【作者】 商奇伟； 李友荣； 彭岚； 吴双应；

【Author】 SHANG Qi-wei, LI You-rong, PENG Lan, WU Shuang-ying (College of Power Engineering, Chongqing University, Chongqing 400044, China)

【机构】 重庆大学动力工程学院；

【摘要】 为了了解水平温度梯度作用时环形浅液池内的热毛细-浮力对流特性,利用有限容积法进行了非稳态二维数值模拟,环形液池外壁被加热,半径为40mm,内壁被冷却,半径为20mm,液池深度为0.75-3mm,液池内的流体为0.65cSt的硅油,其Pr数为6.7。模拟结果表明,当水平温度梯度较小时,流动为稳态流动,随着温度梯度的增加,流动将会失去其稳定性,转化成各种振荡流动,模拟计算的临界温差与实验结果吻合较好。更多还原

【Abstract】 In order to understand the nature of thermocapillary-buoyancy convection in a differentially heated annular pool with the outer heated cylinder and the inner cooled cylinder, we conducted a series of unsteady two-dimensional numerical simulations with the finite-volume method. The pool was filled with the 0.65cSt silicone oil (Prandtl number Pr=6.7). Results show that the flow is stable at the small temperature difference in the radial direction. With the increasing of the temperature difference, the simulation can predict oscillatory flows. It is found that there is a good agreement between the simulation and experiment results on the critical temperature difference.更多还原