Flow boiling experiments were conducted in mini- and microchannel with different ratio of heater width to a channel width. Decrease in critical heat flux is observed in transition from wide channel to channel with width equal to a heater width. Particularities of boiling phenomena in these conditions were observed by means of high-speed visualization, which provided an explanation to heat flux reduction.

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Investigation of subcooled nucleate boiling in minichannels was conducted with high speed recording optical system also equiped with high spatial resolution optics. Obtained data on the bubble dynamics is in good agreement with well-known correlations from the literature. The final stage of bubble dynamics is in good agreement with the Labuntsov correlation for spherical vapor bubble growth on a heated wall.

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