一种抑制热对流不稳定方法  

New way to suppress the instability of thermal convection

作　　者：林松[1] 敬成君[2] 

机构地区：[1]广西工业职业技术学院机电系,广西南宁530003 [2]西南交通大学机械工程学院,四川成都610031

出　　处：《华北电力大学学报（自然科学版）》2007年第2期55-57,共3页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50576079)

摘　　要：本研究中建立了以晶体生长系统为基础的数学物理模型,该模型为一个长高比为2∶1的方腔内的热对流,该热对流由两种驱动力引起,即浮力(由Grashof数来描述)与表面张力(由Marangoni数来描述)。大量的数值模拟显示,不同的Grashof数与Marangoni数组合产生不同的流动情况,且一个合适的表面张力能够抑制由浮力引起的热对流不稳定性。A physical and mathematical model based on the Czochlarski crystal growth system is designed. The model is used to simulate the thermal convection in a cavity of length to height being 2 to 1. The thermal convection is driven by two forces： buoyancy, described by Grashof number Gr, and surface tension, described by Marangoni number Ma. The numerical simulations show that various flow regimes occurred under various sets of Gr and Ma. It is predicted that the instability of thermal convection can be suppressed by proper surface tension.

关 键 词：热对流 Rayleigh/Marangoni 不稳定性 监视点 抑制 

分 类 号：TK123[动力工程及工程热物理—工程热物理]