I. M. Kurchatov, N. I. Laguntsov, V. N. Tronin, “Mechanism of the anisotropic distribution of molecules freely moving in a channel with rough walls”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2010, Volume 36, Issue 2,Pages <nobr>39

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Mechanism of the anisotropic distribution of molecules freely moving in a channel with rough walls

I. M. Kurchatov^ab, N. I. Laguntsov^ab, V. N. Tronin^ab

^a National Engineering Physics Institute "MEPhI", Moscow
^b Aquaservis Company, Moscow, 115409, Russia

Abstract: A mechanism of the anisotropic distribution of molecules with respect to their directions of motion in a channel with rough walls is proposed. Based on a solution of the kinetic equation with a model collision integral and with allowance for the multiple scattering of gas molecules from the rough channel walls, it is shown that a flow driven by pressure gradient is governed by the Fick’s law with an effective diffusion coefficient determined by the geometry of surface inhomogeneities.

Received: 19.08.2009