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The effects of volume exclusion and long-range intermolecular attraction areinvestigated by the simplified kinetic model for surface-confined inhomogeneousfluids. Gas dynamics of the ideal gas, the hard-sphere fluid and the real gasare simulated by the Boltzmann equation, the Enskog equation and the simplekinetic equation, respectively. Only the Knudsen minimum appears for the idealgas, while both the Knudsen minimum and the Knudsen maximum occur for thehard-sphere fluid and the real gas under certain confinements, beyond which themaximum and minimum may disappear. The Boltzmann equation and the Enskogequation overestimates and underestimates the mass flow rate of the real gasdynamics under confinement, respectively, where the volume exclusion and thelong-range intermolecular attractive potential among molecules are notignorable. With the increase of the channel width, gas dynamics of thehard-sphere fluid and the real gas tends to the Boltzmann prediction gradually.The density inhomogeneity, which hinders the flow under confinement, is moreobvious when the solid fraction is larger. The anomalous slip occurs for realgas under constant confinement. The flow at a smaller Knudsen number (largersolid fraction or channel width) contributes more practical amount of masstransfer, although the rarefaction effects is more prominent at larger Knudsennumbers. The temperature has no effect on density and velocity profiles of theideal gas and the hard-sphere fluid, but the energy parameter among the realgas molecules decreases with the increasing temperature and the real gasdynamics tends to the hard-sphere ones consequently.

Non-ideal gas dynamics under confinement: rarefaction effect, dense effect and molecular interaction