Flow Structure and Surface Deformation of High Prandtl Number Fluid Under Reduced Gravity and Microgravity
Flow Structure and Surface Deformation of High Prandtl Number Fluid Under Reduced Gravity and Microgravity
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DOI：
10.1007/s12217-011-9278-1
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发表时间：
2011-08
影响因子：
1.8
通讯作者：
Ruquan Liang;G. Duan;Fusheng Yan;Jun-hong Ji;M. Kawaji
中科院分区：
文献类型：
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作者：
Ruquan Liang;G. Duan;Fusheng Yan;Jun-hong Ji;M. Kawaji
对高普朗特数流体在失重和微重力条件下的流动结构和表面变形进行了数值模拟。在交错网格上求解Navier-Stokes方程和能量守恒方程，并采用质量守恒水平集方法捕捉液桥的自由表面变形。研究了重力减小和热毛细对流对液桥表面变形的影响，结果表明：液桥表面水平振动幅值逐渐减小，液桥内部热毛细对流在初始阶段后开始转入稳态；此外，还研究了水平外加加速度和零重力作用下液桥内循环流动中心的移动，结果表明：液桥内的涡中心首先向冷盘移动并达到平衡位置，然后在平衡位置周围周期性地振动。
The numerical simulation has been conducted to investigate the flow structure and surface deformation in a liquid bridge of high Prandtl number fluid under reduced gravity and microgravity. The Navier–Stokes equations coupled with the energy conservation equation are solved on a staggered grid, and the mass conserving level set approach is used to capture the free surface deformation of the liquid bridge. The effect of reduced gravity and thermocapillary convection on the surface deformation of the liquid bridge is investigated, and the results show that the amplitude of the surface horizontal vibration decreases gradually, and the thermocapillary convection inside the liquid bridge starts to turn into a steady state after the initial period. Moreover, the shift of the center of the recirculating flow inside the liquid bridge under horizontal external acceleration and zero gravity is also studied, and the results indicate that the vortex centers move initially toward the cold disk and reach an equilibrium position, and then the vortex centers vibrate around the equilibrium position periodically.