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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

RADIATION EFFECTS WITH THE TRANSIENT LINE SOURCE MEASUREMENT OF FLUID THERMAL CONDUCTIVITY

Get access (open in a dialog) DOI: 10.1615/IHTC6.2730
pages 79-84

要約

The apparent thermal conductivities of fluids (particularly organic liquids) measured by the transient line source technique are higher than the real values, depending upon the optical and thermal properties of the fluid and the geometry of the apparatus due to the effects of radiation heat transfer.
In this paper, authors propose a method to analyze this problem, and demonstrate theoretically the process and mechanism by which radiation heat transfer causes the higher apparent thermal conductivities. The ratio of the apparent thermal conductivity and the real thermal conductivity, λapp/λ, is discussed in non-dimensional form, and the correction-factors, (λapp/λ)t→0, necessary for the measured values are shown, using non-dimensional parameters, ε, R and r1rsn2T30/λ, to apply to arbitrary measuring conditions.
Comparison with actual measured values on toluene shows good agreement.