Recent experimental studies of evaporation in microchannels have shown that local flow-boiling coefficients are almost independent of vapor quality, weakly dependent on mass flux, moderately dependent on evaporating pressure, and strongly dependent on heat flux. In a conventional (macrochannel) geometry, such trends suggest nucleate boiling as the dominant heat transfer mechanism. In this paper, we put forward a simple new heat transfer model based on the hypothesis that thin-film evaporation into elongated bubbles is the important heat transfer mechanism in these flows. The new model predicts the above trends and quantitatively predicts flow-boiling coefficients for experimental data with several fluids. The success of this new model supports the idea that thin-film evaporation into elongated bubbles is the important heat transfer mechanism in microchannel evaporation. The model provides a new tool for the study of such flows, assists in understanding the heat transfer behavior, and provides a framework for predicting heat transfer.

Issue Section:
Evaporation, Boiling, and Condensation
Keywords:
heat transfer, bubbles, channel flow, evaporation, boiling, Evaporation, Heat Transfer, Phase Change, Two-Phase
Topics:
Evaporation, Flow (Dynamics), Heat transfer, Microchannels, Bubbles, Heat transfer coefficients, Vapors, Thin films, Heat flux, Nucleate boiling, Bubbly flow
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