Effect of acceleration by internal and external force fields on particle motion in intermediate regimes between the hydrodynamic and free-molecular limits

S. D. Shandakov, A. G. Nasibulin, Yu I. Polygalov, E. Yu Samchinskiǐ, E. I. Kauppinen

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1 Citation (Scopus)

Abstract

The kinetic theory of gases is applied to analyze slow translational motion of low-concentration particles driven by an external force in a homogeneous gas. The analysis takes into account the diffusion due to the difference in acceleration between particles and molecules in internal and external force fields. A general expression is derived for the particle drag force in hydrodynamic, free-molecular, and intermediate regimes. This expression reduces to a simple relation between the drag force and its values in the hydrodynamic and free-molecular limits and the force of intermolecular interaction between particles and gas molecules. In the case of spherically symmetric potential of interaction between the particle and molecules, the drag force is the harmonic mean of its limit values.

Original languageEnglish
Pages (from-to)1147-1152
Number of pages6
JournalJournal of Experimental and Theoretical Physics
Volume101
Issue number6
DOIs
Publication statusPublished - 2005
Externally publishedYes

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