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三维数值研究了环形液池内双层流体热毛细-浮力对流的流动特性,考察了液池深径比对流动的影响,其中外壁面维持高温,内壁面维持低温。结果显示,上、下层流体热毛细-浮力对流的流动结构依赖于液池深径比的大小,其内在机制是由浮力和热毛细对流相对强度所决定;随着深径比的减小,热毛细-浮力对流不稳定性的周向温度波数先增大后减小,存在发生流动不稳定性的最佳深径比;热毛细对流的振荡周期随着深径比的减小逐渐减小,而周向速度平均扰动幅度逐渐增大.
Three-dimensional numerical study of the flow characteristics of double-layer fluid thermocapillary-buoyant convection in a toroidal liquid pool was conducted. The effects of liquid depth-to-diameter ratio on the flow were investigated. The outer wall was maintained at high temperature while the inner wall was maintained at low temperature. The results show that the flow structure of the thermocapillary-buoyant convection in the upper and lower fluids depends on the depth-to-diameter ratio of the liquid pool. The intrinsic mechanism is determined by the relative intensities of the buoyancy and the thermal capillary convection. As the ratio of depth to diameter decreases, The circumferential temperature wavenumber of capillary-buoyancy convection instability first increases and then decreases, and the optimum depth-depth ratio of flow instability exists. The oscillation period of the thermocapillary convection decreases with the decrease of the depth-diameter ratio, While the average amplitude of the circumferential velocity gradually increased.