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RESEARCH PAPERS: Analytical and Experimental Techniques

Sensitivity Analysis for Thermophysical Property Measurements Using the Periodic Method

[+] Author and Article Information
A. Haji-Sheikh, Y. S. Hong, S. M. You

Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, TX 76019-0023

J. V. Beck

Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226

J. Heat Transfer 120(3), 568-576 (Aug 01, 1998) (9 pages) doi:10.1115/1.2824312 History: Received February 07, 1997; Revised March 02, 1998; Online December 05, 2007

Abstract

The frequency domain provides an interesting alternative platform for measuring thermophysical properties. The resulting measurement technique produces reasonably accurate thermophysical data from imprecise surface information. Having a periodic heat flux input at one surface, the thermal diffusivity is obtainable if temperature produces a measurable periodic effect at another location. The analysis shows that only the phase shift is necessary to produce needed information while the boundary conditions can affect the experimental results. This method was tested near room temperature using two different materials: Delrin and 304 stainless steel. The experiments yield accurate thermal diffusivity data for both materials but the data for Delrin exhibit smaller errors. Before performing the experiments, a sensitivity analysis was carried out to determine the best range of frequencies for an experimental investigation.

Copyright © 1998 by The American Society of Mechanical Engineers
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