金属电阻率模型

Electrical resistivity model for metals

修正了Burgess电阻率模型中的错误公式和算法流程,获得了与文献中结果完全相同的电阻率曲线。采用Burgess电阻率对Z装置上的磁驱动飞片实验进行数值模拟,计算的自由面速度曲线与实验结果相差较大。由于液体到达汽化点时,是气液混合体,因此从汽化点到临界温度的Burgess电阻率公式不应采用气体计算公式,应改为气液混合体的计算公式。采用从汽化点到临界温度阶段修改为气液混合体的电阻率公式进行数值模拟,计算的自由面速度曲线与实验结果、文献计算结果相吻合。

We modify the inaccurate formulas used in Burgess＇s resistivity model（BRM） and his algorithm flow,and calculate the electrical resistivity of the metals aluminum,copper,tungsten,stainless steel,gold and silver.The calculated results are consistent with the ones by Burgess.A magneto-hydrodynamic model is proposed to simulate the magnetically-accelerated flyer plate experiment performed on the Z machine at Sandia National Laboratories.The computed free-surface velocities of the flyer plates with BRM do not agree well with the experimental records by VISAR.As the liquid reaches the vaporization point,the liquid becomes the gas-liquid mixture,so the gas-liquid mixture resistivity model（GLMRM） should be used in the temperature range from the vaporization point to the critical temperature and the gas phase resistivity model is not appropriate in this temperature region.The simulated free-surface velocities of the flyer plate with GLMRM coincide with the experimental results and the simulation results by ALEGRA code.