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research-article

Estimating Two Heat-Conduction Parameters from Two Complementary Transient Experiments

[+] Author and Article Information
Robert McMasters

Department of Mechanical Engineering, Virginia Military Institute, Lexington, Virginia 24450
mcmastersrl@vmi.edu

Filippo de Monte

Department of Industrial and Information Engineering and Economics, University of L'Aquila, Via G. Gronchi n. 18, 67100 L'Aquila, Italy
filippo.demonte@ing.univaq.it

James Beck

Department of Mechanical Engineering, Michigan State University, East Lansing, Mich. 48824
jamesverebeck@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4038855 History: Received August 26, 2017; Revised October 16, 2017

Abstract

A desirable feature of any parameter estimation method is to obtain as much information as possible with one experiment. However, achieving multiple objectives with one experiment is often not possible. In the field of thermal parameter estimation, a determination of thermal conductivity, volumetric heat capacity, heat addition rate, surface emissivity and convection coefficient may be desired from a set of temperature measurements in an experiment where a radiant heat source is used. It would not be possible to determine all of these parameters from such an experiment; more information would be needed. The work presented in the present research shows how thermal parameters can be determined from temperature measurements using complementary experiments where the same material is tested more than once using a different geometry or heating configuration in each experiment. The method of ordinary least squares is used in order to fit a mathematical model to a temperature history in each case. Several examples are provided using one-dimensional conduction experiments, with some having a planar geometry and some having a cylindrical geometry. The parameters of interest in these examples are thermal conductivity and volumetric heat capacity. Sometimes both of these parameters cannot be determined simultaneously from one experiment but utilizing two complementary experiments may allow each of the parameters to be determined. A method is presented as part of the current research by which confidence regions can be found for results from a single analysis of multiple experiments.

Copyright (c) 2017 by ASME
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