Modelling polydispersed droplet spectra in nucleating steam flows

White, A. J.; Hounslow, M. J.
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p499
Academic Journal
The nucleation processes occurring within steam turbine and moist air flows often lead to the formation of a polydispersion of liquid droplets for which droplet sizes encompass several orders of magnitude. This paper outlines a method for modelling such size distributions for condensing steam flow. The method uses a moment representation of the size spectra, rather than the more traditional approach of discretising the continuous range of droplet radii. Results for primary and secondary nucleating flows are presented and show very good agreement with discrete spectrum calculations, but require much less computing time. A further advantage of the method is that the equations may be cast in an Eulerian frame of reference, thereby facilitating the development of three-dimensional and unsteady computational methods for condensing flow.


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