Surface effects on nanoscale Poiseuille flows under large driving force
In this work, we examine the effects of fluid-wall interaction on the fluid flux of nanoscale Poiseuille flows under large external driving force. The mass fluxes of liquid Ar and He confined by two parallel planar walls are measured by molecular dynamics simulations. For liquid Ar, a bimodal behavior in the flux is observed as the effective surface effect is varied. However, the bimodal behavior for Ar is not observed for He. At weak fluid-wall interactions, the flux of He is independent of fluid-wall binding energy, while it decreases monotonously with increasing fluid-wall binding energy when the fluid-wall interaction is strong.