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Technical Briefs

An Experimental Study of Effective Thermal Conductivity of High Temperature Insulations

[+] Author and Article Information
Bo-ming Zhang, Wei-hua Xie, Shan-yi Du, Shu-yuan Zhao

Center for Composite Material, Harbin Institute of Technology, Harbin 150080, China

J. Heat Transfer 130(3), 034504 (Mar 06, 2008) (4 pages) doi:10.1115/1.2804946 History: Received September 30, 2006; Revised June 18, 2007; Published March 06, 2008

An experimental apparatus was designed and fabricated to measure the effective thermal conductivities and simulate the temperature and pressure history of reentry of a launch vehicle into a planetary atmosphere with a maximum temperature of 1600°C. An improved testing method was used to test the thermal conductivities of an alumina fibrous insulation at environmental pressures from 0.03Pato105Pa with the average temperature of the sample increased to 864°C and its density being 128kgm3. A method based on temperature difference is used to compute the in-plane effective thermal conductivity, and the result shows that the in-plane thermal conductivity along the y axis is 1.47 times that along the x axis. The influences of temperature and pressure on the contribution of three heat transfer mechanisms to the effective thermal conductivities were compared.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Photograph of high vacuum graphite heating chamber

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Figure 2

Schematic diagram of the interior of heating

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Figure 3

Photograph of testing sample in chamber

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Figure 4

The effective thermal conductivity versus average temperature at three environmental pressures

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Figure 5

The effective thermal conductivity versus pressure at four average temperatures

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