Numerical investigation of conjugate mixed convection in a rectangular cavity with heat-conducting walls of finite thickness under conditions of radiant energy supply

G. V. Kuznetsov, V. Yu Zyubanov, A. E. Nee

Research output: Contribution to journalArticle

Abstract

A mathematical modeling of conjugate heat transfer in a semi-open rectangular cavity filled with air and semi-restricted by solid heat-conducting walls of finite thickness is performed under conditions of radiant energy supply in a mixed convection mode. According to the results of numerical modeling, differential (fields of temperature and stream function) and integral (average Nusselt numbers) characteristics of heat exchange have been obtained in a wide range of governing parameters (104 ≤ Ra ≤ 106, 300 ≤ Re ≤ 700). Based on the analysis of temperature and stream functions fields, it was established that the conjugate heat transfer process under study had a significantly unsteady nature. Scale influence of lifting force increasing on isolines of temperature and stream function formation in the air cavity is shown. It was found that an increase in the Rayleigh number leads to a rise in the average Nusselt number in a mixed convection mode.

Original languageEnglish
Pages (from-to)1459-1472
Number of pages14
JournalHeat Transfer Research
Volume48
Issue number16
DOIs
Publication statusPublished - 1 Jan 2017

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Mixed convection
convection
Nusselt number
conduction
heat
cavities
radiation
heat transfer
Heat transfer
air
Rayleigh number
Air
Temperature
temperature
Hot Temperature

Keywords

  • Conduction
  • Conjugate heat transfer
  • Infrared radiation
  • Laminar flow
  • Mathematical modeling
  • Mixed convection

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "A mathematical modeling of conjugate heat transfer in a semi-open rectangular cavity filled with air and semi-restricted by solid heat-conducting walls of finite thickness is performed under conditions of radiant energy supply in a mixed convection mode. According to the results of numerical modeling, differential (fields of temperature and stream function) and integral (average Nusselt numbers) characteristics of heat exchange have been obtained in a wide range of governing parameters (104 ≤ Ra ≤ 106, 300 ≤ Re ≤ 700). Based on the analysis of temperature and stream functions fields, it was established that the conjugate heat transfer process under study had a significantly unsteady nature. Scale influence of lifting force increasing on isolines of temperature and stream function formation in the air cavity is shown. It was found that an increase in the Rayleigh number leads to a rise in the average Nusselt number in a mixed convection mode.",
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AU - Kuznetsov, G. V.

AU - Zyubanov, V. Yu

AU - Nee, A. E.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - A mathematical modeling of conjugate heat transfer in a semi-open rectangular cavity filled with air and semi-restricted by solid heat-conducting walls of finite thickness is performed under conditions of radiant energy supply in a mixed convection mode. According to the results of numerical modeling, differential (fields of temperature and stream function) and integral (average Nusselt numbers) characteristics of heat exchange have been obtained in a wide range of governing parameters (104 ≤ Ra ≤ 106, 300 ≤ Re ≤ 700). Based on the analysis of temperature and stream functions fields, it was established that the conjugate heat transfer process under study had a significantly unsteady nature. Scale influence of lifting force increasing on isolines of temperature and stream function formation in the air cavity is shown. It was found that an increase in the Rayleigh number leads to a rise in the average Nusselt number in a mixed convection mode.

AB - A mathematical modeling of conjugate heat transfer in a semi-open rectangular cavity filled with air and semi-restricted by solid heat-conducting walls of finite thickness is performed under conditions of radiant energy supply in a mixed convection mode. According to the results of numerical modeling, differential (fields of temperature and stream function) and integral (average Nusselt numbers) characteristics of heat exchange have been obtained in a wide range of governing parameters (104 ≤ Ra ≤ 106, 300 ≤ Re ≤ 700). Based on the analysis of temperature and stream functions fields, it was established that the conjugate heat transfer process under study had a significantly unsteady nature. Scale influence of lifting force increasing on isolines of temperature and stream function formation in the air cavity is shown. It was found that an increase in the Rayleigh number leads to a rise in the average Nusselt number in a mixed convection mode.

KW - Conduction

KW - Conjugate heat transfer

KW - Infrared radiation

KW - Laminar flow

KW - Mathematical modeling

KW - Mixed convection

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