Evidence of shear-dependent boundary slip in newtonian liquids

Neto, Chiara; Craig, Vincent S. J.; Williams, Dean T.

doi:10.1140/epjed/e2003-01-018-0

Cited by 96 publications

(87 citation statements)

References 38 publications

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“…The conclusions have been confirmed by Molecular Dynamics simulations [135] and are consistent with studies of flow in capillaries with diameters of tens of nanometers [3,91]. In this context, the large number of recent published experiments reporting some form of (apparent) slip with λ ∼ 1 nm−1 µm in the flow of Newtonian liquids is surprising [9,16,17,18,29,30,32,33,38,39,40,67,87,88,68,108,116,125,126,150,162,163,178,192,193,194,195], and has allowed to re-discover a few early [29] Poly(carbonate)+PVP SDS solutions studies reporting some degree of slip [21,34,46,141,160]. In part, this chapter is an attempt to describe and interpret these more recent experimental results.…”

Section: Newtonian Liquids: No-slip? Slip?supporting

confidence: 75%

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Microfluidics: The No-Slip Boundary Condition

Lauga

Brenner

Stone

2007

Springer Handbook of Experimental Fluid Mechanics

591

674

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The no-slip boundary condition at a solid-liquid interface is at the center of our understanding of fluid mechanics. However, this condition is an assumption that cannot be derived from first principles and could, in theory, be violated. In this chapter, we present a review of recent experimental, numerical and theoretical investigations on the subject. The physical picture that emerges is that of a complex behavior at a liquid/solid interface, involving an interplay of many physico-chemical parameters, including wetting, shear rate, pressure, surface charge, surface roughness, impurities and dissolved gas.

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Section: Newtonian Liquids: No-slip? Slip?supporting

confidence: 75%

“…Other more complex behaviors remain to be understood, including dependence of the results on the molecular shape and size [30,55,68,195], probe size [108], or viscosity [40,116]. The development of alternative direct experimental methods would allow for a more precise quantification of slip phenomena.…”

Section: Perspectivementioning

confidence: 99%

Microfluidics: The No-Slip Boundary Condition

Lauga

Brenner

Stone

2007

Springer Handbook of Experimental Fluid Mechanics

591

674

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“…And, the higher is the rotating speed, the larger is the possibility of existence of wall slip. This conclusion is consistent with the previous achievements in references [19,23,25,29,36]. The modified model is more accurate in the prediction of friction coefficient for water lubricated PTFE bearing.…”

Section: Comparison Of Experimental and Theoretical Resultssupporting

confidence: 93%

“…This hypothesis is verified by experiments to a macro sense, and has been widely used in theoretical and experimental researches in fluid dynamic problems. However, in recent years, with the development of micro-nanometer science, technology and related fields as well as the help of some modern measurement technologies, such as the atomic force microscope (AFM), surface force apparatus (SFA), micro-particle image velocimeter (μ-PIV), near field laser velocimeter (NFLV) and the molecular dynamics simulation (MDS) etc., researchers find that no slip boundary condition is no longer applicable under certain conditions, namely: boundary slip may occur in many instances [16][17][18][19][20][21]. Therefore, boundary slip phenomenon affects the fluid dynamic behaviors.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental research on the friction coefficient of water lubricated bearing with consideration of wall slip effects

Xie

Rao

Liu

et al. 2015

Mechanics & Industry

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-Researches of the nature of friction coefficient of water lubricated bearing are carried out in this paper. Based on the experimental results of composite material bearing under hydrodynamic lubrication by water, we calculate the Stribeck curves as the function of load and speed, deviate the modified Reynolds equation considering wall slip effects in Cartesian coordinate system, put forward the essential model of friction coefficient, the composition of friction coefficient and essential changing correlation between them. Numerical results are in good agreement with experimental results, which verifies existence of wall slip. Researches indicate that there is always an appropriate working condition which friction coefficient is minimum. Comparison of the theoretical and experimental results shows that they are consistent on the overall trend but still exist some deviations under certain operating conditions. Reasonable explanations are given to illustrate the correctness of theoretical model. Key words:Water lubricated bearing / nature of friction coefficient / wall slip effect / solid contact effect and fluid viscous effect / experimental research

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“…͑ii͒ One can measure the force required for squeeze flows in long and narrow geometries such as are found in the surface force apparatus ͑SFA͒ or atomic force microscope ͑AFM͒. [8][9][10][11][12][13][14][15][16][17][18][19] Slip reduces the viscous resistance, and quasisteady probe motion is assumed. ͑iii͒ One can measure pressure-driven velocity profiles in a capillary or microchannel using small particles as passive tracers.…”

Section: Introductionmentioning

confidence: 99%

Brownian motion near a partial-slip boundary: A local probe of the no-slip condition

2005

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Motivated by experimental evidence of violations of the no-slip boundary condition for liquid flow in micrometer-scale geometries, we propose a simple, complementary experimental technique that has certain advantages over previous studies. Instead of relying on externally induced flow or probe motion, we suggest that colloidal diffusivity near solid surfaces contains signatures of the degree of fluid slip exhibited on those surfaces. To investigate, we calculate the image system for point forces ͑Stokeslets͒ oriented perpendicular and parallel to a surface with a finite slip length, analogous to Blake's solution for a Stokeslet near a no-slip wall. Notably, the image system for the point source and perpendicular Stokeslet contain the same singularities as Blake's solution; however, each is distributed along a line with a magnitude that decays exponentially over the slip length. The image system for the parallel Stokeslet involves a larger set of fundamental singularities, whose magnitude does not decay exponentially from the surface. Using these image systems, we determine the wall-induced correction to the diffusivity of a small spherical particle located "far" from the wall. We also calculate the coupled diffusivities between multiple particles near a partially slipping wall. Because, in general, the diffusivity depends on "local" wall conditions, patterned surfaces would allow differential measurements to be obtained within a single experimental cell, eliminating potential cell-to-cell variability encountered in previous experiments. In addition to motivating the proposed experiments, our solutions for point forces and sources near a partial-slip wall will be useful for boundary integral calculations in slip systems.

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Evidence of shear-dependent boundary slip in newtonian liquids

Cited by 96 publications

References 38 publications

Microfluidics: The No-Slip Boundary Condition

Microfluidics: The No-Slip Boundary Condition

Theoretical and experimental research on the friction coefficient of water lubricated bearing with consideration of wall slip effects

Brownian motion near a partial-slip boundary: A local probe of the no-slip condition

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