Knudsen heat capacity
Knudsen heat capacity
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DOI：
10.1063/1.4872335
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发表时间：
2014-05
影响因子：
4.6
通讯作者：
G. Babac;J. Reese
中科院分区：
文献类型：
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作者：
G. Babac;J. Reese
我们提出了一个“努森热容”作为一个更合适的和有用的流体性质在微/纳米气体系统比恒压热容。在这些尺度上，不同的流体过程脱颖而出，通常不会在宏观尺度上观察到。对于包括这些努森过程的热力学分析，使用努森热容可以更有效和物理。我们从理论上计算了非理想单原子和双原子气体的热容，特别是氦、氮和氢。还考虑了帕拉和邻位氢的量子修饰。我们数值模拟的克努森热容量使用分子动力学模拟所考虑的气体，并比较这些结果与理论。
We present a “Knudsen heat capacity” as a more appropriate and useful fluid property in micro/nanoscale gas systems than the constant pressure heat capacity. At these scales, different fluid processes come to the fore that are not normally observed at the macroscale. For thermodynamic analyses that include these Knudsen processes, using the Knudsen heat capacity can be more effective and physical. We calculate this heat capacity theoretically for non-ideal monatomic and diatomic gases, in particular, helium, nitrogen, and hydrogen. The quantum modification for para and ortho hydrogen is also considered. We numerically model the Knudsen heat capacity using molecular dynamics simulations for the considered gases, and compare these results with the theoretical ones.