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Technical Brief

Experimental Validation of a Boundary Layer Convective Heat Flux Measurement Technique

[+] Author and Article Information
Kaustubh S. Kulkarni

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, 111 Church St SE, Minneapolis, MN-55455, USA
kaustubhis@gmail.com

Umesh Madanan

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, 111 Church St SE, Minneapolis, MN-55455, USA
madan016@umn.edu

Terrence W. Simon

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, 111 Church St SE, Minneapolis, MN-55455, USA
simon002@umn.edu

Richard J. Goldstein

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, 111 Church St SE, Minneapolis, MN-55455, USA
rjgme@umn.edu

1Corresponding author.

ASME doi:10.1115/1.4038790 History: Received May 09, 2017; Revised September 18, 2017

Abstract

If a steady thermal boundary layer is sufficiently thick, wall heat fluxes and associated convective heat transfer coefficients can be directly calculated from measured temperature distributions taken within it using a traversing thermocouple probe. The boundary layer can be laminar, turbulent or transitional and on a surface of arbitrary surface temperature distribution and geometry. Herein, this technique is presented and validated in a steady, turbulent, two-dimensional boundary layer on a flat, uniform-heat-flux wall. Care is taken to properly account for radiation from the wall and conduction within the thermocouple wire. In the same setting, heat flux measurements are made for verification purposes using an energy balance on a segment of the test wall carefully designed to minimize and include radiation and conduction effects. Heat flux values measured by the boundary layer measurement technique and by the energy balance measurement agree to within 4.4% and the difference between the two lie completely within their respective measurement uncertainties of 5.74% and 0.6%.

Copyright (c) 2017 by ASME
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