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Prediction of the onset of nucleate boiling in microchannel flow. (English) Zbl 1188.76261
Summary: The onset of nucleate boiling in the flow of water through a microchannel heat sink was investigated. The microchannels considered were \(275 \mu \)m wide by \(636 \mu \)m deep. Onset of nucleate boiling was identified with a high-speed imaging system and the heat flux at incipience was measured under various flow conditions. An analytical model was developed to predict the incipient heat flux as well as the bubble size at the onset of boiling. The closed-form solution obtained sheds light on the impact of the important system parameters on the incipient heat flux. The model predictions yield good agreement with the experimental data.

MSC:
76T10 Liquid-gas two-phase flows, bubbly flows
80A22 Stefan problems, phase changes, etc.
80A20 Heat and mass transfer, heat flow (MSC2010)
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