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为了了解重力水平对环形液池内热毛细-浮力对流耗散结构的影响,利用有限容积法进行了非稳态三维数值模拟,环形液池外壁被加热,内壁被冷却,流体为0.65cSt硅油,其Pr数为6.7。结果表明,在微重力条件下,流动为三维振荡流动;当重力水平增加到0.1go时,流动结构转化为沿周向运动的一组滚胞,其轴线与温度梯度方向一致;当重力水平增加到0.5go时,流型则为一组静止的滚胞;当重力水平继续增加到3go时,流动转变为稳定流动。
In order to understand the effect of gravity on the thermocapillary-buoyancy convective dissipative structure in a toroidal liquid pool, unsteady three-dimensional numerical simulations were performed using a finite volume method. The outer wall of the annular pool was heated and the inner wall was cooled. The fluid was 0.65 cSt silicone oil, The Pr number is 6.7. The results show that the flow is a three-dimensional oscillatory flow under microgravity. When the gravitational level increases to 0.1go, the flow structure transforms into a group of rolling cells moving in the circumferential direction with the same axial direction as the temperature gradient. When the gravity level increases At 0.5go, the flow pattern is a set of stationary rolling cells; when the gravity level continues to increase to 3go, the flow transitions to a steady flow.