The use of the photoactivated nonintrusive tracking of molecular motion flow tagging technique to obtain quantitative velocity measurements in free falling water droplets and in electrohydrodynamic Taylor cones. A simple ray tracing procedure is outlined to remove the optical distorsion caused by the droplet surface curvature. This correction is applied to free falling droplet images, and the vertical component of velocity is measured across the droplet. Maximum vertical velocities in the droplet are 15.9 +/- 3.3 mm/s. Without ray tracing, the optical distortion is shown to cause errors in the sign of velocity as well as errors of over 100 % in velocity magnitude. Preliminary velocity measurements in a Taylor cone are also presented. Centerline velocities in the Taylor cone are approximately 4 micron/s.
Quantitative measurements of internal circulation in droplets using flow tagging velocimetry
Quantitative Messung der Innenzirkulation in Wassertröpfchen unter Anwendung der strömungsmarkierenden Geschwindigkeitsmessung
AIAA Journal ; 34 , 3 ; 449-454
1996
6 Seiten, 14 Bilder, 1 Tabelle, 17 Quellen
Article (Journal)
English
Zirkulation , Zirkulationsströmung , Strömungsvorgang , Strömungstechnik , Tropfen , Tropfengröße , Fallgeschwindigkeit , optisches Messgerät , optisches Messverfahren , Messfehler , Strömungsgeschwindigkeit , Wasserströmung , Raumfahrttechnik , Laserstrahl , Strömungsgeschwindigkeitsmesser , Strömungsgeschwindigkeitsmessung , Versuchsanlage , Elektrohydrodynamik , Strömungsvisualisierung
Quantitative Measurements of Internal Circulation in Droplets Using Flow Tagging Velocimetry
Online Contents | 1996
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