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Investigation of Enhanced Surface Spray CoolingExperiments were conducted to study the effects of enhanced surfaces on heat transfer during spray cooling. The surface enhancements consisted of cubic pin fins, pyramids, and straight fins (uniform cross sectional straight fins) machined on the top surface of copper heater blocks. Each had a cross-sectional area of 2.0 square cm. Measurements were also obtained on a heater block with a flat surface for baseline comparison purposes. A 2x2 nozzle array was used with PF-5060 as the working fluid. Thermal performance data was obtained under nominally degassed (chamber pressure of 41.4 kPa ) and gassy conditions (chamber with N2 gas at 101 kPa). The results show that the straight fins had the largest enhancement in heat flow. Critical heat flux (CHF) for this surface showed an increase of 55% in comparison to the flat surface for the nominally degassed condition. The cubic pin finned and pyramid surfaces provided slightly more than half the heat flux enhancement (30% - 40% greater than the flat surface) of the straight fins. The gassy case showed that the straight fins again provided the largest enhancement (48%) in CHF relative to the flat surface. This was followed by the cubic pin fins, and pyramids which had increases of 31% and 18% respectively. No significant effect was observed in the surface temperature at which CHF occurs for either portion of the study.
Document ID
20040171563
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Silk, Eric A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kim, Jungho
(Maryland Univ. College Park, MD, United States)
Kiger, Ken
(Maryland Univ. College Park, MD, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
IMECE2004-61753
Meeting Information
Meeting: Proceedings of IMECE2004: ASME International Mechanical Engineering Congress
Location: Anaheim, CA
Country: United States
Start Date: November 13, 2004
End Date: November 19, 2004
Sponsors: American Society of Mechanical Engineers
Funding Number(s)
CONTRACT_GRANT: N00014-04-10314
Distribution Limits
Public
Copyright
Other

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