Determining thermal conductivity and thermal diffusivity of low-density gases using the transient short-hot-wire method

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Title Determining thermal conductivity and thermal diffusivity of low-density gases using the transient short-hot-wire method
Author Woodfield, Peter; Fukai, J.; Fujii, M.; Takata, Y.; Shinzato, K.
Journal Name International Journal of Thermophysics
Year Published 2008
Place of publication United States
Publisher Springer
Abstract The transient short-hot-wire method for measuring thermal conductivity and thermal diffusivity makes use of only one thermal-conductivity cell, and end effects are taken into account by numerical simulation. A search algorithm based on the Gauss–Newton nonlinear least-squares method is proposed to make the method applicable to high-diffusivity (i.e., low-density) gases. The procedure is tested using computer-generated data for hydrogen at atmospheric pressure and published experimental data for low-density argon gas. Convergence is excellent even for cases where the temperature rise versus the logarithm of time is far from linear. The determined values for thermal conductivity from experimental data are in good agreement with published values for argon, while the thermal diffusivity is about 10 % lower than the reference data. For the computer-generated data, the search algorithm can return both thermal conductivity and thermal diffusivity to within 0.02 % of the exact values. A one-dimensional version of the method may be used for analysis of low-density gas data produced by conventional transient hot-wire instruments.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1007/s10765-008-0468-z
Volume 29
Issue Number 4
Page from 1299
Page to 1320
ISSN 1572-9567
Date Accessioned 2010-10-25
Date Available 2011-05-03T04:45:38Z
Language en_AU
Research Centre Centre for Infrastructure Engineering and Management
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Mechanical Engineering
URI http://hdl.handle.net/10072/38485
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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