Solution of the general dynamic equation along approximate fluid trajectories generated by the method of moments

Hagmeijer, Rob and IJzermans, Rutger H.A. and Put, Frits (2005) Solution of the general dynamic equation along approximate fluid trajectories generated by the method of moments. Physics of Fluids , 17 (5). 056101. ISSN 1070-6631

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Abstract:	We consider condensing flow with droplets that nucleate and grow, but do not slip with respect to the surrounding gas phase. To compute the local droplet size distribution, one could solve the general dynamic equation and the fluid dynamics equations simultaneously. To reduce the overall computational effort of this procedure by roughly an order of magnitude, we propose an alternative procedure, in which the general dynamic equation is initially replaced by moment equations complemented with a closure assumption. The key notion is that the flow field obtained from this so-called method of moments, i.e., solving the moment equations and the fluid dynamics equations simultaneously, approximately accommodates the thermodynamic effects of condensation. Instead of estimating the droplet size distribution from the obtained moments by making assumptions about its shape, we subsequently solve the exact general dynamic equation along a number of selected fluid trajectories, keeping the flow field fixed. This alternative procedure leads to fairly accurate size distribution estimates at low cost, and it eliminates the need for assumptions on the distribution shape. Furthermore, it leads to the exact size distribution whenever the closure of the moment equations is exact.
Item Type:	Article
Copyright:	© 2005 American Institute of Physics
Faculty:	Engineering Technology (CTW)
Research Group:	Engineering Fluid Dynamics (EFD)
Link to this item:	http://purl.utwente.nl/publications/54056
Official URL:	http://dx.doi.org/10.1063/1.1921147
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