Turbulent Natural Convection and Surface Radiation in a Closed Air Cavity with a Local Energy Source

I. V. Miroshnichenko, M. A. Sheremet

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We have investigated the flow structure and the heat exchange inside a closed square cavity with isothermal vertical and adiabatic horizontal walls in the presence of a local constant-temperature energy source. Analysis has been performed on the basis of solving the equations of mathematical physics describing the considered process in dimensionless variables "stream function–velocity vorticity–temperature." We have obtained the isoline distributions of the stream function and temperature reflecting the influence of the lifting force and the reduced emissivity factor of enclosing surfaces on the flow pattern and the heat transfer. It has been established that an increase in the emissivity of the walls intensifies the convective flow inside the cavity and enhances the heat exchange.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Engineering Physics and Thermophysics
DOIs
Publication statusAccepted/In press - 17 Jun 2017

Fingerprint

energy sources
emissivity
Natural convection
free convection
Radiation
heat
cavities
convective flow
air
radiation
Flow structure
Air
Flow patterns
flow distribution
Physics
heat transfer
Heat transfer
Temperature
physics
temperature

Keywords

  • diathermal medium
  • finite difference method
  • local energy source
  • natural convection
  • thermal surface radiation
  • turbulence

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)

Cite this

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N2 - We have investigated the flow structure and the heat exchange inside a closed square cavity with isothermal vertical and adiabatic horizontal walls in the presence of a local constant-temperature energy source. Analysis has been performed on the basis of solving the equations of mathematical physics describing the considered process in dimensionless variables "stream function–velocity vorticity–temperature." We have obtained the isoline distributions of the stream function and temperature reflecting the influence of the lifting force and the reduced emissivity factor of enclosing surfaces on the flow pattern and the heat transfer. It has been established that an increase in the emissivity of the walls intensifies the convective flow inside the cavity and enhances the heat exchange.

AB - We have investigated the flow structure and the heat exchange inside a closed square cavity with isothermal vertical and adiabatic horizontal walls in the presence of a local constant-temperature energy source. Analysis has been performed on the basis of solving the equations of mathematical physics describing the considered process in dimensionless variables "stream function–velocity vorticity–temperature." We have obtained the isoline distributions of the stream function and temperature reflecting the influence of the lifting force and the reduced emissivity factor of enclosing surfaces on the flow pattern and the heat transfer. It has been established that an increase in the emissivity of the walls intensifies the convective flow inside the cavity and enhances the heat exchange.

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KW - thermal surface radiation

KW - turbulence

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