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A review of at rest droplet growth equations for condensing nitrogen in transonic cryogenic wind tunnels (1979)

Hall, R. M. ; Kramer, S. A.

In: CASI

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Publication Date: 2019-06-27

Description: Droplet growth equations are reviewed in the free-molecular, transition, and continuum flow regimes with the assumption that the droplets are at rest with respect to the vapor. As comparison calculations showed, it was important to use a growth equation designed for the flow regime of interest. Otherwise, a serious over-prediction of droplet growth may result. The growth equation by Gyarmathy appeared to be applicable throughout the flow regimes and involved no iteration. His expression also avoided the uncertainty associated with selecting a mass accommodation coefficient and consequently involved less uncertainty in specifying adjustable parameters than many of the other growth equations.

Keywords: AERODYNAMICS

Type: NASA-TM-78821

Format: application/pdf

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