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Interfacial oscillation of liquid jets discharging from non-circular orifices

Rajesh, KR and Sakthikumar, R and Sivakumar, D (2016) Interfacial oscillation of liquid jets discharging from non-circular orifices. In: INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 87 . pp. 1-8.

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Official URL: http://dx.doi.org/10.1016/j.ijmultiphaseflow.2016....

Abstract

This work presents an experimental study on the oscillation behavior of liquid jets discharging from elliptical, triangular, and square shaped non-circular orifices. The measurements of wavelength and amplitude of jet oscillation are extracted from digital images of the liquid jets captured via still photography technique at different flow conditions using three different liquids (pure water, water-glycerol mixture, and Jet A-1 fuel). The measured wavelength of jet oscillation (lambda), irrespective of the shape geometry of the tested non-circular orifices, increases linearly with increase in liquid jet velocity (U-o) and scales with the liquid jet Weber number (We) as lambda/D-eq alpha We(0.5). The experimental measurements of lambda recorded at different flow conditions exhibit good agreement with the theoretical predictions obtained using the mathematical model proposed by Rayleigh (1879) for liquid jet undulating in its cross section. For a given U-o, the liquid jet of Jet A-1 displays higher value of lambda and undergoes a larger increase in lambda along the axis of the jet compared to the jets of other two liquids. Further the trends on the variation of maximum and minimum amplitudes of the first wave segment of liquid jets discharging from the elliptical and square orifices with U-o are discussed. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
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Date Deposited: 07 Dec 2016 04:37
Last Modified: 07 Dec 2016 04:37
URI: http://eprints.iisc.ernet.in/id/eprint/55453

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