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Research Papers: Radiative Heat Transfer

Experimental Measurement of Direct Thermal Radiation Through Single-Layer Square-Cell Plain Woven Screens

[+] Author and Article Information
Javad Hashempour

Computational Engineering and
Science Research Centre (CESRC),
Faculty of Health, Engineering and Sciences,
University of Southern Queensland,
Toowoomba QLD 4350, Australia
e-mail: javad.hashempour@usq.edu.au

Ahmad Sharifian

Computational Engineering and
Science Research Centre (CESRC),
Faculty of Health, Engineering and Sciences,
University of Southern Queensland,
Toowoomba QLD 4350, Australia
e-mail: sharifia@usq.edu.au

John Billingsley

School of Mechanical and Electrical Engineering,
Faculty of Health, Engineering and Sciences,
University of Southern Queensland,
Toowoomba QLD 4350, Australia
e-mail: john.billingsley@usq.edu.au

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 18, 2014; final manuscript received July 10, 2015; published online August 11, 2015. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 138(1), 012701 (Aug 11, 2015) (6 pages) Paper No: HT-14-1684; doi: 10.1115/1.4031110 History: Received October 18, 2014

Australian bushfires have repeatedly killed many people and caused severe damage. Previous studies have identified direct flame contact and radiant heat as the main cause of fatalities. The role of screens to limit the radiation exposure of an object by a fire on the opposite side of the screen is well-known, but still it has not been experimentally quantified. A screen between a radiation source and an object divides the radiant heat flux (RHF) into two parts. The first part is the direct RHF (DRHF) that passes directly through the screen without any interaction. The second part is indirect RHF (IRHF), which includes both emitted and reflected RHFs by the heated screen. This experimental study deals with the DRHF, which is dependent on the screen porosity and is independent of the material composition or the surface quality of the screen. The experimental results of four square-cell, plain woven screens, with porosities ranging from 41% to 66%, show that the passing ratios (PRs) of DRHF through screens are less than those suggested by their porosity. Four empirical equations have been developed to determine the PR of the direct radiation through screen and the tunnel vision angles of the screens.

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References

Figures

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Fig. 2

Applied wire screens with porosities: (a) 54% and (b) 66%

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Fig. 1

The experiment setup: (a) setup configuration without screen, (b) L-shaped steel brace, and (c) setup configuration with the screen

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Fig. 4

Change of tunnel vision angle with screen porosities for experiment and Eq. (7)

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Fig. 3

Captured tunnel vision area for wire screens with porosity: (a) 41%, (b) 54%, (c) 58%, and (d) 66%

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Fig. 5

The intensity distribution of light in the presence and the absence of screen with 66% porosity

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Fig. 6

Change of PR with screen porosities for experiment and Eq. (8)

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Fig. 7

Change of PRs of an infinite source with screen porosities using Eqs. (1) and (14)

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