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Session 2366

A Laboratory Experiment for Finding the Radiation View Factor Between a Differential Area and a Plane

Aaron Renner, William S. Janna University of Memphis

Abstract

The unit sphere method was developed in order to measure the view factor between a differential and a finite plane area. This method was used to design an experiment for the undergraduate Heat Transfer Laboratory, and is described in this study. Using methods of descriptive geometry, a graphical equivalent of the sphere method was also developed, which is used additionally in the experiment. The apparatus for measuring view factor is described here. Experimental results for one shape are compared to results obtained by equations. Errors in all cases are within a tolerable limit.

Nomenclature

A = area A = constant in view factor equation a = distance in view factor equation dA = differential area B = constant in view factor equation b = distance in view factor equation c = distance in view factor equation d1 = distance in hemisphere profile d2 = distance in hemisphere profile F = view factor r = radius of circle ra = actual radius of hemisphere S = distance between areas

Greek Letters

β = angle between S and normal to A dω = solid angle

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Janna, W. S., & Renner, A. (1999, June), A Laboratory Experiment For Finding The Radiation View Factor Between A Differential Area And A Plane Paper presented at 1999 Annual Conference, Charlotte, North Carolina. 10.18260/1-2--7798