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Technical Briefs

Measuring the Thermal Conductivity of Flowing Liquid Samples Using the Three Omega Method

[+] Author and Article Information
Jonggan Hong, Dongsik Kim

Department of Mechanical Engineering, POSTECH, Pohang 790–784, Republic of Koreaposhjg@postech.edu

J. Heat Transfer 134(9), 094502 (Jun 29, 2012) (7 pages) doi:10.1115/1.4006384 History: Received March 15, 2011; Revised March 12, 2012; Published June 27, 2012; Online June 29, 2012

The thermal conductivity of a liquid is generally measured under conditions that suppress bulk flow in the sample. However, in situ measurement of the thermal conductivity of a flowing liquid would be useful in various scientific and engineering applications. This work demonstrates that a thermal wave technique, such as the three omega method, can effectively measure the thermal conductivity of flowing liquid if the frequency range is adjusted such that the thermal boundary layer is sufficiently thinner than the momentum boundary layer. A new dimensionless number was defined to assess the convection effects, and a criterion for thermal conductivity measurements was obtained for water flowing in a circular tube.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 6

Measurement of the thermal conductivity of water flowing in circular tubes

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Figure 5

Correlation between the dimensionless number describing the convection effects and the sensor signals

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Figure 4

Numerical results of the real part of the temperature oscillation: D = 2.2 mm, heating frequency = 1 Hz, and mean velocity U0 of water = (a) 0 and (b) 0.55 m/s

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Figure 3

Experimental setup

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Figure 2

Computational domains for numerical simulation

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Figure 1

Schematic diagram illustrating the thermal wave problem in a circular tube

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