Interaction phenomena between liquid droplets and hot particles—Captured via high-speed camera--颗粒学报PARTICUOLOGY

Gehrke, S., & Wirth, K.-E. (2009). Interaction phenomena between liquid droplets and hot particles—Captured via high-speed camera. Particuology, 7(4), 260–263. https://doi.org/10.1016/j.partic.2009.04.001

Interaction phenomena between liquid droplets and hot particles—Captured via high-speed camera

Sebastian Gehrke, Karl-Ernst Wirth^*

Institute of Particle Technology, Cauerstrasse 4, Erlangen 91058, Germany

10.1016/j.partic.2009.04.001

Volume 7, Issue 4, August 2009, Pages 260-263

Received 3 November 2008, Accepted 15 April 2009, Available online 9 July 2009.

E-mail: K.E.Wirth@lfg.uni-erlangen.de

Highlights

Abstract

The interaction of evaporating droplets and hot catalyst particles plays a major role in heterogeneously catalysed reactions. The liquid feed is injected into a gas–solid flow and is mixed with the catalyst. The interaction phenomena determine the evaporation time which should be minimised to keep the reactor vessel small. First measurements with a bed of fixed hot FCC-particles (fluid catalytic cracking) and two model fluids have been conducted. The interactions of ethanol and water droplets with the hot bed surface were captured via a high-speed camera. While the ethanol droplet developed a stable steam cushion due to Leidenfrost phenomena, water showed intense interaction and steam explosions which induced repulsion and atomisation of the droplet.

Graphical abstract

Keywords

Particle–droplet-interaction; Leidenfrost phenomenon; Direct heat transfer; Liquid-feed-injection

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