An Immersed Boundary based method for studying thermal interaction of particles in a viscous fluid

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	An Immersed Boundary based method for studying thermal interaction of particles in a viscous fluid
	Feng ZG; Paudel BD; Zhang X(张星); Feng, Z.-G. (zhigang.feng@gmail.com)
会议录名称	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
	2010
会议名称	ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting, FEDSM 2010 Collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
会议日期	August 1, 2010 - August 5, 2010
会议地点	Montreal, QC, Canada
摘要	The results of thermal interactions between a solid particle and a fluid have two folds: the motion of fluid affects the heat transfer and energy balance of a particle; and the heat transfer from particles influences the fluid motion. When the temperature of a particle and its surrounding fluid is not the same, heat is transferred between the particle and the fluid. The heat flux influences the properties of the surrounding fluid and changes the dynamics of the sedimentation of the particle. To study the effect of non-isothermal flows to the motion of a particle, we have developed a Direct Numerical Simulation (DNS) method that is capable of solving both the momentum equation and heat transfer equation for the computation of thermal interaction between particles and fluid. This numerical method makes use of a finite difference method in combination with the Immersed Boundary (IB) method for treating the particulate phase. In particular, the IB concept has been extended to treat thermal boundary condition at the particle surface. A regular Eulerian grid is used to solve the modified momentum and energy equations for the entire flow region simultaneously. In the region that is occupied by the solid particles, a second particle-based Lagrangian grid is used, which tracks particles, and a force density function or an energy density function is introduced to represent the momentum interaction or thermal interaction between particle and fluid. In this paper, the IB based DNS method has been applied to study the fluidization of 12,000 circular particles, the unsteady conduction of a sphere in a stagnant fluid, and the sedimentation of a non-isothermal sphere in a viscous fluid at different Grashof number. Our simulation results show that the sedimentation velocity of the particle depends strongly on the thermal interaction of particle and fluid due to the strong buoyancy force exerted on the particle. Copyright © 2010 by ASME.
关键词	Buoyancy Forces Circular Particle Energy Density Functions Energy Equation Eulerian Grids Flow Regions Fluid Motions Force Density Function Heat Transfer Equations Immersed Boundary Lagrangian Momentum Equation Momentum Interaction Nonisothermal Nonisothermal Flows Particle Surface Sedimentation Velocities Simulation Result Solid Particles Thermal Boundary Conditions Thermal Interaction Viscous Fluids
WOS记录号	WOS:000307365700264
课题组名称	LNM湍流
ISBN号	9780791849484
URL	查看原文
收录类别	CPCI-S ; EI
语种	英语
引用统计
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/60351
专题	非线性力学国家重点实验室
通讯作者	Feng, Z.-G. (zhigang.feng@gmail.com)
推荐引用方式 GB/T 7714	Feng ZG,Paudel BD,Zhang X,et al. An Immersed Boundary based method for studying thermal interaction of particles in a viscous fluid[C]American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM,2010.

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