微重力下液封液桥内振荡热毛细对流的数值模拟  

Numerical simulation of oscillatory Marangoni flow in encapsulated liquid bridge

作　　者：彭岚[1] 李友荣[1] 曾丹苓[1] 

机构地区：[1]重庆大学动力工程学院,重庆400044

出　　处：《计算力学学报》2006年第5期577-582,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(50476042);重庆市自然科学基金(2004-8560);教育部留学回国人员科研启动基金(2005-383)资助项目

摘　　要：对微重力条件下液封液桥（流体采用KF-96硅油和FC-70氟化物，桥高1．4～4毫米，内层直径2或3毫米，外层直径5毫米）和单层液桥（流体采用KF-96硅油，桥高1～1．6毫米，直径2毫米）内的热毛细对流进行了数值模拟，模拟条件与Maiima等的实验条件相同。从理论上证实了大温差条件下将出现振荡热毛细对流，确定了发生振荡的临界条件并与相关实验结果进行了对比，同时还计算了振荡频率。The physical and mathematical models of the Marangoni convection of KF-96 silicone oil and FC-70 fluorinart in an encapsulated liquid bridge （or two immiscible coaxial liquid columns） with either 2 or 3mm inner diameter and 5mm outer diameter as well as variable height （1.4~4mm） heated from the top wall and cooled at the bottom wall with an adiabatic free surface were established. To contrast to this model, the Marangoni convection of KF-96 silicone oil in a liquid bridge with 2mm diameter and variable height （1-1.6mm） was also studied at present. We conducted a series of unsteady two-dimensional numerical simulations. Simulation conditions correspond to those in the experiments of MajiMa and Kawamura （2001）. The simulation results with large Marangoni number （Ma） predict oscillatory flows under microgravity. The critical conditions for the onset oscillatory flow are determined and compared with the experimental results. Details of the flow and temperature fields are discussed. Oscillation frequencies are also obtained from numerical simulation.

关 键 词：微重力 具有液封的液桥 振荡 热毛细对流 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]