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DY: Dynamik und Statistische Physik

DY 41: Granular matter I

DY 41.3: Vortrag

Donnerstag, 27. März 2003, 10:30–10:45, G\"OR/229

Experiments and simulation of charged particle sprays — •Tom Winkels, Micha-Klaus Müller, and Stefan Luding — Particle Technology, DCT, TUDelft, NL

When a fluid is pressed through a charged capillary, one obtains a cone instead of a liquid droplet. The cone tip leads to a stream of liquid that is unstable and breaks into droplets. This method is the so-called EHDA (electro hydrodynamic atomisation) with applications in medicine, agriculture, pharmacy and many more.

The experimental spray is examined with a phase doppler setup and the resulting density and velocity profiles are compared to numerical simulations of a spray in an indetical geometry.

The most important result is a scale-up relation, that allows to simulate an experimental spray with millions of particles, using only a few thousand model particles. The qualitative agreement between experiment and model is reasonable but, more quantitatively, the interaction between the gas and the droplets is not yet satisfactorily described in the model.

Future challenges involve advanced algorithms for the modeling of long-range interactions (like Coulomb repulsion) in order to reduce the numerical effort and to allow for large-scale sprays.