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Experimental and theoretical deposition rates from salt-seeded combustion gases of a Mach 0.3 burner rigDeposition rates on platinum-rhodium cylindrical collectors rotating in the cross streams of the combustion gases of a salt-seeded Mach 0.3 burner rig were determined. The collectors were internally air cooled so that their surface temperatures could be widely varied while they were exposed to constant combustion gas temperatures. The deposition rates were compared with those predicted by the chemically frozen boundary layer (CFBL) computer program, which is based on multicomponent vapor transport through the boundary layer. Excellent agreement was obtained between theory and experiment for the NaCl-seeded case, but the agreement lessened as the seed was changed to synthetic sea salt, NaNO3, and K2SO4, respectively, and was particularly poor in the case of Na2SO4. However, when inertial impaction was assumed to be the deposition mechanism for the Na2SO4 case, the predicted rates agreed well with the experimental rates. The former were calculated from a mean particle diameter that was derived from the measured intial droplet size distribution of the solution spray. Critical experiments showed that liquid phase deposits were blown off the smooth surface of the platinum-rhodium collectors by the aerodynamic shear forces of the high-velocity combustion gases but that rough or porous surfaces retained their liquid deposits.
Document ID
19840011673
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Santoro, G. J. (NASA Langley Research Center Hampton, VA, United States)
Kohl, F. J. (NASA Langley Research Center Hampton, VA, United States)
Stearns, C. A. (NASA Langley Research Center Hampton, VA, United States)
Gokoglu, S. A. (Analex Corp.)
Rosner, D. E. (Yale Univ.)
Date Acquired
September 4, 2013
Publication Date
March 1, 1984
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-TP-2225
E-1752
NAS 1.60:2225
Accession Number
84N19741
Funding Number(s)
CONTRACT_GRANT: NAS3-23293
PROJECT: RTOP 505-33-1A
CONTRACT_GRANT: NAG3-201
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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