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Influence of Intense Symmetric Heating and Variable Physical Properties on the Thermo-Buoyant Airflow Inside Vertical Parallel-Plate Channels

[+] Author and Article Information
Biagio Morrone

Dipartimento di Ingegneria Aerospaziale e Meccanica (DIAM), Seconda Università degli Studi di Napoli, Via Roma 29, 81031 Aversa (CE), Italy

Antonio Campo1

Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX 78249antonio.campo@utsa.edu

1

Corresponding author.

J. Heat Transfer 132(10), 104501 (Jul 23, 2010) (5 pages) doi:10.1115/1.4001932 History: Received August 04, 2008; Revised January 08, 2010; Published July 23, 2010; Online July 23, 2010

This paper deals with the steady, laminar, and two-dimensional natural convection inside vertical parallel-plate channels with isoflux heating. The main objective of this paper is to assess the joint influence of intense heating and variable physical properties on the flow and heat transfer characteristics of the upward air. To capture the physics of the problem, the discretized conservation equations are solved by the finite-volume technique in an aggrandized computational domain that is much larger than the physical domain. Representative numerical results based on the FLUENT computer program are presented in terms of local quantities such as air velocity and temperature profiles, as well as global quantities such as the average heat transfer coefficients and mass flow rates, all in response to the controlling geometrical and thermal parameters. A detailed comparison of these results is made against those produced by the simple model limited to constant physical properties.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of the physical domain and the two-sided enlarged computational domain

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Figure 2

Local Nusselt numbers varying with the axial coordinate X for constant physical properties. Three different grids are tested.

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Figure 3

Axial velocity varying with the transverse coordinate Y at (a) the channel inlet and (b) the channel exit under the influence of qw=250 W m−2 and Ra=6.7×106

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Figure 4

Temperature varying with the transverse coordinate Y at (a) the channel inlet and (b) the channel exit under the influence of qw=250 W m−2 and Ra=6.7×106

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Figure 5

Axial velocity varying with the transverse coordinate Y at (a) the channel inlet and (b) the channel exit under the influence of qw=2500 W m−2 and Ra=6.7×106

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Figure 6

Temperature varying with the transverse coordinate Y at (a) the channel inlet and (b) the channel exit under the influence of qw=2500 W m−2 and Ra=6.7×107

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Figure 7

Plate temperatures as a function of the axial coordinate X for (a) qw=250 W m−2 and (b) qw=2500 W m−2

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