Dewetting acceleration by evaporation

Dewetting of a substrate, i.e. the liquid film retraction under partial wetting conditions, has been studied extensively over past decades. This theoretical work deals with dewetting phenomenon in presence evaporation into pure vapour atmosphere driven by substrate superheating respect to saturation temperature corresponding pressure. The dynamic profile vapour–liquid interface is analysed numerically using generalised lubrication approximation that can be applied an slope larger than its conventional counterpart. uses phenomenological argument increase precision calculations. For small slopes, it reduces approach. Several nanoscale effects are included theory obtain more precise results: Kelvin effect, hydrodynamic slip, Marangoni recoil and interfacial thermal resistance. Their relative importance discussed. results include shape evolution, apparent contact angle line speed, all defined properties. These dependencies agree existing experimental results. It found accelerated evaporation. numerical compared those multiscale two main parameters, Voinov (the obtained within microregion problem) length. latter for several fluids as function superheating, approximate expression proposed. A good agreement between numerics shows validity latter. means speed calculated analytical requires only input. Such important many applications, instance, bubble growth boiling or dynamics heat pipes.