Numerical investigation of thermofluid flow characteristics with phase change against high heat flux in porous media

Kazuhisa Yuki, Jun Abei, Hidetoshi Hashizume, Saburo Toda

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

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 languageEnglish
Article number012602
JournalJournal of Heat Transfer
Volume130
Issue number1
DOIs
Publication statusPublished - 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

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