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Research Papers: Experimental Techniques

A Phase-Sensitive Technique for Measurements of Liquid Thermal Conductivity

[+] Author and Article Information
Zhefu Wang

Department of Mechanical Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR 97331

Richard B. Peterson

Department of Mechanical Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR 97331richard.peterson@oregonstate.edu

J. Heat Transfer 132(5), 051601 (Mar 05, 2010) (8 pages) doi:10.1115/1.3211858 History: Received August 29, 2008; Revised June 22, 2009; Published March 05, 2010; Online March 05, 2010

An experimental technique based on the thermal wave approach for measuring the thermal conductivity of liquids is developed in this paper. A stainless steel strip functions as both a heating element and a sealing cover for a chamber containing a test liquid. A periodic current passing through this metal strip generates a periodic Joule heating source. An infrared detector measures the temperature response at the front surface of the stainless steel strip. The phase and magnitude of the temperature response with respect to the heating signal were measured by a lock-in amplifier at various frequencies from 22 Hz to 502 Hz. A one-dimensional, two-layered transient heat conduction model was developed to predict the temperature response on the front surface of the stainless steel strip. The phase information from this temperature response shows high sensitivity to the change in thermal properties of the liquid layer and is employed to match experimental data to find the thermal properties of the test liquid. The measured thermal conductivities of water and ethylene glycol agree quite well with the data from literature and support the validity of this measurement technique. An aqueous fluid consisting of gold nanoparticles is tested and anomalous thermal conductivity enhancement is observed. A discrepancy in the thermal transport behavior between pure liquids and nanofluids is suggested from our experimental results.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic sketches of the principles of the measurement

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Figure 2

Normalized amplitude and phase shift—water and ethylene glycol

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Figure 3

Test cell design

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Figure 4

Resistance of the stainless steel strip

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Figure 5

The schematic of the experimental apparatus

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Figure 6

Diagram of the power switch

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Figure 7

The waveform of temperature signal

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Figure 8

Normalized amplitude and phase shift—water and nanofluid

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