Scaling analysis of the Plateau–Rayleigh instability in thin film flow down a fiber

Gabbard, Chase; Bostwick, Joshua

doi:10.1007/s00348-021-03234-3

Cited by 8 publications

(1 citation statement)

References 38 publications

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“…2020), fibre shape (Xie et al. 2021), fluid properties (Smolka, North & Guerra 2008; Gabbard & Bostwick 2021 b ) and slip (Haefner et al. 2015) on bead-on-fibre patterns.…”

Section: Introductionmentioning

confidence: 99%

Bead-on-fibre morphology in shear-thinning flow

Gabbard

Bostwick

2023

J. Fluid Mech.

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Thin-film flow down a fibre exhibits rich dynamics and is relevant to applications such as desalination, fibre coating and fog harvesting. These flows are subject to instabilities that result in dynamic bead-on-fibre patterns. We perform an experimental study of shear-thinning flow down fibres using 20 different xanthan gum solutions as our working liquid. The bead-on-fibre morphology can be oriented either symmetrically or asymmetrically on the fibre, and this depends upon the surface tension, fibre diameter and liquid rheology, as defined by the Ostwald power-law index. For highly shear-thinning liquids, it is possible for the pattern to be complex and exhibit simultaneously both asymmetric large beads and symmetric small beads in the isolated and convective flow regimes. We quantify the transition between flow regimes and bead dynamics for the asymmetric morphology, and compare with Newtonian flow, as it depends upon the experimental parameters. Finally, the dimensionless bead frequency is shown to scale with the Bond number for all of our experimental data (symmetric and asymmetric).

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“…2020), fibre shape (Xie et al. 2021), fluid properties (Smolka, North & Guerra 2008; Gabbard & Bostwick 2021 b ) and slip (Haefner et al. 2015) on bead-on-fibre patterns.…”

Section: Introductionmentioning

confidence: 99%

Bead-on-fibre morphology in shear-thinning flow

Gabbard

Bostwick

2023

J. Fluid Mech.

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Progresses and Perspectives of 1D Soft Sensing Devices for Healthcare Applications

Kim,

Lee

et al. 2024

Adv Funct Materials

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Healthcare sensing devices enable continuous monitoring of diverse biosignals, such as respiration, heartbeat, temperature, inflammation, Electroencephalogram (EEG), and biomechanical movement, contributing to the management of health conditions and early diagnosis of diseases. However, clinically available tools have several limitations for real‐time measurement of biosignals in non‐hospital environments owing to their cumbersome, complex designs, and rigidity. To address these limitations, there has been a growing body of research that explores flexible and soft electronics for healthcare applications, which feature high mechanical compliance and adaptability. Especially, sensing devices based on fiber structures have attracted significant attention due to high flexibility, lightweight design, effective workspace and unique structural adaptability. Moreover, 1D sensing devices can be seamlessly integrated into garments and the human body with complex structures without any unconformity. In this perspective, The fabrication and electrical functionalization of fiber substrates and focus on recent advances in various fiber‐based sensing systems for strain, pressure, temperature, pH, biomarkers, and neural activity is explored. Additionally, biodegradable fiber‐based sensing devices as future healthcare technologies are briefly discussed. Finally, this article provides a summary and outlook on the remaining challenges for current fiber‐based sensing devices.

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Continuous Homogeneous Thin Liquid Film on a Single Cross‐Shaped Profiled Fiber with High Off‐Circularity: Toward Quick‐Drying Fabrics

Xu,

Shi,

et al. 2024

Advanced Materials

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Quick‐drying fabrics, renowned for their rapid sweat evaporation, have witnessed various applications in strenuous exercise. Profiled fiber textiles exhibit enhanced quick‐drying performance, which is attributed to the excellent wicking effect within fibrous bundles, facilitating the rapid transport of sweat. However, the evaporation process is not solely influenced by macroscopic liquid transport but also by microscopic liquid spreading on the fibers where periodic liquid knots induced by spontaneous fluidic instability significantly reduce the evaporation area. Here, a cross‐shaped profiled fiber with high off‐circularity, featured as multiple concavities along the fibrous longitude‐axis, which enables the formation of a homogeneous thin liquid film on a single fiber without any periodic liquid knots, is developed. The high off‐circularity cross‐sections help overcoming Plateau–Rayleigh instability by tuning the Laplace pressure difference, further facilitated by capillary flow along the concave surface. The homogeneous thin liquid film on a single fiber is responsible for maximizing the evaporation area, resulting in excellent overall evaporation capacity. Consequently, fabrics made from such fibers exhibit rapid evaporation behavior, with evaporation rates ≈50% higher than those of cylindrical fabrics. It is envisioned that profiled fibers may provide inspiration for the manipulating homogeneous liquid films for applications in fluid coatings and functional textiles.

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Scaling analysis of the Plateau–Rayleigh instability in thin film flow down a fiber

Cited by 8 publications

References 38 publications

Bead-on-fibre morphology in shear-thinning flow

Bead-on-fibre morphology in shear-thinning flow

Progresses and Perspectives of 1D Soft Sensing Devices for Healthcare Applications

Continuous Homogeneous Thin Liquid Film on a Single Cross‐Shaped Profiled Fiber with High Off‐Circularity: Toward Quick‐Drying Fabrics

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