QUANTITATIVE MEASUREMENTS OF INTERNAL CIRCULATION IN DROPLETS USING FLOW TAGGING VELOCIMETRY

Citation
Sr. Harris et al., QUANTITATIVE MEASUREMENTS OF INTERNAL CIRCULATION IN DROPLETS USING FLOW TAGGING VELOCIMETRY, AIAA journal, 34(3), 1996, pp. 449-454
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aerospace Engineering & Tecnology
Journal title
AIAA journal → ACNP
ISSN journal
0001-1452
Volume
34
Issue
3
Year of publication
1996
Pages
449 - 454
Database
ISI
SICI code
0001-1452(1996)34:3<449:QMOICI>2.0.ZU;2-2
Abstract
We demonstrate the use of the photoactivated nonintrusive tracking of molecular motion flow tagging technique to obtain quantitative velocit y measurements in free falling water droplets and in electrohydrodynam ic Taylor cones. A simple ray tracing procedure is outlined to remove the optical distortion caused by the droplet surface curvature. This c orrection 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 veloci ty as well as errors of over 100% in velocity magnitude. Preliminary v elocity measurements in a Taylor cone are also presented. Centerline v elocities in the Taylor cone are approximately 4 mu/s.