Abstract
This study numerically evaluates thermofluid flow characteristics in porous medium by a newly developed "modified two-phase mixture model" applying Ergun's law and a two-energy model instead of a 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 imposed heat conducts from a heating wall and further convective heat transfer is more active. The degree of thermal nonequilibriurn has a positive correlation with the increase in flow velocity and heat flux input. In the case of two-phase flow, the thermal nonequilibrium is remarkable in the two-phase region because the salid-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 modified two-phase mixture model is indispensable under the high heat flux conditions of over 1 MW/m2.
Original language | English |
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Article number | 012602 |
Journal | Journal of Heat Transfer |
Volume | 130 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2008 Jan 1 |
Keywords
- Modified two-phase mixture model
- Non-Darcy's law
- Phase change
- Porous media
- Two-energy model
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering