A mathematical model was established to predict the electric field distribution around a single discrete phase in two-phase system applied uniform electric field. The difference of the dielectric permittivities between the discrete phase and dielectric liquid was considered.The equipotential lines and electric field strength around the single discrete phase were obtained by solving the governing equation for electric field. The numerical simulation results presented are in good agreement with theoretical analysis.

Two-dimensional magnetohydrodynamic behaviour of the plasma in co-axis of the plasma focus eguipment is studied in this paper. The two-step Lax-Wendroff scheme is applied to Eulerian cells of (r-z) plane in axial deuices. Applied special treatments are as follows. The complex diffusion terms have been treated by the forward time-defference method; The ion-electron equipartition terms are solved by a implicit iteration; The hapidus three-order smooth technics is used in all MHD equations; The mixed schame of Lax and Leapfrog schemes is used in the density equation and the momentum equation to eliminate the nonliear instabilities; The magneticfield of low-density region is treated as vacuum magnetic field, so that the calculations of magnetic field and fluids are decoupled,and the severe restriction in choosing the timestep is avoided.Each time-step of calculation takes 39 sec.on a DJS-8 (320), and approximately 370 timesteps are needed altogether. The steady dynamic structure is calculated.