Modelling of shear-driven liquid wall films: effect of accelerated air flow on the film flow propagation Online publication date: Mon, 10-May-2004
by J. Ebner, P. Schober, O. Schafer, R. Koch, S. Wittig
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 4, No. 3/4/5, 2004
Abstract: Liquid wall films that are driven by the shear stress exerted from a co-current air stream occur in many technical systems, e.g. in rocket nozzles, heat exchangers and on steam turbine blades. They are also present in prefilming airblast atomisers which are used for the fuel preparation in modern aviation gas turbines. In many cases, an acceleration of the co-current air flow is imposed in order to improve the performance or because of the geometrical constraints in complex configurations. The film flow characteristics are strongly influenced by the additional pressure gradient and the associated increase of the interfacial shear forces at the gas-liquid interface. In order to predict the two-phase flow field, a model has been developed at the Institut fur Thermische Stromungsmaschinen (ITS), University of Karlsruhe (TH) which allows a fully coupled computation of the gas flow field and the liquid film. In the present paper the modifications are discussed which are required to take into account the effect of an imposed pressure gradient in the air flow on the film flow dynamics. It will be shown that the numerical approach is capable to predict the film propagation with a high accuracy, providing a powerful tool for the design and the improvement of technical applications where liquid film phenomena play an important role.
Online publication date: Mon, 10-May-2004
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the Progress in Computational Fluid Dynamics, An International Journal (PCFD):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email email@example.com