Technical Briefs

Development of a Transparent Heater to Measure Surface Temperature Fluctuations Under Spray Cooling Conditions

[+] Author and Article Information
A. R. Griffin1

Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Room 307, Orlando, FL 32816al366353@ucf.edu

A. Vijayakumar, K. B. Sundaram

School of Electrical Engineering and Computer Science, University of Central Florida, Room 307, Orlando, FL 32816

R.-H. Chen, L. C. Chow

Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Room 307, Orlando, FL 32816


Corresponding author.

J. Heat Transfer 130(11), 114501 (Aug 28, 2008) (4 pages) doi:10.1115/1.2952761 History: Received May 07, 2007; Revised March 24, 2008; Published August 28, 2008

A heater designed to monitor surface temperature fluctuations during pool boiling and spray cooling experiments while the bubbles are simultaneously being observed has been fabricated and tested. The heat source was a transparent indium tin oxide (ITO) layer commercially deposited on a fused quartz substrate. Four copper-nickel thin film thermocouples (TFTCs) on the heater surface measured the surface temperature, while a thin layer of sapphire or synthetic fused silica provided electrical insulation between the TFTCs and the ITO. The TFTCs were microfabricated using the lift-off process to deposit the nickel and copper metal films. The TFTC elements were 50μm wide and overlapped to form a 25×25μm2 junction. A DAQ program recorded the TFTC voltages at a sampling rate of 50kHz and sent a trigger to a high-speed camera to synchronize bubble images with the surface temperature data. As the bubbles and their contact rings grew over the TFTC junction, correlations between bubble behavior and surface temperature changes were demonstrated.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Side-view cross section of the heater

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Figure 2

Top-view photograph of the heater (arrows indicate TFTC junctions)

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Figure 3

Diagram of the experiment setup

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Figure 4

Surface temperature and bubble images during one bubble lifetime (arrows indicate TFTC junction)



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