系统旋转对浅环形池内硅油热毛细对流影响的实验研究  

Experiment on Effect of System Rotation on Thermocapillary Convection of Silicone Oil in Shallow Annular Pool

作　　者：石万元[1,2] 王瑜[1] 

机构地区：[1]重庆大学动力工程学院,重庆400044 [2]重庆大学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》2013年第4期702-705,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.50976128;No.51176210);重庆市自然科学基金项目(No.CQ cstc2012jjA5003)

摘　　要：为了了解系统旋转对热毛细对流的影响,采用阴影法观察了外半径R_o=40 mm、内半径R_i=20mm、深度H=1mm,沿顺时针方向旋转的环形池内1cSt硅油热毛细对流的特征。测量了0～10r/min转速范围内发生热流体波的临界温差,观察了旋转对热流体波的影响,结果发现:当内外环间温差略低于临界温差时,靠近外环附近产生多圈同心圆环状静止波纹;超过临界温差后,静止液池内分布着两组沿周向传播方向相反的波纹;超过临界温差不远时热流体波的传播方向与液池的旋转方向相反,提高温差使其传播方向转变为与液池旋转方向相同;提高转速又使其传播方向转变为与液池旋转方向相反。The thermocapillary convection of silicone oil lcSt in a differentially heated shallow annular pool rotating along clockwise direction with inner radius R0 = 40 mm, outer radius Ri = 20 mm and depth H = 1 mm was investigated experimentally on-ground. The critical temperature differences ATe for the incipience of hydrothermal waves （HTW） as function of pool rotation rates from 0 to 10 r/min were measured. The characteristics of HTW in the rotating pools were observed by the shadowgraph method. When the temperature difference between the inner wall and the outer wall is slightly lower than the ATe, the steady multi cellular convection pattern occurs near the hot wall. When the temperature difference slightly exceeds the ATc, two groups of HTWs with opposite propagating direction coexist in the non-rotating pool. In the rotating pool, the HTW propagates in a direction opposite to that of pool rotation when the temperature difference is low whereas it propagates in a direction as same as that of pool rotation when the temperature difference is high. Increasing the rotation rate causes the HTW propagating in a direction opposite to that of pool rotation again.

关 键 词：热毛细对流 旋转 热流体波 硅油 

分 类 号：TK124[动力工程及工程热物理—工程热物理]