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Title:
Homogeneous and heterogeneous condensation of nitrogen in transonic flow
Authors:
Hall, R. M.; Vennemann, D. H.
Affiliation:
AA(NASA, Langley Research Center, Hampton, VA), AB(NASA, Langley Research Center, Hampton, VA; Deutsche Forschungs- und Versuchsanstalt fuer Luft- und Raumfahrt, Cologne, West Germany)
Publication:
International Symposium on Rarefied Gas Dynamics, 13th, Novosibirsk, USSR, July 5-9, 1982, Paper. 12 p.
Publication Date:
07/1982
Category:
Fluid Mechanics and Heat Transfer
Origin:
STI
NASA/STI Keywords:
CONDENSING, NITROGEN, NUCLEATION, TRANSONIC FLOW, AIRFOILS, CRYOGENIC WIND TUNNELS, DROPS (LIQUIDS)
Bibliographic Code:
1982rgdy.symp.....H

Abstract

Onset of both homogeneous and heterogeneous nucleation for nitrogen gas has been measured in the Langley 0.3m Transonic Cryogenic Tunnel. Homogeneous nucleation data have been taken using a DFVLR CAST-10 airfoil and are used to evaluate classical liquid droplet theory and several proposed corrections to it. A correction for differences in translational energy states between the droplet and the bulk liquid due to either Reiss (1977) or Kikuchi (1977) achieves good agreement between the predicted onset of nucleation and the data. Good agreement is also found using a Tolman constant of 0.25 x 10 to the -10th m. Onset of heterogeneous nucleation on pre-existing seed particles in the flow has also been studied, and preliminary estimates of seed size and number are 0.25 x 10 to the -6th m and 3.0 x 10 to the 12th per kilogram of the gas. It is shown that this preexisting seed population is insufficient to influence the observed onset of homogeneous nucleation.
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