剪切力驱动下混合对流问题的介观模拟  

Mesoscopic Simulations of Mixed Convection Driven by the Shear Force

作　　者：罗小平[1] 曹知红 易红亮[1] 谈和平[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《工程热物理学报》2015年第5期1057-1062,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51121004;No.51176040)

摘　　要：本文采用能量守恒耗散粒子动力学(eDPD)方法研究了内含椭圆热源的封闭方腔内的对流换热问题。提出一种处理曲面边界和移动边界的新方法,模拟了剪切力驱动的混合对流换热问题以及椭圆热源被迫旋转引起的混合对流换热问题,分析了剪切力方向、理查森数Ri和椭圆被迫旋转对混合对流换热特性的影响,并且得到了不同条件下的流线图和等温线图。研究结果表明,横向剪切时Ri数对方腔内的传热影响并不显著而纵向剪切时Ri对方腔内的流动与传热的影响非常明显;椭圆热源被迫旋转给流场带来扰动,使等温线发生扭曲,但是整个流场的结构没有发生根本性的改变。The present work is aimed to study mixed convection heat transfer in a square enclosure with a heated elliptic cylinder by energy-conserving Dissipative Particle Dynamics(eDPD).A novel boundary treatment for curve and moving boundary is introduced to simulate mixed convection due to the shear force,and mixed convection due to the free rotating of the elliptic heat source.The influences of directions of the shear force,Richardson Number,and the free rotating elliptic cylinder on heat transfer are also explored.Finally,the isotherms and streamlines for different conditions are derived.It is founded that the influence of Richardson Number on heat transfer characteristics is significant when the vertical shear force is imposed while insignificant when the horizontal shear force is imposed.There is obvious disturb on streamlines and isotherms when the elliptic cylinder is induced to rotate,but there is no fundamental change for the total vertical structure.

关 键 词：耗散粒子动力学 混合对流 封闭方腔 介观模拟 

分 类 号：O572.2[理学—粒子物理与原子核物理]