【摘要】 为了了解微重力下液封液桥内热毛细对流的基本特性,利用有限差分法进行了非稳态三维数值模拟,液桥高为(1-3)mm,直径为2mm和3 mm,液封外直径为(4-7)mm。模拟结果表明,当Marangoni数较小时,液封液桥内的热毛细对流为稳定的轴对称运动,当Marangoni数超过某一临界值后,流动将转化为三维振荡流动;为此,确定了发生振荡的临界Marangoni数,分析了各种条件下热毛细对流的振荡特性,计算了相应的振荡频率。更多还原

【Abstract】 In order to understand the fundamental characteristics of thermorcapillary convection in encapsulated liquid bridge, we conducted a series of unsteady three-dimensional numerical simulations of thermorcapillary convection in encapsulated liquid bridge with either 2 mm or 3 mm inner diameter and (4~7)mm outer diameter as well as variable height (1~3) mm. The simulation results indicate that thermorcapillary convection in encapsulated liquid bridge is axisymmetric and steady at the small Marangoni number. But when Maxangoni number exceeds some critical value, the flow will undergo a transition to three-dimensional oscillatory flow. The critical conditions for the onset oscillatory flow are determined. Details of the flow and temperature fields are discussed, and oscillation frequencies are also exhibited.更多还原