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Friction Coefficient of an Intact Free Liquid Jet Moving in Air

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posted on 25.06.2018 by P.M. Comiskey, A.L. Yarin
Here, we propose a novel method of determining the friction coefficient of intact free liquid jets moving in quiescent air. The middle-size jets of this kind are relevant for such applications as decorative fountains, fiber-forming, fire suppression, agriculture, and forensics. The present method is based on measurements of trajectories created using a straightforward experimental apparatus emulating such jets at a variety of initial inclination angles. Then, the trajectories are described theoretically, accounting for the longitudinal traction imposed on such jets by the surrounding air. The comparison of the experimental data with the theoretical predictions shows that the results can be perfectly superimposed with the friction coefficient Cfd = 5Red−1∕2±0.05, in the 621 ⩽ Red ⩽ 1289 range, with Red being the Reynolds number based on the local cross-sectional diameter of the jet. The results also show that the farthest distance such jets can reach corresponds to the initial inclination angle 훼 = 35◦ which is in agreement with already published data.

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Funding

This work was financially supported by the US National Institute of Justice (NIJ 2017-DN-BX-0171).

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Publisher Statement

Post print version of article may differ from published version. The final publication is available at springerlink.com; DOI: 10.1007/s00348-018-2519-y

Citation

Comiskey, P. M. and Yarin, A. L. Friction coefficient of an intact free liquid jet moving in air. Experiments in Fluids. 2018. 59(4). 10.1007/s00348-018-2519-y.

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Springer Verlag

Language

en_US

issn

0723-4864

Issue date

17/03/2018

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