The evaluation of the thermal-hydraulic performance of the two-phase microchannel heat sinks in the miniature thermal management systems has attracted great attention in recent years. Many numerical models were established and improved to study the flow boiling in single or parallel microchannels. The present paper proposes a mixture porous media model augmented by full-flow-regime-based closure models for water boiling in parallel rectangular microchannels. The new model is validated against a self-designed experiment. The mean relative errors (MREs) of the simulated average wall superheat and frictional pressure drop are 31.2% and  13.8%, respectively. The new model is both time-saving and accurate, and shows great potential in the design and optimization of the two-phase microchannel heat sinks.

Frictional pressure drop, Numerical model, Rectangular microchannel, Two-phase, Wall super heat