重力水平对热毛细-浮力对流耗散结构的影响  

Effect of Gravity Level on Flow Pattern of Thermocapillary-Buoyant Convection

作　　者：李友荣[1,2] 莫东鸣[1] 彭岚[1,2] 石万元[1,2] 

机构地区：[1]重庆大学动力工程学院,重庆400044 [2]低品位能源利用技术及系统教育部重点实验室,重庆400044

出　　处：《工程热物理学报》2011年第8期1269-1272,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50776102);中央高校基本科研业务费资助项目(No.CDJXS10142224);重庆大学"211工程"三期创新人才培养计划建设项目(No.S-09101)

摘　　要：为了了解重力水平对环形液池内热毛细-浮力对流耗散结构的影响,利用有限容积法进行了非稳态三维数值模拟,环形液池外壁被加热,内壁被冷却,流体为0.65cSt硅油,其Pr数为6.7。结果表明,在微重力条件下,流动为三维振荡流动;当重力水平增加到0.1go时,流动结构转化为沿周向运动的一组滚胞,其轴线与温度梯度方向一致;当重力水平增加到0.5go时,流型则为一组静止的滚胞;当重力水平继续增加到3go时,流动转变为稳定流动。In order to understand the effect of gravity level on the flow pattern of thermocapillary- buoyant convection in an annular pool, a series of unsteady three-dimensional numerical simulations were carried out with finite-volume method. The pool was filled with the 0.65cSt silicone oil （Prandtl number Pr----6.7）, and heated from the outer cylindrical wall and cooled at the inner wall. The simulation results show that the three-dimensional oscillatory flow appeared at micro-gravity. When g=O.lgo, the flow pattern transits extended roll cells travelling in the azimuthal direction. If the gravity level increases to 0.Sgo, the stable three-dimensional flow happened. Further, at g=3.0go, the thermocapillary-buoyant convection transits the steady axially symmetric flow.

关 键 词：数值模拟 流型 热毛细-浮力对流 环形液池 

分 类 号：TK123[动力工程及工程热物理—工程热物理]