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Generation and Control of Particle size distributions for Optical Velocity Measurement Techniques in Fluid Mechanics

Kähler, C. and Sammler, B. and Kompenhans, J. (2001) Generation and Control of Particle size distributions for Optical Velocity Measurement Techniques in Fluid Mechanics. 4th International Symposium on Particle Image Velocimetry, Göttingen, Germany, September 17-19, 2001.

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Abstract

It is shown in the paper that high concentrations of narrow band particle size distributions with a mean diameter below one micrometer can be easily generated by means of multi hole nozzles under over-critical pressure conditions (>1 bar) provided the kinetic energy, entering the liquid volume, is above a certain value. This experimental result can be explained by assuming that the nozzle has basically three functions. Firstly, it generates the particles at the nozzle exit. Secondly, it changes the fluid mechanical state of the fluid into a two phase liquid which seems to promote the generation of smaller particle size distributions as the fluid mechanical parameters are different. Thirdly, the remaining kinetic energy which is not consumed for the generation of the particles or the transition of the fluid mechanical state is transfered into the turbulent motion of the liquid and may act as an active impactor as the shearing of the bubbles which carry the particles to the liquid surface is enhanced. Beside this result it could be qualitative shown that bubbles arise from the liquid fed holes of the Laskin nozzle. This implies that no particles can be generated at the ring side of the jet, in contrast to the existing literature.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2003,
Title:Generation and Control of Particle size distributions for Optical Velocity Measurement Techniques in Fluid Mechanics
Authors:
AuthorsInstitution or Email of Authors
Kähler, C.UNSPECIFIED
Sammler, B.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Date:2001
Page Range:8Seiten-
Status:Published
Keywords:Tracer particle, seeding generator, Laskin nozzle, suction nozzle, smoke generator, particle size distributions
Event Title:4th International Symposium on Particle Image Velocimetry, Göttingen, Germany, September 17-19, 2001
Organizer:AS-EV
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Flight Physics
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Ilka Micknaus
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:15

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