Abstract
Owing to the transient nature of microchannel flow-boiling, gaining an in-depth understanding of the associated trends in time-averaged heat transfer variables as well as mechanisms of heat transfer is quite challenging. This work studies sub-cooled flow-boiling of de-ionized water in a microchannel. The micro-channel heights studied are 0.14, 0.28 and 0.42 mm while the tested mass fluxes range from 200 to 1000 kg/(m2s). Slug flow regime is observed under most of the tested conditions. Transient wetted surface heat flux and temperature as well as heat transfer coefficient are evaluated from the wall temperature data captured at a high data-logging frequency (synchronously with flow-visualizations). Heat transfer mechanisms as well as the trends observed in plots associated with time-averaged heat transfer variables are explained from the perspective of transient data correlated to the observed flow-boiling phenomena. Thin-film evaporation emerges as the prominent heat transfer mechanism. Two-way coupling between transient heat transfer variables and the boiling phenomena is evident.
Published Version
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