NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Vaporization heat transfer of dielectric liquids on enhanced surfaces covered with screen wicksExperiments were conducted to investigate the vaporization heat transfer characteristics for the dielectric liquid FC-72 on several wicking surfaces which may be used in flat-plate heat pipes. The wicking materials studied included microstructure enhanced surfaces and coarse surfaces covered with screen meshes. Experimental data for q versus deltaT curves and critical heat fluxes were obtained for the two different operating conditions of a heat pipe, evaporation, and shallow pool boiling. When the liquid level was above the heated surface, the height of the liquid level above the surface was varied from 0 to 10 mm. When the liquid level was below the heated surface, the distance from the liquid level to the edge of the surface was adjusted from 0 to 15 mm. Experimental results revealed that for shallow pool boiling when the heated surface was covered with a wire screen mesh, the heat transfer coefficient increased at lower heat fluxes but the critical heat flux (CHF) decreased for all the surfaces tested. In the case of evaporation, both CHF and the heat transfer coefficient increased as the microstructure surfaces were covered with screen meshes.
Document ID
19930062575
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gu, C. B.
(NASA Lewis Research Center Cleveland, OH, United States)
Chow, L. C.
(NASA Lewis Research Center Cleveland, OH, United States)
Pais, M. R.
(Kentucky Univ. Lexington, United States)
Baker, K.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 93-2835
Meeting Information
Meeting: AIAA, Thermophysics Conference
Location: Orlando, FL
Country: United States
Start Date: July 6, 1993
End Date: July 9, 1993
Sponsors: AIAA
Accession Number
93A46572
Funding Number(s)
CONTRACT_GRANT: NAG3-1251
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available