Quantum Drag Forces on a Sphere Moving Through a Rarefied Gas

Details Quantum Drag Forces on a Sphere Moving Through a Rarefied Gas Quantum Drag Forces on a Sphere Moving Through a Rarefied Gas

2004-11-23

arxiv.org/abs/cond-mat/0411585v1

Physics

Condensed Matter

Other Condensed Matter

5 pages no figures

Scientific paper

10.1103/PhysRevE.71.051202

As an application of quantum fluid mechanics, we consider the drag force exerted on a sphere by an ultra-dilute gas. Quantum mechanical diffraction scattering theory enters in that regime wherein the mean free path of a molecule in the gas is large compared with the sphere radius. The drag force is computed in a model specified by the ``sticking fraction'' of events in which a gaseous molecule is adsorbed by the spherical surface. Classical inelastic scattering theory is shown to be inadequate for physically reasonable sticking fraction values. The quantum mechanical scattering drag force is exhibited theoretically and compared with experimental data.

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