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Impact of Cubic Pin Finned Surface Structure Geometry upon Spray Cooling Heat TransferExperiments were conducted to study the effects of enhanced surface structures on heat flux using spray cooling. The surface enhancements consisted of cubic pin fins machined on the top surface of copper heater blocks. The structure height, pitch, and width were parametrically vaned. Each copper block had a projected cross-sectional area of 2.0 sq cm. Measurements were also obtained on a heater block with a flat surface for baseline comparison purposes. A 2 x 2 nozzle array was used with PF-5060 as the working fluid. Thermal performance data were obtained under nominally degassed (chamber pressure of 41.4 kPa) and gassy conditions (chamber with N2 gas at 100.7 kPa) with a bulk fluid temperature of 20.5 C. Results for both the degassed and gassy cases show that structure width and separation distance have a dominant effect upon the heat transfer for the size ranges used. Cubic pin fin height had little impact upon heat flux. The maximum critical heat flux (CHF) attained for any of the surfaces was 121 W/sq cm, giving an enhancement of 51% relative to the flat surface case under nominally degassed conditions. The gassy case had a maximum CHF of 149 W/sq cm, giving an enhancement of 38% relative to the flat surface case.
Document ID
20050210120
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
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
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
IPACK2005-73003
Meeting Information
Meeting: ASME International Electronic Packaging and Technical Conference
Location: San Francisco, CA
Country: United States
Start Date: July 17, 2005
End Date: July 22, 2005
Sponsors: American Society of Mechanical Engineers
Funding Number(s)
CONTRACT_GRANT: N00014-04-10315
Distribution Limits
Public
Copyright
Public Use Permitted.
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