Sliding, vibrating and swinging droplets on an oscillating fibre

Poulain, Stéphane; Carlson, Andreas

doi:10.1017/jfm.2023.462

J. Fluid Mech.

2023

DOI: 10.1017/jfm.2023.462

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Sliding, vibrating and swinging droplets on an oscillating fibre

Stéphane Poulain

Andreas Carlson

Abstract: We study experimentally the dynamics of a water droplet on a tilted and vertically oscillating rigid fibre. As we vary the frequency and amplitude of the oscillations the droplet transitions between different modes: harmonic pumping, subharmonic pumping, a combination of rocking and pumping modes, and a combination of pumping and swinging modes. We characterize these responses and report how they affect the sliding speed of the droplet along the fibre. The swinging mode is explained by a minimal model making a… Show more

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2024

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Cited by 3 publications

References 47 publications

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Droplet Helical Motion on Twisted Fibers

Van Hulle,

Delforge,

Leonard

et al. 2024

Langmuir

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We investigate herein the impact of helical structures on the motion of asymmetrical droplets along vertically twisted fibers. The droplet adopts helical motion around the bundle driven by gravity. This complex motion can be manipulated by varying the twists turns of the fibers. When the droplet size is smaller than the characteristic length of the helix (pitch), the droplet adopts a predominant helical motion correlated to the groove of the twisted fibers. When the droplet size exceeds the pitch length, a mixed motion of intermittent vertical sliding and helical movement emerges. A model describes rotational and linear speeds as a function of the number of fiber twist turns. This research highlights the profound role of substructures in droplet dynamics, offering fresh insight into droplet manipulation or fiber-based devices.

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Droplet Helical Motion on Twisted Fibers

Van Hulle,

Delforge,

Leonard

et al. 2024

Langmuir

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Experimental and numerical investigation of droplet–fiber interaction on mechanically excited fiber

Schwarzwaelder,

Freese,

Meyer

et al. 2024

Physics of Fluids

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In this study, for the first time, the droplet–fiber interaction on a mechanically excited fiber is examined in the direction of the fiber axis. Highly spatially and temporally resolved simulations and experimental investigations provide information on the relative position of the center of the projected area of the droplet and the center of the fiber, the relative angular position, and the deformation of the droplet using a skeleton line. To attain this, a state-of-the-art camera technology was employed in the experiments, while the volume of fluid method was utilized for the modeling of the multi-phase flow. Additionally, an overset method for the movement of the fiber was applied in the computational fluid dynamics simulations. Characteristic motion patterns, whether occurring in isolation, in sequence, or superimposed, are identified, representing a prerequisite for the detachment of the droplet from the fiber. Despite the simplified assumption of a two-dimensional simulation, the motion patterns observed in the simulation are in good agreement with the experimental data. The obtained results contribute to a fundamental understanding of the mechanisms responsible for the detachment of a droplet in the context of the droplet–fiber interaction within the excited coalescence filters.

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Twisted fibers enable drop flow control and enhance fog capture

Kern,

Carlson

2024

Proc. Natl. Acad. Sci. U.S.A.

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Drop–fiber interactions are fundamental to the operation of technologies such as atmospheric fog capture, oil filtration, refrigeration, and dehumidification. We demonstrate that by twisting together two fibers, a sliding drop’s flow path can be controlled by tuning the ratio between its size and the twist wavelength. We find both experimentally and numerically that twisted fiber systems are able to asymmetrically stabilize drops, both enhancing drop transport speeds and creating a rich array of new flow patterns. We show that the passive flow control generated by twisting fibers allows for woven nets that can be “programmed” with junctions that predetermine drop interactions and can be anticlogging. Furthermore, it is shown that twisted fiber structures are significantly more effective at capturing atmospheric fog compared to straight fibers.

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Sliding, vibrating and swinging droplets on an oscillating fibre

Cited by 3 publications

References 47 publications

Droplet Helical Motion on Twisted Fibers

Droplet Helical Motion on Twisted Fibers

Experimental and numerical investigation of droplet–fiber interaction on mechanically excited fiber

Twisted fibers enable drop flow control and enhance fog capture

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