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Some Gasdynamic Problems in the Flow of Condensing Vapors

Marble, Frank E. (1969) Some Gasdynamic Problems in the Flow of Condensing Vapors. Astronautica Acta, 14 (6). pp. 585-613. ISSN 0004-6205.

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Some Gasdynamic Problems in the Flow of Condensing Vapors. The general problem of the flow of a wet vapor, with or without an inert diluent is formulated under the assumption that the liquid phase is finely divided and dispersed throughout the gaseous component in droplets whose radii are nearly constant in any local region. The processes of momentum transfer, heat transfer between phases are assumed to take place according to Stokes law and Nusselt number of unity, respectively. The mass transfer process is treated as diffusion governed in the presence of an inert diluent and kinetic governed for two phases of a pure substance. The physical understanding of such problems, in contrast with those of conventional gas dynamics, rests largely in the role played by the relaxation times or equilibration lengths associated with these three processes. Consequently, both simple and coupled relaxation processes are examined rather carefully by specific examples. Subsequently, the problem of near-equilibrium flow in a nozzle with phase change is solved under the small-slip approximation. The structure of the normal shock in a pure substance is investigated and reveals three rather distinct zones: the gasdynamic shock, the vapor relaxation zone, and the thermal and velocity equilibration zone. The three-dimensional steady flow of the two-phase condensing continuum is formulated according to first order perturbation theory, and the structure of waves in such supersonic flow is examined. Finally, the attenuation of sound in fogs is formulated and solved accounting for the important effects of phase change as well as the viscous damping and heat transfer which have been included in previous analyses.

Item Type:Article
Additional Information:© Pergamon Press 1969. Received 22 December 1968. This research was supported, in part, by the Aerospace Research Laboratories, Wright-Patterson Air Force Base, under contract AF33(615)-3587.
Group:Guggenheim Jet Propulsion Center
Funding AgencyGrant Number
Wright-Patterson Air Force BaseAF33(615)-3587
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Guggenheim Jet Propulsion CenterUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20101221-140000406
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21487
Deposited By: Ruth Sustaita
Deposited On:12 Jan 2011 18:20
Last Modified:03 Oct 2019 02:25

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