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  • FLUID MECHANICS AND HEAT TRANSFER  (2)
  • Chemistry
  • MATERIALS, METALLIC
  • 1980-1984  (2)
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  • 1
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    Unknown
    Experimental and theoretical deposition rates from salt-seeded combustion gases of a Mach 0.3 burner rig (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Deposition 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.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-2225 , E-1752 , NAS 1.60:2225
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Deposition of Na2SO4 from salt-seeded combustion gases of a high velocity burner rig (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The mechanism of deposition of Na2SO4 was studied under controlled laboratory conditions and the results have been compared to a recently developed comprehensive theory of vapor deposition. Thus Na2SO4, NaCl, NaNO3 and simulated sea salt solutions were injected into the combustor of a nominal Mach 0.3 burner rig burning jet fuel at constant fuel/air ratios. The deposits formed on inert collectors, rotation in the cross flow of the combustion gases, were weighed and analyzed. Collector temperature was uniform and could be varied over a large range by internal air cooling. Deposition rates and dew point temperatures were determined. Supplemental testing included droplet size measurements of the atomized salt solutions. These tests along with thermodynamic and transport calculations were utilized in the interpretation of the deposition results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-83751 , E-2237 , NAS 1.15:83751 , TMS-AIME Fall Meeting; Sep 17, 1984 - Sep 19, 1984; Detroit, MI; United States
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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