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Technical Briefs

View Factors of Samples Tested in Cone and Cylinder Calorimeters

[+] Author and Article Information
Marcos J. A. Gemaque, Fernando S. Costa

National Institute for Space Research,  Combustion and Propulsion Associated Laboratory, Rodovia Presidente Dutra, km 40, Cachoeira Paulista, SP CEP 12630-000, Brazilmgemaque@hotmail.com

J. Heat Transfer 134(9), 094503 (Jul 02, 2012) (5 pages) doi:10.1115/1.4006270 History: Received July 20, 2011; Revised February 21, 2012; Published July 02, 2012; Online July 02, 2012

Cone and cylinder calorimeters are devices used to determine flammability characteristics of solid materials under prescribed heat inputs. Temperature and heat input distribution on the exposed surface of a specimen in a calorimeter can be affected by variations of position or size of the specimen. This work analyzes the thermal radiation view factors of slabs and cylinders tested in cone and cylinder calorimeters, respectively. Blackbody radiation thermal interchange is assumed and reflections of neighbor objects are not considered. Uniformity of view factor distributions and total view factors are compared for slabs and cylinders tested in calorimeters, considering positioning and size variations.

FIGURES IN THIS ARTICLE
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Copyright © 2012 by American Society of Mechanical Engineers
Topics: Slabs , Cylinders , Heat
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References

Figures

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Figure 1

Schemes of (a) cone calorimeter and (b) cylinder calorimeter. Dimensions in millimeters.

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Figure 2

Scheme of a cone calorimeter and the exposed surface of a specimen (square slab)

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Figure 3

View factor between an area element dA1 of a square and an area element dA2 of a circle

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Figure 4

Scheme of a cylinder calorimeter and a cylindrical specimen

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Figure 5

View factor per unit area (mm−2 ) along the half-diagonal of the exposed surface of a square slab, from the center to the corner of the square with l = 100 mm

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Figure 6

View factor per unit area (mm−2 ) along the side of a cylindrical specimen as function of vertical position, y, and radius, r1 , of the specimen

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