The flow boiling process suffers from severe instabilities induced due to nucleation of vapor bubbles in a superheated liquid environment in a minichannel or a microchannel. In an effort to improve the flow boiling stability, several modifications are introduced and experiments are performed on 1054×197μm parallel rectangular microchannels (hydraulic diameter of 332μm⁠) with water as the working fluid. The cavity sizes and local liquid and wall conditions required at the onset of nucleation are analyzed. The effects of an inlet pressure restrictor and fabricated nucleation sites are evaluated as a means of stabilizing the flow boiling process and avoiding the backflow phenomenon. The results are compared with the unrestricted flow configurations in smooth channels.

Issue Section:
Micro/Nanoscale Heat Transfer
Keywords:
flow instability, boiling, microchannel flow, two-phase flow, nucleation, bubbles, boiling, channel flow, heat transfer, instability, microscale, stability, two-phase, visualization
Topics:
Boiling, Flow (Dynamics), Microchannels, Nucleation (Physics), Pressure drop, Bubbles, Cavities
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 by American Society of Mechanical Engineers
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