Enhancement of heat transfer due to bubbles passing through a narrow vertical rectangular channel

Abstract A theoretical analysis has been made of heat transfer enhancement due to bubbles passing through a narrow vertical channel. The mechanism of enhancement for a constant heat flux is: heat is first transported by a latent heat of evaporation on the bubble interface covering the heated surface and is followed by sensible heating of the succeeding liquid. The latent heat transport is calculated using an integral method and the sensible heating is determined exactly. For low heat fluxes, the calculated heat transfer coefficients are in fairly good agreement with the experiments; at high heat fluxes, however, the calculated values are approximately half the experimental values, since flow along the heated surface is not taken into account.