Abstract
This study experimentally investigated the axis switching of free-falling water jets issued from an elliptical nozzle with an aspect ratio of 1.6. High-speed photography was used to capture the flow behaviors. The axis-switching wavelength of the elliptical jets was found growing with the falling distance while its amplitude was decaying. The variation of the jet cross-sectional area could be estimated based on free-falling velocity. An increasing axis-switching frequency with the falling distance was observed in the experiments and was estimated by introducing a correction factor for the gravity effect into Rayleigh’s equation. Finally, an estimation method for the axis switching of elliptical water jets was developed and the predictions compared well with the experimental measurements.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (experimental measurements).
Acknowledgments
The writers gratefully acknowledge financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada, the Fundamental Research Funds for the Central Universities, Key Research and Development Program of Zhejiang (2020C03082), and the National Natural Science Foundation of China (Grant No. 51579150). The authors also would like to thank Perry Fedun for his technical assistance.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 9, 2019
Accepted: Jan 13, 2020
Published online: Apr 21, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 21, 2020
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