气体物理吸附对自由分子流中棱形尘埃的影响:静态研究

Hsin-Chen Yu, Xiaoping Zhang, Lei Wu, Zhongzhou Ren, Peishan He
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引用次数: 0

摘要

自然界和工业生产中普遍存在低压或微/纳米尺度的气固耦合系统。尽管气体散射模型已被广泛用于研究粉尘表面的这一问题,但在以往气体表面散射模型的应用中,气体物理吸附的考虑往往被忽视。因此,本研究旨在研究气体物理吸附在粉尘表面的分布,并评估其对非球形粉尘在自由分子流中所受静力的影响。本研究考虑了绕其小轴线旋转的棱形尘埃,并使用了内部直接模拟蒙特卡洛代码。研究结果表明,气体物理吸附作用会受到气体密度、马赫数和尘埃形状变化的影响。此外,气体物理吸附增强了低气压下表面光滑的尘埃的气尘耦合,这归因于气体分子在表面气体吸附部分的麦克斯韦漫散射比的增加。因此,气体物理吸附被认为是低气压下气尘耦合的一个潜在因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gas physisorption impact on prolate dust in free-molecule flows: A static study
Gas–solid coupling systems operating at low pressure or the micro/nanoscale generally exist in nature and industrial manufacture. Although the gas-scattering model has been widely used to study this problem on the dust surface, the consideration of gas physisorption was often neglected in previous applications of gas–surface scattering models. Therefore, this study aims to investigate the distribution of gas physisorption on the dust surface and assess its impact on the static force experienced by nonspherical dust in free-molecule flows. In this study, the prolate dust spinning around its minor axis is considered and the in-house direct simulation Monte Carlo code is used. Results show that gas physisorption on prolate dust is influenced by changes in gas number densities, Mach number, and dust shape. Furthermore, the gas physisorption enhances the gas–dust coupling for dust with a smooth surface at low gas pressure, attributed to the increasing ratio of Maxwell diffuse scattering of gas molecules on the gas-adsorbed part of the surface. Hence, gas physisorption was suggested as a potential factor for gas–dust coupling at low gas pressure.
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