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Research Papers: Natural and Mixed Convection

Natural Convection in a Partially Heat Generating Rod Bundle Inside an Enclosure

[+] Author and Article Information
D. Jaya Krishna, S. P. Venkateshan

Heat Transfer and Thermal Power Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600 036, India

M. R. Thansekhar

 SSN College of Engineering, Chennai-603110, India

Tanmay Basak

Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai-600 036, India

Sarit K. Das1

Heat Transfer and Thermal Power Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600 036, Indiaskdas@iitm.ac.in

1

Corresponding author.

J. Heat Transfer 132(10), 102501 (Jul 27, 2010) (11 pages) doi:10.1115/1.4001610 History: Received May 19, 2009; Revised December 29, 2009; Published July 27, 2010; Online July 27, 2010

Buoyancy induced flows in a partially heat generating rod bundle enclosed inside a tall cavity are investigated. First, a detailed experimental study is carried out, and the thermal hydraulics is analyzed at different power inputs and boundary cooling rates of the enclosure. Later, a generalized non-Darcy simulation is developed using a heat generating orthotropic porous media approach and is compared with the experimental results. The results of a numerical simulation for natural convection in enclosed partially heat generating rod bundles satisfactorily predict the temperature distribution within the rod bundle. Finally, a parametric study is carried out by varying the porosity (pitch to diameter ratio of the rod bundle) of the considered enclosure for the understanding of flow physics and heat transfer in such applications.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Rod bundle test section. (b) Air circuit for rod bundle test section.

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Figure 2

Rod bundle arrangement

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Figure 3

Variation in temperature on the outer surface of the rod bundle enclosure for different power per heater and airflow rate: (a) 10 W and 120 kg/h, (b) 20 W and 45 kg/h, (c) 25 W and 45 kg/h, and (d) 25 W and 120 kg/h

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Figure 4

(a) Nonuniform cosine grid. (b) Smoothing for the step input of the heat generation term.

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Figure 5

Radial temperature variation in different planes for airflow rate of 100 kg/h

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Figure 6

Variation in maximum temperature with (a) heater power input for airflow rate of 120.8 kg/h and (b) airflow rate for different heater power inputs

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Figure 7

Comparison of numerical simulation with experimental data for the variation in temperature in radial direction with heater power for the airflow rate of 120 kg/h

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Figure 8

Effect of porosity on variation in temperature distribution along (a) vertical midplane and (b) horizontal plane 3

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Figure 9

Isotherms (left) and velocity vectors (right) with the variation in p/d ratios (porosities): (a) p/d=0.749(ε=0.3) and (b) p/d=1.98(ε=0.9)

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