Surfactant Effects on the Dynamics of Capillary Rise and Finger Formation in Square Capillaries

Wijnhorst, Rozeline; Goede, T. C. de; Bonn, Daniel; Shahidzadeh, Noushine

doi:10.1021/acs.langmuir.0c01965

Cited by 12 publications

(20 citation statements)

References 58 publications

(100 reference statements)

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“…At the end of Stage III, gravitational forces become significant owing to the balance of gravity and capillarity. The meniscus stops at the equilibrium capillary rise height (h e ) expressed as follows [15,36]:…”

Section: Effect Of Surface Tension Of the Fluids On Capillary Rise Dynamicsmentioning

confidence: 99%

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

et al. 2021

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Capillary-driven action is an important phenomenon which aids the development of high-performance heat transfer devices, such as microscale heat pipes. This study examines the capillary rise dynamics of n-butanol/water mixture in a single vertical capillary tube with different radii (0.4, 0.6, and 0.85 mm). For liquids, distilled water, n-butanol, and their blends with varying concentrations of butanol (0.3, 0.5, and 0.7 wt.%) were used. The results show that the height and velocity of the capillary rise were dependent on the tube radius and liquid surface tension. The larger the radius and the higher the surface tension, the lower was the equilibrium height (he) and the velocity of rise. The process of capillary rise was segregated into three characteristic regions: purely inertial, inertial + viscous, and purely viscous regions. The early stages (purely inertial and inertial + viscous) represented the characteristic heights h1 and h2, which were dominant in the capillary rise process. There were linear correlations between the characteristic heights (h1, h2, and he), tube radius, and surface tension. Based on these correlations, a linear function was established between each of the three characteristic heights and the consolidated value of tube radius and surface tension (σL/2πr2).

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Section: Effect Of Surface Tension Of the Fluids On Capillary Rise Dynamicsmentioning

confidence: 99%

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

et al. 2021

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“…There is a reasonable agreement between our numerical results and the experimental measurement. The equilibrium bulk height are all smaller than [29]. Here the tip height h0 + h1 is shown and the agreement is not good.…”

Section: Comparison With Experimentsmentioning

confidence: 86%

“…The dynamics of capillary rising in a square tube has been studied both experimentally [24,28,29] and numerically [30,31]. Gurumurthy et al [30] used volume-of-fluid method with adaptive mesh refinement.…”

Section: Introductionmentioning

confidence: 99%

Capillary Rising in a Tube with Corners

2022

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We study the dynamics of a fluid rising in a capillary tube with corners. In the cornered tube, unlike the circular tube, fluid rises with two parts, the bulk part where the entire cross-section is occupied by the fluid, and the finger part where the cross-section is only partially filled. Using Onsager principle, we derive coupled time-evolution equations for the two parts. We show that (a) at the early stage of rising, the dynamics is dominated by the bulk part and the fluid height h 0 (t)shows the same behavior as that in the circular tube, and (b) at the late stage, the bulk part stops rising, but the finger part keeps rising following the scaling law of h 1 (t) ∼ t 1/3 . We also show that due to the coupling between the two parts, the equilibrium bulk height is smaller than the Jurin's height which ignores the effect of the finger part.

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“…These solute concentration gradients are expected to lead to surface-tension gradients, which in turn give rise to Marangoni stresses that act on the liquid to drive flow. Wijnhorst et al 63 used experiments to study the effect of surfactants on the dynamics of capillary rise and finger formation in closed rectangular channels and capillary tubes. The addition of surfactant results in reduced meniscus propagation due to the decrease in surface tension, and qualitative differences were observed in finger dynamics compared to pure liquids.…”

Section: Influence Of Evaporationmentioning

confidence: 99%

Capillary flow of liquids in open microchannels: overview and recent advances

Kolliopoulos

Kumar

2021

npj Microgravity

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Capillary flow is the spontaneous wicking of liquids in narrow spaces without the assistance of external forces. Examples of capillary flow can be found in numerous applications ranging from controlling and transporting fuel in spacecrafts to printed electronics manufacturing. Open rectangular microchannels often appear in these applications, with the lack of a top resulting in a complex free-surface morphology and evaporation. Here, we present a brief overview of this topic and discuss some recent advances.

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Surfactant Effects on the Dynamics of Capillary Rise and Finger Formation in Square Capillaries

Cited by 12 publications

References 58 publications

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

Capillary Rising in a Tube with Corners

Capillary flow of liquids in open microchannels: overview and recent advances

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