磁场对水平温度梯度下双层流体热对流的影响

在水平温度梯度下,双层流体交界面的表面张力会出现梯度,驱动热毛细对流运动,造成热剪切层内的扰动.本文数值模拟了不同重力条件下,双层流体内的对流现象,得出了在微重力时,对流运动将引起热剪切层内强烈的扰动.为了减弱这种扰动,我们利用磁场对流体的运动进行控制.为此,又对微重力条件下,不同方向应用磁场下的热剪切层内扰动行为进行了数值研究,结果显示,磁场对热剪切层稳定性有促进作用,加入法向的应用磁场最为有效.

THE EFFECT OF MAGNETIC FIELDS ON THE THERMAL CONVECTION OF TWO LAYERS FLUIDS UNDER HORIZONTAL TEMPERATURE GRADIENTS

A horizontal temperature gradient in the liquid/liquid interface results in a gradient of surface tension.The thermocapiUary convection caused by the surface tension gradient induces a local perturbation in shear layer.In this paper,the behaviors of thermocapillary convection were numerically simulated under the different gravity and what were concluded the strong disturbance occurred in the shear layer due to the thermocapiUary convection under microgravity.The magnetic fields were applied to control the motion of the fluid for increasing the interface stability and the effects of application magnetic fields on the shear layer stability under microgravity were analyzed numerically and the conclusions were that the magnetic field would attenuate the perturbation in the thermal shear layer and the impact of normal field for stability was best.