Slip over nano-structured surfaces & nano gaseous films: Insight from molecular simulations

Par Srinivasa Ramisetti, University of Leeds (UK)

Mardi 17 Juillet, 14h00, Salle des séminaires (215), 2ème étage, Bâtiment A4N

Abstract :

In this talk, I will first present non-equilibrium molecular dynamics (NEMD) simulations to characterize the liquid flow over different nano-structured surfaces. I will discuss the role of liquid-gas coverage in determining surface slip properties. In the second part of my talk, I will present the slip gas-cushion model (slip-GCM) that we recently developed to estimate the apparent slip of liquid flowing over a gas film, which manifest rarefied gas effects. Our slip-GCM enables to calculate an effective hydrodynamic slip length given the gas film thickness, Knudsen number and bulk fluid viscosity. I will present results showing a good agreement between our slip-GCM and NEMD simulations of shear-driven liquid flow over a gas nanofilm covering a solid surface.