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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

A New Method for Measuring Thermal Contact Conductance—Experimental Technique and Results

[+] Author and Article Information
Simon Woodland

Thermo-Fluid Systems University Technology Centre, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK

Andrew D. Crocombe

Division of Mechanical, Medical, and Aerospace Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK

John W. Chew1

Thermo-Fluid Systems University Technology Centre, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UKj.chew@surrey.ac.uk

Stephen J. Mills

Department of Combustion Engineering, Rolls Royce, Derby, Derbyshire, DE24 8BJ, UK

1

Corresponding author.

J. Eng. Gas Turbines Power 133(7), 071601 (Mar 10, 2011) (8 pages) doi:10.1115/1.4001770 History: Received August 28, 2009; Revised January 27, 2010; Published March 10, 2011; Online March 10, 2011

Thermal contact conductance (TCC) is used to characterize heat transfer across interfaces in contact. It is important in thermal modeling of turbomachinery components and finds many other applications in the aerospace, microelectronic, automotive and metal working industries. In this paper, a new method for measuring TCC is described and demonstrated. A test rig is formed from an instrumented split tube with in-line washers and loading applied under controlled conditions. The experimental method and data analysis are described, and the effects on thermal contact conductance of important parameters such as the contact pressure, surface roughness, temperature, thermal conductivity, and material strength are investigated. Normalization of the TCC measured in the experimental program was carried out using appropriate surface and material parameters. The results of this normalization are used to compare the normalized experimental results with various models from the literature.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the test setup using embedded thermocouples and a stack of washers

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Figure 2

Schematic of the shift technique for a single washer

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Figure 3

Effect of pressure on TCC

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Figure 4

Effect of surface roughness on TCC

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Figure 5

Effect of temperature on TCC

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Figure 6

Effect of thermal conductivity on TCC

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Figure 7

Effect of material strength on TCC

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Figure 8

Experimental results for flat surfaces

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Figure 9

Comparison of the experimental data with plastic models from the literature

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