ACCOMMODATION TWO-MOMENT BOUNDARY CONDITIONS 
IN PROBLEMS OF THERMAL AND ISOTHERMAL SLIP
A. V. Latyshev and A. A. Yushkanov

UDC 533.72

A new model of boundary conditions which generalizes 
the known Cercignani boundary condition is suggested. In this model, 
both the coefficient of accommodation of the tangential pulse of molecules 
and the coefficient of accommodation of the next moment of the distribution 
function are taken into account. The model is capable of approximating 
the mirror-diffuse boundary condition for the problems of slip with 
an accuracy of 1% and allows for the possibility of accommodation 
of different moments occurring differently on the surface. This possibility 
is absent in both the mirror-diffuse boundary condition and the Cercignani 
condition.

Moscow Pedagogical Institute, Russia; email: latyshev@orc.ru. 
Translated from Inzhenerno-Fizicheskii Zhurnal, vol. 74, No. 3, pp. 
63-69, May-June, 2001. Original article submitted February 17, 2000; 
revision submitted September 29, 2000.

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