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research-article

Feature Correlation Velocimetry for measuring instantaneous liquid sheet velocity

[+] Author and Article Information
Siddharth K.S.

Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India
sidacmiitm@gmail.com

Mahesh Panchagnula

Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India
mvp@iitm.ac.in

T.J. Tharakan

Liquid Propulsion Systems Centre, Indian Space Research Organization, Thiruvananthapuram 695547, India
tharakan12@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4036593 History: Received March 06, 2016; Revised March 22, 2017

Abstract

We describe a novel non-intrusive velocimetry technique for measuring the instantaneous velocity field on a liquid sheet. Short wavelength corrugations are naturally formed on the surface of a liquid sheet when the sheet interacts with ambient air. This method called Feature Correlation Velocimetry (FCV) relies on cross-correlation of such short wavelength corrugations visualized on the liquid sheet surface when captured using a high-speed camera. An experimental set-up was created for producing a liquid sheet of known thickness and velocity. After imaging the liquid sheet with a high-speed camera, cross-correlation was employed at various spatial locations on the liquid sheet. To examine the fidelity of the method, Laser Doppler Velocimetry (LDV) measurements were obtained for a range of flow rates at the same spatial locations and were compared with the FCV values. The FCV values were found to be consistently within 7% of the LDV readings with the FCV measurements being consistently less than those from the LDV. In order to examine the cause of the bias error, a theoretical model of the liquid sheet has been developed. Based on the model predictions, the bias error was observed to scale as U^(3/2), where U is the local instantaneous liquid sheet velocity. After correcting for this bias error, a good match was observed between the FCV and the LDV readings. As an application of the FCV method, the near nozzle region of an annular sheet exiting a spray injector has been characterized.

Copyright (c) 2017 by ASME
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