磁场作用下三维方腔内液态金属自然对流的数值模拟

Numerical simulation of natural convection of liquid metal in a cubic enclosure under magnetic field

为研究液态金属在磁场和壁面不同导电特性下的自然对流换热规律,对磁场作用下三维封闭方腔内的液态金属自然对流进行了数值模拟.研究表明:当没有外加磁场时,模拟结果与已有实验结果相符;当存在外加磁场时,三维方腔内的流动和换热出现较大变化.由于液态金属在磁场中运动产生感应电流,感应电流与外加磁场相互作用产生一个与运动方向相反的洛伦兹力,抑制了流动和液态金属的自然对流换热.通过绝缘边界和导电边界的研究结果对比表明,壁面导电性能对于磁流体流动和换热产生很大影响.

In order to study the liquid metal natural convection under the magnetic eld with different wall conductivity,the natural convection of liquid metal in the 3D cubic enclosure under the magnetic field is numerically simulated.Numerical simulations show that the results obtained without the magnetic field are in agreement with the existing experimental results.Because the induced current and reversed Lorenz force are produced by the liquid metal flowing in a magnetic field,and the reversed Lorenz force would inhibit the natural convection flow and heat transfer of liquid metal.With the increase of the intensity of magnetic field,inhibition of liquid metal natural convection by the reverse Lorentz force is obvious.Conductive wall has an important effect on the natural convection than insulation wall.