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Optical Engineering

Calculations of the average normal effective emissivity for nonaxisymmetric cavities using the modified finite volume method
Author(s): Dong Liu; Yuan-Yuan Duan; Zhen Yang
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Paper Abstract

The average normal effective emissivity is widely used for calibration since it depends only on the intrinsic cavity characteristics; thus, it is an important parameter for blackbody designs and evaluations. Nonaxisymmetric cavities are widely used as standard blackbody sources and cryogenic solar absolute radiometers. The finite volume method is modified by adding a black-hole cylindrical extension to extend the integrated effective emissivity computations to the much more complex computations of average normal effective emissivities for nonaxisymmetric cavities. The calculated results using the modified finite volume method have an average relative difference of 0.085% from the Monte Carlo method, which is the only reported method for average normal effective emissivities of nonaxisymmetric cavities. The results show that this method can be used effectively for calculating the average normal effective emissivities of cavities with complex geometries.

Paper Details

PDF: 5 pages
Opt. Eng. 52(3) 039702 doi: 10.1117/1.OE.52.3.039702
Published in: Optical Engineering Volume 52, Issue 3, March 2013
Show Author Affiliations
Dong Liu, Tsinghua Univ. (China)
Yuan-Yuan Duan, Tsinghua Univ. (China)
Zhen Yang, Tsinghua Univ. (China)


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