Rise in optimized capillary channels

Figliuzzi, Bruno; Buie, Cullen

doi:10.1017/jfm.2013.373

Cited by 25 publications

(11 citation statements)

References 35 publications

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“…Conversely, a few uncommon situations that escape Washburn law were recently evidenced. (i) Staple (2001), Reyssat (2008) and Figliuzzi (2013) analytically and experimentally studied the progression of liquids in capillary tubes with non-uniform cross-sections [14][15][16]. They reported scaling laws of the type ‫ݖ‬ሺ‫ݐ‬ሻ ~ ‫ݐ‬ ఉ , where β was found to depend on the tube shape and to vary between 0 and ½.…”

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confidence: 99%

Capillary descent

et al. 2018

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A superhydrophobic capillary tube immersed in water and brought in contact with the bath surface will be invaded by air, owing to its aerophilicity. We discuss this phenomenon where the ingredients of classical capillary rise are inverted, which leads to noticeable dynamical features. (1) The main regime of air invasion is linear in time, due to the viscous resistance of water. (2) Menisci in tubes with millimetre-size radii strongly oscillate before reaching their equilibrium depth, a consequence of inertia. On the whole, capillary descent provides a broad variety of dynamics where capillary effects, viscous friction and liquid inertia all play a role.

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confidence: 99%

Capillary descent

et al. 2018

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“…The creeping movement occurs when the meniscus reaches the wide parts of the sinusoidal tube. Further burst-like jumping occurs when the wetting front gradually reaches a converging section of the tube, as substantiated by Figliuzzi and Buie (2013) who studied the rise in optimized capillary channels. The meniscus then propagates until it reaches a new converging section, and so on.…”

Section: 1029/2020wr027314mentioning

confidence: 77%

Effects of Time‐Dependent Contact Angle on Wettability of Subcritically Water‐Repellent Soils

Wang

Wallach

2020

Water Resources Research

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Recent studies have indicated that under certain conditions, most soils are water repellent to some degree, which impacts agricultural fields, pastures, forests, grasslands, and turf areas. Soil water repellency originates from amphiphilic molecules that reorient during contact with water. However, models to describe the flow in soils affected by time-dependent contact angle (CA(t)) are still lacking. The current study aims to close this gap. The measured CA(t) for an oleic acid-coated glass surface and a uniform capillary tube indicated that the initial CA was substantially higher for the latter. However, the rate of CA decrease was similar for both cases in spite of the fact that the contact area between the water and the tube wall continuously increases by the capillary rise. This indicates that the amphiphilic molecules reorientation at the vicinity of the contact line rather than at the wetted tube area controls the CA dynamics. A mathematical model for flow in a uniform and sinusoidal capillary tube with CA(t) < 90°that includes model for the reorientation of the amphiphilic molecules was introduced. The model for uniform case was successfully verified by comparison with measured capillary rise in a coated uniform tube. The simulations indicated that nonuniform pore geometry amplifies the effect of CA(t) on the capillary rise dynamics. The stepwise meniscus propagation in the sinusoidal capillary tubes is driven by the time for the meniscus to reach the converging section of the tube. The retardation in capillary rise increases with tube waviness.

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“…This can be particularly desirable, when the size of opening at the downstream must be restricted to certain values. An important aspect of a converging-diverging (CD) or diverging-converging (DC) cycles is that when the size of transition region is negligible and the total length of each microchannel is the same, the total time for filling the cycle is the same for both CD and DC arrangements 34 , 38 . Our simulations show, however, that this is not the case in the CNTs with nanojunctions.…”

Section: Resultsmentioning

confidence: 99%

Nanojunction Effects on Water Flow in Carbon Nanotubes

Ebrahimi

Ramazani

Sahimi

2018

Sci Rep

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We report on the results of extensive molecular dynamics simulation of water imbibition in carbon nanotubes (CNTs), connected together by converging or diverging nanojunctions in various configurations. The goal of the study is to understand the effect of the nanojunctions on the interface motion, as well as the differences between what we study and water imbibition in microchannels. While the dynamics of water uptake in the entrance CNT is the same as that of imbibition in straight CNTs, with the main source of energy dissipation being the friction at the entrance, water uptake in the exit CNT is more complex due to significant energy loss in the nanojunctions. We derive an approximate but accurate expression for the pressure drop in the nanojunction. A remarkable difference between dynamic wetting of nano- and microjunctions is that, whereas water absorption time in the latter depends only on the ratios of the radii and of the lengths of the channels, the same is not true about the former, which is shown to be strongly dependent upon the size of each segment of the nanojunction. Interface pinning-depinning also occurs at the convex edges.

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Rise in optimized capillary channels

Cited by 25 publications

References 35 publications

Capillary descent

Capillary descent

Effects of Time‐Dependent Contact Angle on Wettability of Subcritically Water‐Repellent Soils

Nanojunction Effects on Water Flow in Carbon Nanotubes

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