Magnetohydrodynamic study of electromagnetic separation of nonmetallic inclusions from aluminum melt  

作　　者：疏达 孙宝德 王俊 张雪萍 周尧和 

出　　处：《Science China(Technological Sciences)》2002年第4期417-425,共9页中国科学（技术科学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 59871029) and the National Key Fundamental Research Project (973) (No. G1999064900-4).

摘　　要：Magnetohydrodynamic flow around the nonmetallic inclusions in aluminum melt and the force exerted on the inclusions were explored by dimensional analysis and numerical calculations. Dimensional analysis shows that the invariant _f^2 A = {{JB\rho _f d_p^3 } \over {\mu _f^2 }} characterizes the force exerted on the inclusions and the flow intensity of the melt. The physical significance of A is represented as a modified particle Reynolds number that reflects the effects of electromagnetic force. The fluid flow around the particle becomes unstable when A>2×103. It is shown that the neglect of the inertial terms has little effect on the force exerted on the inclusions in the range of A≤1×106. However, the analytical solution of the maximum velocity inside the melt does not apply due to the appearance of turbulent flow in the case of A>2×103.

关 键 词：aluminum  inclusions  ELECTROMAGNETIC separation  magnetohydrodynamics. 

分 类 号：TG292[金属学及工艺—铸造]