This study numerically evaluates thermofluid flow characteristics in porous media by a newly developed “modified two-phase mixture model” applying a two-energy model instead of an one-energy model. In a single-phase flow case, thermal nonequilibrium between a solid phase and a fluid phase is observed in the area where inlet heat conducts from a heating wall and further convective heat transfer is more active. Though the degree of thermal nonequilibrium has a positive correlation with the increase in flow velocity and inlet heat flux, the degree is very low and can be ignored, from an engineering perspective. In a case of two-phase flow, the thermal nonequilibrium is remarkable in the two-phase region because the solid-phase temperature in this region is far beyond saturation temperature. A difference between these two models is obvious especially in the two-phase flow case, so that the numerical simulation with the two-energy model is indispensable under the high heat flux conditions of over 1MW/m2.
- Heat Transfer Division and Electronic and Photonic Packaging Division
Numerical Investigation of Thermofluid Flow Characteristics With Phase Change Against High Heat Flux in Porous Media
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Yuki, K, Abei, J, Hashizume, H, & Toda, S. "Numerical Investigation of Thermofluid Flow Characteristics With Phase Change Against High Heat Flux in Porous Media." Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. Heat Transfer: Volume 2. San Francisco, California, USA. July 17–22, 2005. pp. 409-419. ASME. https://doi.org/10.1115/HT2005-72281
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