Capillary-pressure driven adhesion of rigid-planar surfaces

Ward, Thomas

doi:10.1016/j.jcis.2010.11.065

Cited by 18 publications

(25 citation statements)

References 23 publications

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“…The problem is entirely different if the flow is caused by the motion of substrates and the gap thickness changes in time. For example, the rate equation for the displacement of a liquid bridge under a defined pulling force is investigated in the study by Ward (2011). The measurements from Amar & Bonn (2005) were conducted at very low stretching speeds of 20–50 m s, high viscosities of 30 Pa s and large initial heights.…”

Section: Introductionmentioning

confidence: 99%

Fingering instability of a viscous liquid bridge stretched by an accelerating substrate

2020

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Section: Introductionmentioning

confidence: 99%

Fingering instability of a viscous liquid bridge stretched by an accelerating substrate

2020

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“…He did not predict the radial spreading time and velocities in his equations and experiments in the paper. A similar work was proposed by T. Ward for the analysis on the dewetting aspects of a liquid bridge formed by a gap between two surfaces [13]. The different aspect of the problem was in the load orientation, because the external load generated was opposite that of the liquid droplet.…”

Section: Introductionmentioning

confidence: 83%

“…Detailed derivations and explanations are found in Refs. [12,13], but a brief introduction of the theoretical background along with the resulting equations are presented in the subsequent section.…”

Section: Introductionmentioning

confidence: 99%

“…The flat surface side of the glass slide is much larger than the initial droplet radius ( ) , with R defined as the final droplet radius with no noticeable spreading or spontaneous fingering-like pattern formations[13] after a long period of elapsed time, at least 1ｘ10 3 s. For the similarity solution throughout this paper, variables without ( * ) denote quantities with units (Real scale), variables with ( * ) denote scaled quantities (No units), and constants are expressed in symbols without ( * ). All the definitions of variables and symbols not covered in the contexts are included in the nomenclature section at the end of this paper.…”

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confidence: 99%

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Squeezing of resin droplet with various viscosities between two parallel glasses with very narrow gap

Ha¹,

Han²

2015

J Mech Sci Technol

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In this study, the mechanical behavior of radial spreading in resin with various viscosities and squeezed between two parallel glass slides was studied. Radial spreading rate was derived in the conventional way by using lubrication analysis of the Newtonian fluid with negligible capillary and Reynolds number. Simplified momentum and continuity equations were solved using the boundary conditions of a force balance in the vertical direction and an interfacial stress balance at the resin edge between the fluid and air interface. Then, the final equations for spreading radius and speed were derived by modifying the results for the vertical movement and vertical speed of the upper moving plane. The proposed theoretical work is advantageous for improved comparison with experiments. The work was verified through droplet spreading tests utilizing a wide range of resin samples of different viscosities and surface tension, droplet volumes of the sample and different external loadings. Experimental results were consistent with the theoretical predictions for spreading radius and spreading radial speed. Then, the surface tension was measured and compared based on a theoretical model to test the data by modifying the estimated value.

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“…A detailed account of capillary adhesion is beyond the scope of this work, and requires careful and precise experimental protocols to control details such as contact line pinning, interfacial curvature, and parallelism errors (we refer the reader to recent work such as [26]). These effects are negligible when the magnetic field is activated and the yield stress increases by several orders of magnitude; however, to illustrate that the deviations from our model predictions at small R 0 with the field off can be plausibly attributed to Capillary effects, we report the measured initial static force, shown as the inset of Fig.…”

Section: B Field-responsive Magnetorheological Fluidmentioning

confidence: 99%

Controllable adhesion using field-activated fluids

et al. 2011

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We demonstrate that field-responsive magnetorheological (MR) fluids can be used for variablestrength controllable adhesion. The adhesive performance is measured experimentally in tensile tests (a.k.a. probe-tack experiments) in which the magnetic field is provided by a cylindrical permanent magnet. Increasing the magnetic field strength induces higher peak adhesive forces. We hypothesize that the adhesion mechanism arises from the shear resistance of a yield stress fluid in a thin gap. This hypothesis is supported by comparing the experimentally measured adhesive performance to the response predicted by a lubrication model for a non-Newtonian fluid with a field-dependent yield stress. The model predictions are in agreement with experimental data up to moderate field strengths. Above a critical magnetic field strength the model over-predicts the experimentally measured values indicating non-ideal conditions such as local fluid dewetting from the surface.

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Capillary-pressure driven adhesion of rigid-planar surfaces

Cited by 18 publications

References 23 publications

Fingering instability of a viscous liquid bridge stretched by an accelerating substrate

Fingering instability of a viscous liquid bridge stretched by an accelerating substrate

Squeezing of resin droplet with various viscosities between two parallel glasses with very narrow gap

Controllable adhesion using field-activated fluids

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