Hydrodynamik von Spray/Wand Interaktion
Zusammenfassung der Projektergebnisse
The proposed research was aimed at the experimental and theoretical / numerical investigation of the hydrodynamics of drop and spray impact onto a rigid target. The specific aim of the project focused on the description of the wall film flow generated by single drop impact onto steady and wavy liquid wall films and in the prediction of the spray impact behavior in relation to the wall film topology. The results are essential for the correct modelling of heat transfer associated with spray impact (e. g. in application to spray cooling) and in the description of the quality of spray coating processes. The study is a necessary step towards the modelling of inclined spray impact, relevant to most practical applications. Within the framework of this project a three-dimensional, two-component (3D-2C) micro-PIV system was designed and tested, with which the wall film flow could be characterized. This system is based on a combination of a micro-PlV system with laser induced fluorescence and uses two optical abberations (astigmatism and the spherical abberation) to measure the velocity profile in the wall film. The phenomena were modeled using an advanced free-surface capturing model based on the two-fluid formulation of the classical Volume-of-Fluid method. The results are used for the theoretical modelling of the velocity field in the wall film and its fluctuations.
Projektbezogene Publikationen (Auswahl)
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2007. An experimental study of the crater evolution by impact of a drop onto a shallow pool. 21st Annual Conference on Liquid Atomization and Spray Systems. Mugia, Turkey, 2007, 6 pages.
van Hinsberg, N. R, Roisman, I. V., Tropea, C.
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2007. Wall flow produced by spray impact. EUROMECH 493, Interface dynamics. Stability and Fragmentation. Grenoble, France
Roisman, I. V., van Hinsberg, N. R, Kyriopoulos, O., Tropea, C., Gambaryan-Roisman, T., Stephan, P.
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2008. Complementary experimental and computational study of
a drop impacting a shallow pool. 22nd Annual Conference on Liquid
Atomization and Spray Systems. Como, Italy
van Hinsberg, N. P, Berberovic, E., Roisman, 1. V., Jakirli', S., Tropea, C.
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2008. Propagation of a kinematic instability in a liquid layer: Capillary and gravity effects. Physical Review E, Vol. 77. 2008, Issue 4, 046305.
Roisman, I. V., van Hinsberg, N. R, Tropea, G.
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2009 Inertia dominated drop collisions I: on the universal shape of the lamella. Physics of Fluids, Vol. 21. 2009, Issue 5, 052103.
Roisman, I. V., Berberovic, E., Tropea, C.
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2009. An experimental study of the crater evolution by impact of a drop onto a fluctuating shallow pool. Proceedings of the 11th Int. Conf. on Liquid Atomization and Spray Systems. Vail, Colorado, USA, 2009, page 21.
van Hinsberg, N. R, Roisman, I. V., Tropea, C.
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2009. Drop impact onto a liquid layer of finite thickness: Dynamics
of the cavity evolution. Physical Review E, Vol. 79.2009, Issue 3, 036306.
Berberovic, E., van Hinsberg, N. P., Jakirlic, S., Roisman, I. V., Tropea, 0.
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2009. Dynamics of the Cavity Generated in a Liquid Film by Drop Impact. Proceedings of the 11th Int. Conf. on Liquid Atomization and Spray Systems. Vail, Colorado, USA, 2009, page 44.
Budakli, M., Gambaryan-Roisman, T, van Hinsberg, N. R, Roisman, 1. v., Stephan, P., Tropea, C.
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2010. Dynamics of the cavity and the surface film for impingements of single drops on liquid films of various thicknesses. Journal of Colloid and Interface Science, Vol. 350. 2010, Issue 1, pp. 336–343.
van Hinsberg, N. P., Budakli, M., Berberovic, E., Roisman, I. V., Gambaryan-Roisman, T., Tropea, C, Stephan, P.
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2010. Investigation of drop and spray impingement on a thin liquid layer accounting for the wall film topology. Forschungsberichte Strömungslehre und Aerodynamik, Bd. 23, Shaker Verlag , Aachen, zugl.: Darmstadt, Techn. Univ., Dissertation, 2009, ISBN 978-3-8322-8956-0, 346 S.
van Hinsberg, N.P.
