EFFECT OF MASS ON SHEAR VISCOSITY OF BINARY FLUID MIXTURE CONFINED TO NANOCHANNELS

Abstract

Flow of fluid in nanochannel has been studied by evaluating transverse stress auto-correlation function and shear viscosity of the Ar–Kr and isotopic fluid mixture interacting via Lennard Jones potential. The enhancement in viscosity due to confinement has been investigated for different mass ratios and concentration of one of the fluids in a binary fluid mixture. It has been found that at a given number density and temperature, mixing fluid of lower molar weight reduces the enhancement in viscosity and also lower the chances of freezing of liquid near the walls. We have also studied the effect of concentration of two species on the viscosity. It is found that the enhancement in viscosity is less when the concentration of particles with lighter mass increases.