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From low velocity droplet impact to high velocity particle impact

Rein, Martin (2007) From low velocity droplet impact to high velocity particle impact. CIRF Seminar Series, 2007-10-10, Santa Barbara, CA (USA).

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Fluid dynamic processes occurring during the impact of a droplet onto the surface of a pool are surveyed. First, phenomena characteristic of low velocity impacts such as the formation of vortex rings, the importance of capillarity, bubble entrainment and jetting are considered. Furthermore, a connection between critical conditions of bubble entrainment by drop impact and critical conditions of the inception of self-entrainment of high-velocity turbulent open-channel flows will be addressed. Compressibility effects that become dominant at high impact velocities are considered next. After impact, pressure waves propagating within the droplet may result in the formation of cavitation bubbles. The inception of cavitation is modelled by a microbubble model. At very high velocities the resulting high impact pressures can cause impinging solid metal particles to stick to a metal surface. This is exploited in the cold spray coating process. Finally, the emission of light that is sometimes observed when metallic particles impinge on a metal plate with a high velocity is traced to mechanoluminescence.

Item URL in elib:https://elib.dlr.de/52746/
Document Type:Conference or Workshop Item (UNSPECIFIED)
Title:From low velocity droplet impact to high velocity particle impact
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:10 October 2007
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:vortex rings, capillarity, air entrainment, bubbles, cavitation, shock waves, free surface turbulence, cold spray, mechanoluminescence
Event Title:CIRF Seminar Series
Event Location:Santa Barbara, CA (USA)
Event Type:Other
Event Dates:2007-10-10
Organizer:The Center for Interdisciplinary Research in Fluid Physics, University of California Santa Barbara
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Rein, Prof.Dr. Martin
Deposited On:16 Jan 2008
Last Modified:27 Apr 2009 14:38

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