半浮区液桥热毛细对流速度场特征

VELOCITY FIELD OF THERMOCAPILLARY CONVECTION IN LIQUID BRIDGE OF HALF FLOATING ZONE

摘要

摘要:液桥流场的速度分布是液桥表面张力梯度驱动对流的一个重要研究内容。通过地面模拟微重力环境的液桥实验以及数值计算,研究了外加温差、液桥腰径等对流场速度分布的影响,实验结果与数值计算结果相当符合。结果还表明,当液桥腰径减小时,流场的结构发生了变化,涡心由一个转化成两个。

Abstract:The velocity distribution of flow field in liquid bridge is an important aspect in the thermocapillary convection driven by the gradient of free surface tension in liquid bridge. This paper presents the velocity variation for typical liquid bridge shape and applied temperature difference. The experiment results agree with the numerical simulating results. It is indicated that the vortex in the liquid bridge splits into two when the liquid bridge is slender enough.