The onset of nucleate boiling in the flow of water through a microchannel heat sink was investigated. The microchannels considered were 275 lm wide by 636 lm 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.


Microchannels; Electronics cooling; Boiling; Incipience; High heat flux; Heat sink

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D. Liu, P.S. Lee, and S. V. Garimella, “Prediction of the Onset of Nucleate Boiling in Microchannel Flow,” International Journal of Heat and Mass Transfer, Vol. 48, pp. 5134-5149, 2005.