Slip effect on shear-driven evaporating liquid film in microchannel

Abstract

The development of compact, advanced cooling technology leads to problems involving two-phase flows at micro-scales. We investigate the effect of slip on heated liquid film driven by its own vapor in microchannel. The macroscopic interface shape is found to be sensitive to slip length comparable with the initial film thickness. The slip at the wall tends to elongate the transition film, and can have an effect on the mass flow rate. Calculations reveal that the maximum of the slip velocity is located in the transition region. The present work is a part o Studies of such liquid films in microchannels propose accurate models of the transition regimes between macro- and micro-scales that capable of predicting formation of dry patches and heat transfer in the micro-region near contact line and hence, in the localized hot spots with very intensive evaporation. The deviation of the gas flow from the continuum hypothesis is measured by Knudsen number. However, the concept of the mean free path is not useful for the liquids, and is more relevant to the liquids slipping at the wall. A review of recent experimental, numerical and theoretical works on slip effect can be found in [6]. In the present work we investigate the slip effect on evaporating liquid film driven by its own vapor in microchannel. f the preparation of the SAFIR experiment of the European Space Agency onboard the International Space Station.