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Turbulent natural convection combined with surface thermal radiation in a square cavity with local heater

Igor Miroshnichenko (Laboratory on Convective Heat and Mass Transfer, Tomsk State University, Tomsk, Russia)
Mikhail Sheremet (Laboratory on Convective Heat and Mass Transfer, Tomsk State University, Tomsk, Russia)
Ali J. Chamkha (Department of Mechanical Engineering, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar, Saudi Arabia and Rak Research and Innovation Center, American University of Ras Al Khaimah, Ras Al Khaimah, United Arab Emirates)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 4 September 2018

Issue publication date: 25 September 2018

112

Abstract

Purpose

The purpose of this paper is to conduct a numerical analysis of transient turbulent natural convection combined with surface thermal radiation in a square cavity with a local heater.

Design/methodology/approach

The domain of interest includes the air-filled cavity with cold vertical walls, adiabatic horizontal walls and isothermal heater located on the bottom cavity wall. It is assumed in the analysis that the thermophysical properties of the fluid are independent of temperature and the flow is turbulent. Surface thermal radiation is considered for more accurate analysis of the complex heat transfer inside the cavity. The governing equations have been discretized using the finite difference method with the non-uniform grid on the basis of the special algebraic transformation. Turbulence was modeled using the kε model. Simulations have been carried out for different values of the Rayleigh number, surface emissivity and location of the heater.

Findings

It has been found that the presence of surface radiation leads to both an increase in the average total Nusselt number and intensive cooling of such type of system. A significant intensification of convective flow was also observed owing to an increase in the Rayleigh number. It should be noted that a displacement of the heater from central part of the bottom wall leads to significant modification of the thermal plume and flow pattern inside the cavity.

Originality/value

An efficient numerical technique has been developed to solve this problem. The originality of this work is to analyze unsteady turbulent natural convection combined with surface thermal radiation in a square air-filled cavity in the presence of a local isothermal heater. The results would benefit scientists and engineers to become familiar with the analysis of turbulent convective–radiative heat transfer in enclosures with local heaters, and the way to predict the heat transfer rate in advanced technical systems, in industrial sectors including transportation, power generation, chemical sectors and electronics.

Keywords

Acknowledgements

This work was supported by the Russian Science Foundation (Project No. 17-79-20141).

Citation

Miroshnichenko, I., Sheremet, M. and Chamkha, A.J. (2018), "Turbulent natural convection combined with surface thermal radiation in a square cavity with local heater", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 28 No. 7, pp. 1698-1715. https://doi.org/10.1108/HFF-03-2018-0089

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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