顺抗磁性混合气体在梯度磁场中流动的蒙特卡罗直接模拟

Monte-Carlo direct simulation of paramagnetic and diamagnetic mixed gas flows in gradient magnetic fields

以氧气和氮气的混合气体为研究对象,运用蒙特卡罗直接模拟方法模拟了顺抗磁性混合气体在高梯度磁场中的流动情况,并把模拟计算结果与已有的实验结果之间进行了对比分析．模拟结果表明:磁场强度与梯度乘积由100T2·m-1增加到1000 T2·m-1时,氧体积分数增量由 0．12％增加到1．89％;混合气体温度由283 K升高到333 K时,氧体积分数增量由0．4％减小到 0．1％;混合气体中氧气的初始体积分数由20％增加到30％时,氧体积分数增量由0．12％增加到 0．59％;压力的变化对氧体积分数的变化几乎没有影响．

With a mixture of oxygen and nitrogen as the subject investigated, the direct simulation Monte-Carlo method was applied to simulate the flow of paramagnetic and diamagnetic mixed gas in high gradient magnetic fields. The simulated results were compared with the existing experimental ones, and the reliability of the program was demonstrated. It was shown that the increment of oxygen concentration increased from 0.12% to 1.89% when the product of magnetic field and gradient varied from 100T^2·m^-1 to 1 000 T^2·m^-1. The increment of oxygen concentration reduced from 0.4 % to 0.1% when the temperature varied from 273 K to 333 K. The increment rose from 0.12 % to 0.59 % when the initial oxygen concentration varied from 20 96 to 30 %. The change in pressure did not almost influence the oxygen concentration.