Heat transfer in a dense gas between two parallel plates
Heat transfer in a dense gas between two parallel plates
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稠密气体在两个平行板之间的传热
DOI：
10.1063/5.0091390
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发表时间：
2022
期刊：
影响因子：
1.6
通讯作者：
and Shigeru Takata
中科院分区：
文献类型：
--
作者：
Masanari Hattori;Soichi Tanaka;and Shigeru Takata
基于漫反射边界条件下的Enskog方程，数值研究了稠密气体在两平行平板间的时变传热问题。为了有效地计算Enskog方程的碰撞项，采用有限差分格式与傅里叶谱方法相结合进行数值计算。其结果是，宏观量的气体，如热通量和温度，获得不同的努森数和比的分子直径板之间的距离。与理想气体的情况相比，由于分子的有限尺寸的影响，不仅小，而且中间努森数的热通量在稳态增强。结果表明，在初始阶段，特别是小努森数的有限尺寸效应也会影响扰动的传播。
Time-dependent heat transfer in a dense gas between two parallel plates, which is initiated by an abrupt change in temperature of one plate, is numerically investigated on the basis of the Enskog equation under the diffuse reflection boundary condition. Numerical computation is carried out by a finite-difference scheme combined with the Fourier spectral method for the efficient computation of the collision term of the Enskog equation. As a result, macroscopic quantities of the gas, such as heat flux and temperature, are obtained for various Knudsen numbers and ratios of the molecular diameter to the distance between plates. Compared to the case of an ideal gas, the heat flux in the stationary state is enhanced due to an effect of the finite size of molecules for not only small but also intermediate Knudsen numbers. The results imply that the finite-size effect also affects the propagation of disturbances in the initial stage, particularly for small Knudsen numbers.
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