Reverse Washburn dynamics induces flow acceleration during capillary filling

We present a corollary to Washburn's equation in capillary dynamics. We show that, during capillary filling, in cases where flow path decreases with time, an accelerating capillary flow or reverse-Washburn flow regime occurs. We provide a description of this phenomenon following Washburn's...

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Bibliographic Details
Published in:Physics of fluids (1994) 2023-11, Vol.35 (11)
Main Authors: Castonguay, S., Temiz, Y., Delamarche, E., Gervais, T.
Format: Article
Language:English
Subjects:
Capillary flow
Fluid dynamics
Physics
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Summary:We present a corollary to Washburn's equation in capillary dynamics. We show that, during capillary filling, in cases where flow path decreases with time, an accelerating capillary flow or reverse-Washburn flow regime occurs. We provide a description of this phenomenon following Washburn's classic analysis and characterize a “reverse-Washburn” capillary flow regime in both inertial and viscous regimes. This regime is observed and characterized in experiments and numerical simulations of recently discovered self-coalescence flows, opening the door to engineering devices with naturally accelerating capillary inflows.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0163835