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Enhanced Surface Spray Cooling with Embedded and Compound Extended Surface StructuresExperiments were conducted to study the effects of enhanced surface structures on heat flux using spray cooling. The surface enhancements consisted of embedded structures (dimples, pores, and tunnels) and compound extended surface enhancements (straight fins, cubic pin fins and dimples) machined on and within the top surface of copper heater blocks. 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 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) with a bulk fluid temperature of 20.5 C. Results for both the nominally degassed and gassy cases show that the highest critical heat flux (CHF) was attained using straight fins and porous tunnels. For the nominally degassed case, both had a CHF of approx.: 142 W/sq cm while for the gassy case their CHF values increased to 175 W/sq cm. This gave an enhancement relative to the nominally degassed flat surface case of approx. 77% and 119% respectively.
Document ID
20060020079
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Silk, Erie 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 23, 2013
Publication Date
January 1, 2006
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: Itherm 2006
Location: San Diego, CA
Country: United States
Start Date: May 30, 2006
End Date: June 2, 2006
Funding Number(s)
CONTRACT_GRANT: N00014-04-1-0315
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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