半浮区热毛细对流的不稳定性与转捩

INSTABILITY AND TRANSIENT PROCESS OF THERMOCAPILLARY CONVECTION IN THE HALF FLOATING ZONE

近二十年来，微重力流体开展了半浮区液桥热毛细对流的不稳定性与转捩的研究．文中给出了热毛细振荡对流发生的临界参数，分析了液桥几何位形（尺度比，体积比）、物理参数及传热参数对临界Ｍａｘａｎｇｏｎｉ的影响．报导了有关的地面模拟实验，微重力实验以及本问题的线性稳定性分析、能量分析和数值模拟结果，并介绍了定常轴对称热毛细对流通过非定常振荡热毛细对流到湍流的转捩过程和三种热毛细振荡对流的产生机理．

The Instability and transient process of the thermocapillary convection in the halffloating zone have been investigated in recent 20 years. In the present paper, the critical parameters of the thermocapillary oscillatory convection are given, and the effects of geometric configuration (aspect ratio, volume ratio), physical parameters and heat-transfer parameter on thecritical Marangoni number are analyzed. The results obtained from the experiments, both on theground and under microgravity, and by the linear stability analysis, the energy analysis and thenumerical simulation are reported briefly. The transient process of thermocapillary convection fromthe steady axisymmetric convection via time-dependent thermocapillajry oscillatory convection toturbulence is introduced. Three kinds of the oscillation mechanisms are described in the presentpaper.