Viscosity of pure fluids—Enskog-2σ model

摘要: Abstract In this work, we propose a new kinetic theory model (Enskog-2σ model) to analyze and predict the viscosity of simple fluids. The is based on Enskog formulation makes use two effective diameters represent aspects molecular interactions in Enskog's treatment; namely, diameter representing excluded volume molecule accounting for increased probability collision comparison dilute gas. We have tested by analyzing five fluids (Ar, CH 4 , N 2 CO SF 6 ) increasing complexity at supercritical temperatures. Enskog-2σ outperforms previous approaches terms its correlative ability. demonstrate that associated with exhibits universal behaviour as function reduced temperature. conformal can be achieved means single fluid-dependent length scaling parameter. make finding develop general allows prediction one fluid from knowledge reference fluid, which work was chosen Ar. accuracy predicted depends way parameter estimated. If obtained along isotherm, similar uncertainty original correlation over entire range. value used estimate parameter, viscosities are maximum deviation 3.3%, 4.2%, 9.9% 10.5% respectively range validity model.