Density-dependent drag coefficient for gas-adsorbed particles in free-molecule flows
Density-dependent drag coefficient for gas-adsorbed particles in free-molecule flows
复制标题
自由分子流中气体吸附颗粒的密度相关阻力系数
DOI：
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
T. Ingold
中科院分区：
文献类型：
--
作者：
T. Ingold
Yu等人最近研究了气体-颗粒流中球形颗粒的气体吸附[“Direct simulation Monte Carlo of the gas adsorption of particles in gas-particle flows，”Phys. Fluids 34，083302（2022）]。然而，迄今为止，颗粒表面上的气体吸附分布仍然未知。本文通过引入一种数值方法来计算气固两相流中椭球颗粒的气体吸附分布，解决了这一知识空白。我们将颗粒表面分成内部平板，并计算气流中每个内部平板的气体吸附。在此基础上，采用直接模拟蒙特卡罗方法，对椭球粒子的气体吸附分布进行了重建。结果表明，随着颗粒温度的升高，颗粒偏心率增大时，颗粒的平均吸附量发生逆转。此外，我们表明，在自由分子流中的颗粒运动的密度相关的阻力系数可能表明在颗粒表面的气体吸附。这些观点可能会激发稀薄气体空间中尘埃物理的研究。
Gas adsorption by the spherical particles in gas–particle flows has been recently studied by Yu et al. [“Direct simulation Monte Carlo of the gas adsorption of particles in gas–particle flows,” Phys. Fluids 34, 083302 (2022)]. However, the gas-adsorption distribution on the particle surface has heretofore remained unknown. This paper addresses this knowledge gap by introducing a numerical method to calculate the gas-adsorption distribution for ellipsoidal particles in gas–particle flows. We split the particle surface into internal flat plates and calculate the gas adsorption for each internal flat plate in the gas flow. Based on this numerical method, the gas adsorption distribution for the ellipsoidal particles is reconstructed by using the direct simulation Monte Carlo method. The results show that the average adsorption by prolate particles with particle eccentricity reverses as the particle temperature increases. Moreover, we show that the density-dependent drag coefficient for particle motion in the free-molecule flow may evince gas adsorption at the particle surface. Those points could inspire the studies of dust physics in rarefied gas spaces.
DOI：
10.1002/jbm.b.30097
发表时间：
2004-11-15
影响因子：
3.4
作者：
Zhang, Y;Lawn, BR;Thompson, VP
通讯作者：
Thompson, VP