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Research Papers: Radiative Heat Transfer

Thermal Radiation From Vertical Turbulent Jet Flame: Line Source Model

[+] Author and Article Information
Kuibin Zhou

Jiangsu Key Laboratory of Hazardous
Chemicals Safety and Control,
College of Safety Science and Engineering,
Nanjing Tech University,
Nanjing, Jiangsu 210009, China
e-mail: kbzhou@njtech.edu.cn

Juncheng Jiang

Jiangsu Key Laboratory of Hazardous Chemicals
Safety and Control,
College of Safety Science and Engineering,
Nanjing Tech University,
Nanjing, Jiangsu 210009, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 11, 2015; final manuscript received October 3, 2015; published online December 29, 2015. Assoc. Editor: Zhixiong Guo.

J. Heat Transfer 138(4), 042701 (Dec 29, 2015) (8 pages) Paper No: HT-15-1190; doi: 10.1115/1.4032151 History: Received March 11, 2015; Revised October 03, 2015

It is often reported that a jet fire occurs in industrial installations or in the transportation of hazardous materials and could amplify the scale of accident by imposing lots of heat on people and nearby facilities. This paper presents a new semi-empirical radiation model, namely, the line source model to predict the radiant heat flux distribution around a vertical turbulent hydrocarbon jet flame. In terms of the fact that the jet flame holds the large ratio of flame length to diameter, the new model assumes that all thermal energy is emitted by a line source located inside the jet flame volume. With three typically different shapes to simulate the jet flame shape, a formula is proposed to characterize the profile of the emissive power per line length (EPPLL), by which the line source model can be closed in theory. In comparison with the point source model, the multipoint source model, and the solid flame model, the new model agrees better with the measurement of the heat flux radiated from a small jet flame. It is found that the line source model can well predict the radiant heat flux of both small and large jet flames, yet with the flame shape simulated by the back-to-back cone and the cone–cylinder combined shape, respectively. By parameter sensitivity and uncertainty analysis, the ranking by importance of input parameters is also given for the new model.

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Copyright © 2016 by ASME
Topics: Flames , Radiant heat , Shapes
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References

Figures

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Fig. 1

Schematic of radiant heat transfer from jet flame to any nearby target

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Fig. 2

Horizontal profile of the radiant heat flux calculated by line source model (ellipse + ellipse) and experimental data

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Fig. 3

Vertical profile of the radiant heat flux calculated by line source model (ellipse + ellipse) and experimental data

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Fig. 4

Horizontal profile of the radiant heat flux calculated by line source model (cone + cylinder) and experimental data

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Fig. 5

Vertical profile of the radiant heat flux calculated by line source model (cone + cylinder) and experimental data

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Fig. 6

Horizontal profile of the radiant heat flux calculated by line source model (cone + cone) and experimental data

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Fig. 7

Vertical profile of the radiant heat flux calculated by line source model (cone + cone) and experimental data

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Fig. 8

Comparison of the radiant heat flux profiles in the horizontal direction by different models

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Fig. 9

Comparison of the radiant heat flux profiles in the vertical direction by different models

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Fig. 10

Large jet flame radiation measurement versus prediction by (a) line source model and (b) weighted multipoint source model

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Fig. 11

Relative uncertainty of radiant heat flux versus input parameters for line source model

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