Effect of Dissolved Noncondensable on Hydrodynamics of Microchannels Subject to Liquid Forced Convection

摘要

The impact of the descroption of dissolved noncondensables on the hydrodynamics of heated, long microchannels subject to liquid forced convection is theoretically studied. A one-dimensional model, based on the solution of mass, momentum, energy and a noncondensable species mass conservation equations, is developed. Parametric calculations representing typical microchannel geoemtric and flwo conditions are then performed. It is shown that the desorption of noncondensables can lead to a gas-liquid two-phase flow and therefore enhance the fludi velocity in microchannels rather signficantly, with the enhancement becoming larer as the channel length to diameter ratio is increased. Desorption of the noncondensable and its accompanying evaporation, furthermore, may lead to choking.