TY - JOUR

T1 - Local heat transfer coefficients in spray cooling systems measured with temperature oscillation IR thermography

AU - Freund, S.

AU - Pautsch, A. G.

AU - Shedd, T. A.

AU - Kabelac, S.

N1 - Funding Information: The authors appreciate funding granted by Cray, Inc. to the Multiphase Flow Analysis and Visualization Laboratory at the University of Wisconsin–Madison through the Defense Advance Research Projects Agency High Performance Computing program and by the German Research Council (DFG) for the project “Heat Transfer on Complex Flows” at the University of the Federal Armed Forces in Hamburg. The authors are grateful to the Wisconsin Electric Machines and Power Electronics Consortium for the use of their IR camera. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007/5

Y1 - 2007/5

N2 - This paper describes the application of the temperature oscillation IR thermography method to a spray cooling system in order to measure the spatial distribution of the heat transfer coefficients with a resolution of 0.4 mm. This technique allows for the rapid and fluid-independent evaluation of the heat transfer coefficient at the back side of a heat-transferring wall, relying on radiant heating, infrared temperature measurements, and a finite difference model of the wall. The results reveal the distribution of the local heat transfer coefficients over a surface cooled by a single- and a four-nozzle array of a multi-chip spray cooling module. The area averaged results from this method were compared to previous data measured using a conventional approach with a thermal test die and were found to be in good agreement.

AB - This paper describes the application of the temperature oscillation IR thermography method to a spray cooling system in order to measure the spatial distribution of the heat transfer coefficients with a resolution of 0.4 mm. This technique allows for the rapid and fluid-independent evaluation of the heat transfer coefficient at the back side of a heat-transferring wall, relying on radiant heating, infrared temperature measurements, and a finite difference model of the wall. The results reveal the distribution of the local heat transfer coefficients over a surface cooled by a single- and a four-nozzle array of a multi-chip spray cooling module. The area averaged results from this method were compared to previous data measured using a conventional approach with a thermal test die and were found to be in good agreement.

KW - Local heat transfer coefficient

KW - Spray cooling

KW - Temperature oscillations

UR - http://www.scopus.com/inward/record.url?scp=33847190243&partnerID=8YFLogxK

U2 - 10.1016/j.ijheatmasstransfer.2006.09.028

DO - 10.1016/j.ijheatmasstransfer.2006.09.028

M3 - Article

AN - SCOPUS:33847190243

VL - 50

SP - 1953

EP - 1962

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

IS - 9-10

ER -