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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Analysis of spray formation in a confined spray process for powder production

pages 914-925
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.970
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SINOPSIS

The tailoring of the particle and powder properties that are produced within spray processes is influenced by various unsteady transport processes in the dispersed multiphase spray flow in a confined spray chamber. In this context differently scaled spray structures in a confined spray environment have been analyzed experimentally and numerically. The basic setup of the study consists of a twin-fluid atomizer central top-spraying in a confined spray chamber, where the atomizer gas can be heated up to 500°C. Mixing phenomena of momentum, energy and species play an even bigger role for this hot-gas atomization and drying process than in a conventional tall form spray dryer. The experimental investigations have been carried out with Particle-Image-Velocimetry to determine the kinetic data of the gas and the discrete phase. Additionally Large-Eddy-Simulations have been set up to predict the transient behaviour of the process and give more insight into the sensitivity of the droplet-gas interactions.

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