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 level on the flow pattern of thermocapillary- buoyant convection in an annular pool, a series of unsteady three-dimensional numerical simulations were carried out with finite-volume method. The pool was filled with the 0.65cSt silicone oil （Prandtl number Pr----6.7）, and heated from the outer cylindrical wall and cooled at the inner wall. The simulation results show that the three-dimensional oscillatory flow appeared at micro-gravity. When g=O.lgo, the flow pattern transits extended roll cells travelling in the azimuthal direction. If the gravity level increases to 0.Sgo, the stable three-dimensional flow happened. Further, at g=3.0go, the thermocapillary-buoyant convection transits the steady axially symmetric flow.
参考文献
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