CUED Publications database

Velocity profiles in a cylindrical liquid jet by reconstructed velocimetry

Castrejón-Pita, JR and Hoath, SD and Hutchings, IM (2012) Velocity profiles in a cylindrical liquid jet by reconstructed velocimetry. Journal of Fluids Engineering, Transactions of the ASME, 134. ISSN 0098-2202

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Abstract

An experimental setup and a simple reconstruction method are presented to measure velocity fields inside slightly tapering cylindrical liquid jets traveling through still air. Particle image velocimetry algorithms are used to calculate velocity fields from high speed images of jets of transparent liquid containing seed particles. An inner central plane is illuminated by a laser sheet pointed at the center of the jet and visualized through the jet by a high speed camera. Optical distortions produced by the shape of the jet and the difference between the refractive index of the fluid and the surrounding air are corrected by using a ray tracing method. The effect of the jet speed on the velocity fields is investigated at four jet speeds. The relaxation rate for the velocity profile downstream of the nozzle exit is reasonably consistent with theoretical expectations for the low Reynolds numbers and the fluid used, although the velocity profiles are considerably flatter than expected. © 2012 American Society of Mechanical Engineers.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:29
Last Modified: 16 Dec 2014 19:06
DOI: 10.1115/1.4005669