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Research Papers

Development and Evaluation of the Time-Resolved Heat and Temperature Array

[+] Author and Article Information
David Hubble

Department of Mechanical Engineering, Virginia Tech, 114R Randolph Hall, Blacksburg, VA 24061dhubble@vt.edu

Thomas Diller

Department of Mechanical Engineering, Virginia Tech, 114R Randolph Hall, Blacksburg, VA 24061tdiller@vt.edu

J. Thermal Sci. Eng. Appl 2(3), 031003 (Dec 07, 2010) (9 pages) doi:10.1115/1.4002772 History: Received March 25, 2010; Revised October 08, 2010; Published December 07, 2010; Online December 07, 2010

The development and evaluation of a differential style heat flux gauge is presented. The sensor is constructed from spot-welded foils of copper and constantan on either side of a thin Kapton polyimide film and is capable of measuring the heat flux and surface temperature at ten locations simultaneously. Analytical modeling was performed to estimate the sensor’s sensitivity and time response. Calibrations were performed in conduction and radiation yielding an average heat flux sensitivity of 20.4μV/(kW/m2). Time response measurements were also performed, which gave an average 63% time response of 168 ms. The capabilities of the sensor are demonstrated by showing its use in ongoing convection research.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Conceptual design of THeTA

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Figure 2

THeTA during construction

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Figure 4

Side view of THeTA and electrical analogy

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Figure 5

Conduction calibration facility

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Figure 6

Conduction calibration results

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Figure 7

Sensitivity dependence on sensor thickness

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Figure 8

Lamp radiation intensity as a function of radial distance

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Figure 9

Radiation calibration setup

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Figure 10

Radiation calibration results

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Figure 11

Response of THeTA to step heat flux input

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Figure 12

Time response of the logarithmic heat flux

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Figure 13

Hybrid heat flux response of THeTA to step heat flux input

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Figure 14

Setup for convection analysis

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Figure 15

Comparison of measured and predicted heat transfer coefficient values

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Figure 16

Sensor application, vortex ring impinging on a heated plate

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