Study of the heat flux density effect on the pressure drop of two-phase gas-liquid flows in a slit microchannel

The influence of heat flux density on the pressure drop of two-phase gas-liquid flows in a slit microchannel with local heating was experimentally studied at a fixed liquid mass velocity and varying mass velocities of gas. It was shown that at low gas mass velocities, the pressure drop increases due to increased interfacial interaction; at high gas mass velocities, it decreases due to intense evaporation, wall drying, and reduced liquid-wall friction. At moderate gas mass velocities, it remains virtually unchanged due to the mutual compensation of two opposing effects: increased interfacial interaction and reduced liquid-wall friction.