Evaporation-induced evolution of the capillary force between two grains

Mielniczuk, Bolesław; Hueckel, Tomasz; Youssoufi, Moulay Saı̈d El

doi:10.1007/s10035-014-0512-6

Cited by 32 publications

(61 citation statements)

References 59 publications

(108 reference statements)

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“…The evolution of contact angle (hysteresis), pinning, de-pinning and re-pinning of the contact line are reported by Mielniczuk et al [1], but are not considered in Laplace-Young law and in the expression for the Laplace pressure. However, as seen, they heavily affect the evolution of Laplace pressure.…”

Section: Introductionmentioning

confidence: 99%

“…The main dynamic data from our recent experiments (see [1] for details) are synthetized in Fig. 2a and b, visualizing the total measured capillary force, F CAP-m against the current volume of the liquid bridge and separation between the spheres.…”

Section: Experimental Inputmentioning

confidence: 99%

“…2a and b, visualizing the total measured capillary force, F CAP-m against the current volume of the liquid bridge and separation between the spheres. A description of the experimental conditions is provided by [1].…”

Section: Experimental Inputmentioning

confidence: 99%

“…Evaporating capillary bridges between two glass spheres at fixed separations revealed in recent isothermal experiments characteristic patterns of their evolution during liquid evaporation [1]. That includes total mass-evaporation rate, average evaporation flux, evolution of geometric characteristics, such as the radius of bridge gorge, central external radius, angles and radii of contact, and evolution of capillary force.…”

Section: Introductionmentioning

confidence: 99%

“…The variables include: average Laplace pressure, pressure resulting force, surface tension force and total capillary force calculated based on the previously reported geometrical variables using Young-Laplace law [1,2]. This is the first time to our knowledge that Laplace pressure is calculated from the measured bridge curvatures along the process of evaporation and compared to experimental measurement data.…”

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confidence: 99%

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Laplace pressure evolution and four instabilities in evaporating two-grain liquid bridges

2015

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Dynamic variables characterizing evolution during evaporation of capillary bridge between two spheres are analyzed. The variables include: average Laplace pressure, pressure resulting force, surface tension force and total capillary force calculated based on the previously reported geometrical variables using Young-Laplace law [1,2]. This is the first time to our knowledge that Laplace pressure is calculated from the measured bridge curvatures along the process of evaporation and compared to experimental measurement data. A comparison with the experimental data from analogous capillary bridge extension tests is also shown and discussed. The behavior of evaporating liquid bridges is seen as strongly dependent on the grain separation. Initial negative Laplace pressure at small separations is seen to significantly augment during an advanced stage of evaporation, but to turn into positive pressure, after an instability toward the end of the process, and prior to rupture. At larger separations the pressure is positive all the time, changing a little, but rupturing early. Rupture in all cases occurs at positive pressure. However, because of the evolution of the surface area of contact, the resultant total capillary forces are always tensile, and decreasing toward zero in all cases. Comparison between measured total resultant capillary forces and those calculated from the Young-Laplace law is very good, except for some discrepancies at very small separations (below 50 μm). Up to four consecutive instabilities of capillary bridge are seen developing at some sphere separations. They are: re-pinning-induced suction (pressure) instability; Rayleigh nodoid/ catenoid/unduloid unstable transition, associated with zero-pressure; Rayleigh unduloid/cylinder unstable transition, associated with the formation of a liquid-wire; and lastly, a pinching instability of the liquid-wire, associated with the bridge rupture. Rupture of the bridges is seen at large separations to occur quite early, at only 1/4-1/3 of the initial water volume evaporated. At smallest separations, rupture occurs in a seemingly unstable way when water evaporates from the bridge thinnest section of the neck.

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Section: Introductionmentioning

confidence: 99%

Section: Experimental Inputmentioning

confidence: 99%

Section: Experimental Inputmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Laplace pressure evolution and four instabilities in evaporating two-grain liquid bridges

2015

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Extending Lifetime of Water Droplets Using Mirror‐Nanoporous Surfaces

Bellino

2020

Adv Materials Inter

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to integrate versatile platforms, the low reagent/sample consumption, and the high throughput that can be achieved via automation. [5] To perform assays on such small liquid volumes (i.e., microliter range), especially in many bioapplications that require operation at physiological temperature (37 °C), it is critical to reduce the evaporation rate of the droplets to expand their lifetime. Physiological temperature is indeed necessary in the operation of a wide range of biochemical assays, such as in most cell culture techniques [6] (from single [7] to 3D cell culture [8]) and several enzymebased analysis. [9] To date, methods to slow down droplet evaporation generally use high-humidity chambers or put the droplets under an oxygen-permeable biocompatible oil barrier.

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Towards the end of drying of granular materials: enhanced evaporation and drying-induced collapse

Wang

Maillet

Pereira

et al. 2021

Preprint

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We experimentally study the drying of loosely packed wet glass beads at low initial water content. The drying rate is found to decrease at the start, corresponding to the decreasing rate period controlled by vapor diffusion, followed by a deviation in drying rate from the diffusion limited evaporation. The propagation of drying front associated with a sharp saturation gradient is identified through both image analysis and magnetic resonance imaging technique. The drying-induced collapse of granular medium is observed and quantified. The concentrated collapse at the end of drying suggests the existence of liquid in the form of liquid bridges in the apparent dry region until the end of drying process. Collapse event is found to be local, i.e., a clear boundary can be identified for each collapse event, below which the loosely packed medium remains intact. This indicates the existence of a saturation gradient in the apparent dry region. The drying dynamics and collapse statistics suggest that the observed transition of drying regimes is due to Kelvin effect. This work demonstrates for the first time the drying enhancement phenomenon due to Kelvin effect even for grains with size of hundreds of micrometers, and provides insights on the drying process of partially saturated granular materials, especially near the final period of evaporation.

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Evaporation-induced evolution of the capillary force between two grains

Cited by 32 publications

References 59 publications

Laplace pressure evolution and four instabilities in evaporating two-grain liquid bridges

Laplace pressure evolution and four instabilities in evaporating two-grain liquid bridges

Extending Lifetime of Water Droplets Using Mirror‐Nanoporous Surfaces

Towards the end of drying of granular materials: enhanced evaporation and drying-induced collapse

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