fang, Lanlan Li","doi":"10.11159/icffts21.102","DOIUrl":"https://doi.org/10.11159/icffts21.102","url":null,"abstract":"- Internally ribbed tubes can improve TORC (Trans-critical Organic Rankine Cycle) heat transfer economics and safety by improving the heat transfer coefficient and restricting buoyancy effects in horizontal flows. The heat transfer characteristics of supercritical organic fluids in internally ribbed tubes need to be more thoroughly understood. The present study calculated the flow and temperature fields in a horizontal ribbed tube to analyze the heat transfer enhancement of super critical R134a and the buoyancy effects on the heat transfer. The results show that the heat transfer enhancement near the pseudo critical point is mainly caused by the large specific heat effect in the boundary layer. The buoyancy enhances the radial direction velocities (x and y directions) and reduces the axial speed (z direction) along the top of the horizontal tube. The lower axial speed reduces the turbulent kinetic energy and the top side heat transfer coefficient as a result. The simulation results were also compared with the heat transfer in a smooth horizontal tube and vertical ribbed tube with upwards flow. The results showed that the spiral follow induced by the internal ribs strongly restricts the buoyancy flow. Vertical upwards flow has a higher overall heat transfer coefficient and no circumferential temperature gradients, which improves the heat transfer economics and safety in TORC systems. Hence, vertical flow heat exchangers should be considered in TORC systems due to the improved heat transfer.","PeriodicalId":101634,"journal":{"name":"Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131734602","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

An Immersed Boundary Projection Method for ComplexFluid-Structure-Interaction Simulation 复杂流固耦合仿真的浸入边界投影法

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.005

Weixiong Huang, Luohao Wang

引用次数: 0

Frontiers in Numerical Optimization of Heat Sinks 散热器数值优化的前沿

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.004

G. M. Mauro

{"title":"Frontiers in Numerical Optimization of Heat Sinks","authors":"G. M. Mauro","doi":"10.11159/icffts21.004","DOIUrl":"https://doi.org/10.11159/icffts21.004","url":null,"abstract":"We live the age of revolutions that will change the World, named energy & digital transition and Industry 4.0. One key aspect of such revolutions lies in microand nano-technologies, i.e., in the capillary diffusion of miniaturized electronic devices in industrial, IT equipment and automotive sectors. The high thermal power “produced” by these systems, coupled with the lack of well-designed heat sinks, can cause system failure and permanent damages. Since the chances of that happening increase with the system miniaturization and complexity, the mentioned revolutions amplify the need of optimizing the thermal design of heat sinks, focusing on electronics’ cooling devices. Moreover, the great progresses in additive manufacturing and 3D printing techniques are strongly changing the general approach to the problem formulation. Here, the focus is on the latest explored ways and frontiers in the numerical optimization of heat sinks’ thermal performance, e.g., shape, size and topology optimizations, arranging the main design approaches and revealing the main limitations, e.g., geometrical, computational, and unsolved issues, together with conventional and innovative manufacturing processes. Therefore, ranging from active – i.e., smart surfaces – to passive – i.e., optimizing heating surfaces – heat sinks’ enhancement, the aim is to summarize the guidelines for an integrated design procedure.","PeriodicalId":101634,"journal":{"name":"Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127438814","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

Analysis of Vorticity Distribution in a Closed Partially Porous Domain 封闭部分多孔区域涡度分布分析

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.114

Abhijit Verma

引用次数: 0

Heating and Evaporation of Droplets on a Super-hydrophobic Surface:Preliminary Results 液滴在超疏水表面的加热和蒸发:初步结果

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.120

D. Antonov, R. Fedorenko, P. Strizhak, S. Sazhin

{"title":"Heating and Evaporation of Droplets on a Super-hydrophobic Surface:\u0000Preliminary Results","authors":"D. Antonov, R. Fedorenko, P. Strizhak, S. Sazhin","doi":"10.11159/icffts21.120","DOIUrl":"https://doi.org/10.11159/icffts21.120","url":null,"abstract":"Extended Abstract The importance of investigating the heating and evaporation of droplets on hydrophobic (contact angle ∼ 110°) and superhydrophobic (contact angle ∼ 160°) surfaces is well known [1]. Several models of the phenomena have been suggested and described in the literature [2,3]. All the models described so far, however, have been based on numerical solutions to the relevant transport equations and their applicability to the analysis of practical engineering problems is limited in many cases [3]. This abstract is focused on the preliminary results of the development of a new simple model of the phenomena. This model can capture the most important features of the processes and is simple enough for most engineering applications . The new model assumes that the contact area of the droplet with the superhydrophobic surface is much smaller than the area of the droplet surface. This assumption allows us to consider the droplet heating and evaporation as spherically symmetric processes. Heat supply to the droplet through the contact area of the droplet with the surface is considered as perturbation. Heating of the droplet by ambient gas is described by a spherically symmetric heat conduction equation with the Robin boundary condition at the droplet surface. The effective thermal conductivity model, in which the effect of ambient air velocity is accounted for by the modification of the liquid thermal conductivity, was used. The analytical solution to the heat conduction equation is incorporated into the numerical code and used at each","PeriodicalId":101634,"journal":{"name":"Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21)","volume":"289 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115863726","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

Convective Heat Transfer inside a Rotating Cylinder Experiencing anAxial Air Flow 经历非轴向气流的旋转圆筒内的对流换热

Proceedings of the 2nd International Conference on Fluid Flow and Thermal Science (ICFFTS'21) Pub Date : 2021-11-01 DOI: 10.11159/icffts21.117

D. Adair, Bakhtiyar Kalzhan

引用次数: 0