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Generation and Control of Tracer Particles for Optical Flow Investigation in Air

Kähler, Christian and Sammler, Bernd and Kompenhans, Jürgen (2004) Generation and Control of Tracer Particles for Optical Flow Investigation in Air. In: Particle Image Velocimetry: Recent Improvements Proceedings of the EUROPIV 2 workshop held in Zaragoza, Spain, March 31 - April 1, 2003, Proceedings of the EUROPIV 2 Workshop (Session 7). Springer-Verlag, Berlin, Heidelberg. pp. 417-426. ISBN 3-540-21423-2.

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Abstract

The production of mono-disperse tracer particles with suitable properties for optical flow investigations, such as small size, spherical shape, smooth surface, appropriate density and diffraction index, non-evaporating and agglomerating, electrically neutral, non-toxic and easily removable, is a challenging task due to the sensitivity of the particle size distribution to the boundary conditions. In order to obtain general design and operating rules for atomizers which are mostly applied for air flows, this dependence is investigated here. It is shown that high concentrations of narrow band particle size distributions, with a mean diameter below 1 lm, can easily be generated by means of multi-hole nozzles under overcritical pressure conditions, when the kinetic energy, transferred into the seeding liquid through the nozzle exits, is well balanced with the liquid volume inside the atomizer. In addition, flow visualization pictures are presented which permit a useful assessment of the functioning of the nozzles and reveal operating features of the atomizers which were not previously known. In particular, it is shown that existing explanations of the importance of certain design features of the Laskin nozzle are of minor importance for the generation of appropriate tracer particles.

Document Type:Contribution to a Collection
Additional Information: LIDO-Berichtsjahr=2004,
Title:Generation and Control of Tracer Particles for Optical Flow Investigation in Air
Authors:
AuthorsInstitution or Email of Authors
Kähler, ChristianTU-Braunschweig
Sammler, BerndUNSPECIFIED
Kompenhans, JürgenUNSPECIFIED
Date:2004
Journal or Publication Title:Particle Image Velocimetry: Recent Improvements
Refereed publication:Yes
In ISI Web of Science:No
Volume:Proceedings of the EUROPIV 2 Workshop
Page Range:pp. 417-426
Editors:
EditorsEmail
Stanislas, M.UNSPECIFIED
Westerweel, J.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Publisher:Springer-Verlag, Berlin, Heidelberg
Series Name:Proceedings of the EUROPIV 2 workshop held in Zaragoza, Spain, March 31 - April 1, 2003
ISBN:3-540-21423-2
Status:Published
Keywords:Optical fluid measurement technique, PIV, generation of tracer particles
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:14 Jun 2007
Last Modified:14 Jan 2010 19:37

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