VISCOSITY OF A BINARY FLUID IN NARROW SLOT-LIKE PORES

Yu. K. Tovbin, E. E. Gvozdeva, and L. K. Zhidkova

UDC 533.7 + 541.183

The concentration dependences of the shear-viscosity coefficient 
of a fluid, representing a binary mixture of components with molecules 
of approximately equal sizes, in narrow slot-like pores filled to 
a different degree (from a rarefied gas to a liquid) have been theoretically 
investigated with the use of a lattice-gas model accounting for the 
characteristic volume of atoms and interactions between them in the 
quasichemical approximation. This model allows one to determine the 
self-consistent equilibrium characteristics of a vapor-liquid system 
and the shear-viscosity coefficients of molecules with the use of 
a unique set of energy parameters. The influence of the activation 
energy of the surface migration of molecules on the local coefficients 
of viscosity has been considered. A molecular interpretation of the 
sliding friction of a fluid near the walls of pores has been given; 
this effect was explained by the surface migration of the mixture 
components.

L. Ya. Karpov Physicochemical Scientific-Research Institute, 
10 Vorontsovo Pole Str., Moscow, 105064, Russia; email: tovbin@cc.nifhi.ac.ru. 
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, No. 1, pp. 
121-132, January-February, 2006. Original article submitted 
October 13, 2004.