elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

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

Kähler, C. und Sammler, B. und 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.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen: LIDO-Berichtsjahr=2003,
Titel:Generation and Control of Particle size distributions for Optical Velocity Measurement Techniques in Fluid Mechanics
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Kähler, C.NICHT SPEZIFIZIERT
Sammler, B.NICHT SPEZIFIZIERT
Kompenhans, J.NICHT SPEZIFIZIERT
Datum:2001
Seitenbereich:
Status:veröffentlicht
Stichwörter:Tracer particle, seeding generator, Laskin nozzle, suction nozzle, smoke generator, particle size distributions
Veranstaltungstitel:4th International Symposium on Particle Image Velocimetry, Göttingen, Germany, September 17-19, 2001
Veranstalter :AS-EV
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ST - Starrflüglertechnologien
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Köln-Porz , Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik
Hinterlegt von: Ilka Micknaus
Hinterlegt am:31 Jan 2006
Letzte Änderung:14 Jan 2010 19:15

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.