Forced convective flow boiling in microchannels is characterized by the nucleation and rapid growth of vapor bubbles in confined geometries. Confined boiling flows are highly transient yielding periods of rapid vapor formation followed by a refilling of the channel with liquid. This behavior in a single microchannel with constant flow rates can only be correlated with the growth of single bubbles in the channel. Using a one-dimensional Lagrangrian-Eulerian model, Fogg and Goodson [1] showed that reflections of these pressure waves create local pressure depressions that may trigger nucleation at temperatures not predicted by incompressible analysis. This study extends the work of Fogg and Goodson [1] by examining the influence of channel and chip geometry on the propagation of pressure perturbations within microchannels. A set of equations are proposed to estimate the amplitude of the initial pulse and its evolution through various geometries such as converging/diverging channels and sudden expansions/contractions. Simulations of two single channel experimental structures show that the flow delivery condition plays a minimal role in the reflection and propagation of pressure perturbations and that channel design may impact the nucleation characteristics of microchannels.

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