Local Heat Transfer Measurements Using an Electrically Heated Thin Gold-Coated Plastic Sheet

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Abstract
This paper describes an experimental technique for measuring the local heat transfer coefficient in complex flows. The technique employs a gold-coated plastic sheet to generate a nearly uniform wall heat flux. The sheet is mounted on an insulated substrate of the desired shape and heating is achieved by passing an electrical current through the gold coating. Three applications of this technique are described: heat transfer downstream of an abrupt expansion, heat transfer from a cylinder in crossflow, and nonuniform circumferential heating in a pipe. For each of these applications the effect of the wall conduction on the surface heat flux is evaluated and found to be small. The effect of nonuniformities in the gold coating, and of the resistance temperature coefficient, are also evaluated and likewise are found to be quite small. Methods of correcting for each of these small effects are presented for the above applications.

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