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已有实验表明,气体在纳米孔内流动时其流动摩擦阻力系数远小于经典流体力学所给出的理论值。气体的黏性系数对其在纳米孔内流动时摩擦阻力大小起着重要作用,对其开展研究有助于理解气体在纳米尺度下表现出来的超流现象。本文采用分子动力学模拟方法对氩气在纳米孔内流动时的黏性系数进行研究。研究了氩气在纳米孔内表现出的平均黏性系数与纳米孔大小及气固间作用强弱的关系,及其随气体温度和压强的变化关系。对氩气黏性系数在纳米孔内的分布研究表明黏性系数在纳米孔内不为常数,而是表现出一定的分布规律,此现象为纳米孔内气体黏性系数与大空间下气体黏性系数最大的区别。本文的研究结果对人们理解气体在纳米孔内表现出超流现象有一定的帮助。
Experiments have shown that the flow friction coefficient of gas flowing in the nanopore is much smaller than the theoretical value given by classical hydrodynamics. The viscous coefficient of gas plays an important role in the frictional resistance when it flows in the nanopore. It is helpful to understand the superfluid phenomenon of gas in nanometer scale. In this paper, molecular dynamics simulation was used to study the viscous coefficient of argon flow in the nanopore. The relationship between the average viscous coefficient of Ar gas in the nanopore and the size of the nanopore and the interaction between the gas and the gas, and the relationship between the viscosity and the gas temperature and pressure were studied. The study on the distribution of the viscous coefficient of argon in the nanopore shows that the viscous coefficient is not constant in the nanopore, but shows a certain distribution. The phenomenon is that the viscous coefficient of gas in the nanopore and the viscosity of the gas in the large space The biggest difference between the sex coefficient. The results of this paper will help to understand the phenomenon of superfluid in the nanopore.