2018
DOI: 10.1103/physrevlett.120.084501
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Forced Wetting Transition and Bubble Pinch-Off in a Capillary Tube

Abstract: Immiscible fluid-fluid displacement in partial wetting continues to challenge our microscopic and macroscopic descriptions. Here, we study the displacement of a viscous fluid by a less viscous fluid in a circular capillary tube in the partial wetting regime. In contrast with the classic results for complete wetting, we show that the presence of a moving contact line induces a wetting transition at a critical capillary number that is contact angle dependent. At small displacement rates, the fluid-fluid interfac… Show more

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Cited by 66 publications
(37 citation statements)
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“…1), the ratio of which determines the apparent contact angle as θap = 2hr /w ≈ 30 • , which is small enough for the long-wave approximation to be valid (40,41). This observation is further confirmed in our earlier work, showing an excellent match between the experimentally observed profiles and the theoretical prediction (37). Of course, the longwave approximation ultimately breaks down as the slope of the meniscus near the point of singularity diverges, leading to a crossover to the late-time self-similar regime.…”
Section: Applied Physical Sciencessupporting
confidence: 85%
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“…1), the ratio of which determines the apparent contact angle as θap = 2hr /w ≈ 30 • , which is small enough for the long-wave approximation to be valid (40,41). This observation is further confirmed in our earlier work, showing an excellent match between the experimentally observed profiles and the theoretical prediction (37). Of course, the longwave approximation ultimately breaks down as the slope of the meniscus near the point of singularity diverges, leading to a crossover to the late-time self-similar regime.…”
Section: Applied Physical Sciencessupporting
confidence: 85%
“…1). This can be analyzed using a long-wave approximation (37), which assumes that the flow is mainly parallel to the tube axis. Near the point of pinch-off, we postulate that the shape of the profile becomes self-similar:R(ξ) =r (z ,τ )/τ α , and ξ = (z −z0)/τ β with α and β as constants ( Fig.…”
Section: Applied Physical Sciencesmentioning
confidence: 99%
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“…Thin Films and Corner Flow. The complex nature of interfacial flows in the presence of solid surfaces lends an inherently 3D nature to fluid-fluid displacement processes, even in quasi-1D geometries such as capillary tubes (48) and quasi-2D geometries such as Hele-Shaw cells (46). In a patterned micromodel, these 3D effects include the propagation of thin films along the top and bottom walls and the surfaces of the posts, and in the corners where the walls and posts meet (2,47).…”
Section: Si-icmentioning
confidence: 99%
“…The complicated geometry of pores and throats in the medium renders the problem too demanding from the numerical point of view and analytical solutions are only available for very simple geometries [44]. In order to develop a reasonable growth model, one has to understand the basic mechanisms behind the pore-scale dynamics [26], including effects from the contact line dynamics [45], and how those mechanisms interact to yield the macroscopic properties of the flow. Understanding the relative importance of nontrivial flow mechanisms such as film flow is important to allow a precise judgment on whether or not a given flow condition can be appropriately described by a growth model such as IP or DLA (both models, in their standard formulations, do not incorporate film flow phenomena).…”
Section: Introductionmentioning
confidence: 99%