玻色气体节流过程的参量变化分析

Parameters Changing Analysis of Bose Gas with Throttling Process

考虑弱简并和分子间相互作用引起系统的内能变化,导出弱简并非理想玻色气体的内能、配分函数和物态方程,再根据相关的热力学关系,推导出了系统的焦-汤系数.结果显示:弱简并非理想玻色气体系统的焦-汤系数要受到分子相互作用和系统的量子简并程度影响.若系统分子间相互作用表现为排斥作用,经节流后,系统温度变化的方向以及临界状态都要受到分子相互作用大小和简并强度的影响;若系统分子间相互作用表现为吸引作用,经过节流过程后,系统温度的变化存在极限值,不能通过节流的方法使系统温度的改变达到该极限值.

Considering the＇changes of internal energy caused by weak degeneracy and interaction between molecules, the internal energy of weak degenerate non - ideal Bose gas, partition function and equation of state were brought out. Using the results and relevant thermodynamic relations, Joule -Thomson coefficient was deduced. The results show that the Joule - Thomson coefficient of weak degenerate non - ideal Bose gas system is influenced by weak degeneracy and interaction between molecules. If it＇ s a repulsive system, after throttling process, not only the change direction of the system temperature is influenced by weak degeneracy and interaction between molecular, enced by them. If it＇ s an attractive limit, it＇s impossible to reach this but also the critical state of the temperature changing direction is influ- system, after throttling process, change of the system temperature has a limit temperature by throttling process.