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Research Papers: Natural and Mixed Convection

Investigations on Multimode Heat Transfer From a Heated Vertical Plate

[+] Author and Article Information
R. Krishna Sabareesh, S. Prasanna

Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory, IIT Madras, Chennai 600036, India

S. P. Venkateshan1

Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory, IIT Madras, Chennai 600036, Indiaprofspv@gmail.com

1

Corresponding author.

J. Heat Transfer 132(3), 032501 (Dec 29, 2009) (8 pages) doi:10.1115/1.4000055 History: Received March 27, 2009; Revised August 07, 2009; Published December 29, 2009; Online December 29, 2009

The interaction of surface radiation and conduction with natural convection heat transfer from a vertical flat plate assembly, with an embedded heater, has been investigated, both experimentally (using differential interferometer) and numerically (using FLUENT ), in the present work. In the absence of radiation, the asymptotic limits that can be attained by the heated plate are isothermal and isoflux conditions. High values of plate thermal conductivity tend to make the surface isothermal, where as, lower values of thermal conductivity tend to make it isoflux. Irrespective of the thermal conductivity of the plate, an increase in the emissivity reduces the average temperature of the plate and brings the plate toward isothermal condition. A new methodology has also been proposed to determine the thermophysical properties, emissivity and thermal conductivity, the consistency of which is tested by carrying out experiments for various heat inputs and comparing the estimated values with those available in literature.

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Figures

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Figure 1

Photograph of the DI used in the present study

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Figure 2

Schematic diagram of the DI

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Figure 3

Schematic of test setup

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Figure 4

A typical interference fringe pattern along a heated vertical flat plate

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Figure 5

Sketch of the physical geometry showing energy balance for a wall element

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Figure 6

Sketch of the mesh used. The gradual variation in the fineness of the mesh is also shown.

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Figure 7

Least square residual plots for determining the thermal conductivity of titanium and bakelite

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Figure 8

Effect of thermal conductivity for ε=0 (numerical)

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Figure 9

Effect of thermal conductivity for low emissivity (experimental)

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Figure 10

Effect of surface emissivity for k=1 and 200 W/m K (numerical)

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Figure 11

Effect of surface emissivity for bakelite and titanium (experimental)

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