The small hydraulic diameters employed during ow boiling in compact evaporator passages are becoming more important in diverse applications including electronics cooling and fuel cell evaporators. The high pressure drop characteristics of these passages are particularly important as they alter the ow and heat transfer, especially in parallel multichannel con gurations. The pressure drop oscillations often introduce dryout in some passages while their neighboring passages operate under

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... se mode. This article presents a comprehensive review of literature on evaporation in small-diameter passages along with some results obtained by the author for water evaporating in 1-mm-hydraulic-diameter multichannel passages. Critical heat ux is not covered in this article due to space constraints.