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Optical Engineering

High-speed imaging optical techniques for shockwave and droplets atomization analysis
Author(s): Pierre R. Slangen; Pierre Lauret; Frederic Heymes; Laurent Aprin; Nicolas Lecysyn
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Paper Abstract

Droplets atomization by shockwave can act as a consequence in domino effects on an industrial facility: aggression of a storage tank (projectile from previous event, for example) can cause leakage of hazardous material (toxic and flammable). As the accident goes on, a secondary event can cause blast generation, impacting the droplets and resulting in their atomization. Therefore, exchange surface increase impacts the evaporation rate. This can be an issue in case of dispersion of such a cloud. The experiments conducted in the lab generate a shockwave with an open-ended shock tube to break up liquid droplets. As the expected shockwave speed is about 400  m/s (∼Mach  1.2), the interaction with falling drops is very short. High-speed imaging is performed at about 20,000 fps. The shockwave is measured using both overpressure sensors: particle image velocimetry and pure in line shadowgraphy. The size of fragmented droplets is optically measured by direct shadowgraphy simultaneously in different directions. In these experiments, secondary breakups of a droplet into an important number of smaller droplets from the shockwave-induced flow are shown. The results of the optical characterizations are discussed in terms of shape, velocity, and size.

Paper Details

Date Published: 20 June 2016
PDF: 7 pages
Opt. Eng. 55(12) 121706 doi: 10.1117/1.OE.55.12.121706
Published in: Optical Engineering Volume 55, Issue 12
Show Author Affiliations
Pierre R. Slangen, Mines Alès (France)
Pierre Lauret, Mines Alès (France)
Frederic Heymes, Mines Alès (France)
Laurent Aprin, Mines Alès (France)
Nicolas Lecysyn, CEA Gramat (France)

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