Mathematical modelling of conjugate heat transfer and fluid flow inside a domain with a radiant heating system

G. V. Kuznetsov, N. I. Kurilenko, A. E. Nee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study deals with the numerical investigation of combined heat transfer by conduction, turbulent natural convection, and surface thermal radiation in a closed square air-filled cavity with a local radiant heater. The turbulent flow was computed within the quasi (pseudo) direct numerical simulation approach. The governing equations were solved by means of the finite difference method. Developed numerical code was validated by comparison of temperature profiles obtained experimentally and numerically. The effect of time, buoyancy force, walls emissivity, and emitter height on local and mean heat transfer characteristics was studied. For the first time it was found that the mean convective Nusselt number at the bottom solid-fluid interface was slightly altered in the cavity with the local radiant heater when varying the governing parameters. An increase in the Rayleigh number led to a significant rise in the overall temperature. The isotherms and streamlines were significantly altered with time. However, the mean radiative Nusselt number was slightly changed over the time.

Original languageEnglish
Pages (from-to)27-39
Number of pages13
JournalInternational Journal of Thermal Sciences
Volume131
DOIs
Publication statusPublished - 1 Sep 2018

Fingerprint

Radiant heating
radiant heating
Nusselt number
fluid flow
Flow of fluids
heat transfer
Heat transfer
heaters
Direct numerical simulation
Heat radiation
Buoyancy
Natural convection
Finite difference method
Turbulent flow
Isotherms
cavities
thermal radiation
Rayleigh number
direct numerical simulation
emissivity

Keywords

  • Conduction
  • Finite difference method
  • Radiant heater
  • Surface radiation
  • Turbulent natural convection

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)

Cite this

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title = "Mathematical modelling of conjugate heat transfer and fluid flow inside a domain with a radiant heating system",
abstract = "This study deals with the numerical investigation of combined heat transfer by conduction, turbulent natural convection, and surface thermal radiation in a closed square air-filled cavity with a local radiant heater. The turbulent flow was computed within the quasi (pseudo) direct numerical simulation approach. The governing equations were solved by means of the finite difference method. Developed numerical code was validated by comparison of temperature profiles obtained experimentally and numerically. The effect of time, buoyancy force, walls emissivity, and emitter height on local and mean heat transfer characteristics was studied. For the first time it was found that the mean convective Nusselt number at the bottom solid-fluid interface was slightly altered in the cavity with the local radiant heater when varying the governing parameters. An increase in the Rayleigh number led to a significant rise in the overall temperature. The isotherms and streamlines were significantly altered with time. However, the mean radiative Nusselt number was slightly changed over the time.",
keywords = "Conduction, Finite difference method, Radiant heater, Surface radiation, Turbulent natural convection",
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AU - Kuznetsov, G. V.

AU - Kurilenko, N. I.

AU - Nee, A. E.

PY - 2018/9/1

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N2 - This study deals with the numerical investigation of combined heat transfer by conduction, turbulent natural convection, and surface thermal radiation in a closed square air-filled cavity with a local radiant heater. The turbulent flow was computed within the quasi (pseudo) direct numerical simulation approach. The governing equations were solved by means of the finite difference method. Developed numerical code was validated by comparison of temperature profiles obtained experimentally and numerically. The effect of time, buoyancy force, walls emissivity, and emitter height on local and mean heat transfer characteristics was studied. For the first time it was found that the mean convective Nusselt number at the bottom solid-fluid interface was slightly altered in the cavity with the local radiant heater when varying the governing parameters. An increase in the Rayleigh number led to a significant rise in the overall temperature. The isotherms and streamlines were significantly altered with time. However, the mean radiative Nusselt number was slightly changed over the time.

AB - This study deals with the numerical investigation of combined heat transfer by conduction, turbulent natural convection, and surface thermal radiation in a closed square air-filled cavity with a local radiant heater. The turbulent flow was computed within the quasi (pseudo) direct numerical simulation approach. The governing equations were solved by means of the finite difference method. Developed numerical code was validated by comparison of temperature profiles obtained experimentally and numerically. The effect of time, buoyancy force, walls emissivity, and emitter height on local and mean heat transfer characteristics was studied. For the first time it was found that the mean convective Nusselt number at the bottom solid-fluid interface was slightly altered in the cavity with the local radiant heater when varying the governing parameters. An increase in the Rayleigh number led to a significant rise in the overall temperature. The isotherms and streamlines were significantly altered with time. However, the mean radiative Nusselt number was slightly changed over the time.

KW - Conduction

KW - Finite difference method

KW - Radiant heater

KW - Surface radiation

KW - Turbulent natural convection

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