STUDY OF VISCOSITY INHOMOGENEITY IN POROUS-MEDIA

The theory of transport in highly inhomogeneous systems, developed rec ently by Pozhar and Gubbins, and the nonequilibrium molecular dynamics (NEMD) technique are employed to study the viscosity of WCA fluids co fined in narrow slit pores of width 5.1 and 20 sigma at reduced densit ies rho sigma(3) of 0.422-0.713. Calculated quantities include the equ ilibrium and nonequilibrium density profiles, equilibrium pair correla tion functions, how velocity profiles, and the viscosity profiles. NEM D simulation results are compared with the theoretical predictions. Th e agreement is good except for the region within one molecular diamete r from the walls. The viscosity was found to vary with position across the pore. (C) 1997 American Institute of Physics.