Numerical study of a transitional natural ventilation flowdriven by a line source plume with varied Reynolds and Prandtl numbers

Tae Hattori, Steven W. Armfield, Michael P. Kirkpatrick, Shigenao Maruyama, Atsuki Komiya

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The effects of the parameters, Reynolds number, Re, and Prandtl number, Pr, on natural ventilation flow in the transitional regime, with a line heat flux source, are investigated using two-dimensional direct numerical simulations. Results have been obtained for Re and Pr in the ranges, 5.0×10 5 ≤ Re ≤ 1.58×10 6 and 0.7 ≤ Pr ≤ 70. Flows with constant heat flux, q ~ Re 2/Pr, at Re 2/Pr = 3.57×10 10 and 3.57×10 11 are studied in detail. The results obtained in this study provide a good illustration of the effect of Re and Pr on flow turbulence and the fully-developed flow characteristics. In particular, the Pr dependent variation in the turbulence intensity in the upper buoyant layer, and in the plume volume flux, have been shown to increase with reducing Re 2/Pr.

Original languageEnglish
Pages (from-to)511-519
Number of pages9
JournalComputational Thermal Sciences
Volume3
Issue number6
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • Buoyancy-driven flow
  • DNS
  • Displacement cooling
  • Natural convection
  • Turbulence kinetic energy

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Surfaces and Interfaces
  • Fluid Flow and Transfer Processes
  • Computational Mathematics

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