Results 261 to 270 of about 461,135 (297)
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Direct measurement of the apparent slip length
Physical Review E, 2005We measure velocity profiles in water flowing through thin microchannels, using particle image velocimetry combined with a nanopositioning system. From the velocity profiles, we determine the slip lengths in two cases: Smooth hydrophilic glass surfaces, and smooth hydrophobic glass surfaces, grafted with a monolayer of silane.
Pierre, Joseph, Patrick, Tabeling
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Slip length crossover on a graphene surface
The Journal of Chemical Physics, 2015Using equilibrium and non-equilibrium molecular dynamics simulations, we study the flow of argon fluid above the critical temperature in a planar nanochannel delimited by graphene walls. We observe that, as a function of pressure, the slip length first decreases due to the decreasing mean free path of gas molecules, reaches the minimum value when the ...
Zhi, Liang, Pawel, Keblinski
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Proceedings of the Human Factors Society Annual Meeting, 1991
Slipping and falling is a major economic problem. Past research has concentrated on the relationship between the shoe and the floor surface while more recent research has extended into the human factors of slipping. The measurement of slipperiness, as opposed to the coefficient of friction, depends on a thorough understanding of why slips start and ...
Tom B. Leamon, Kai Way Li
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Slipping and falling is a major economic problem. Past research has concentrated on the relationship between the shoe and the floor surface while more recent research has extended into the human factors of slipping. The measurement of slipperiness, as opposed to the coefficient of friction, depends on a thorough understanding of why slips start and ...
Tom B. Leamon, Kai Way Li
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EFFECTIVE SLIP LENGTH: SOME ANALYTICAL AND NUMERICAL RESULTS
The ANZIAM Journal, 2015More and more experimental evidence demonstrates that the slip boundary condition plays an important role in the study of nano- or micro-scale fluid. We propose a homogenization approach to study the effective slippage problem. We show that the effective slip length obtained by homogenization agrees with the results obtained by the traditional method ...
Zhang, Xingyou (Philip) +2 more
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Oscillatory Flow Through a Channel with Stick–Slip Walls: Complex Navier’s Slip Length
AIP Conference Proceedings, 2011Effective slip lengths for pressure-driven oscillatory flow through a parallel-plate channel with boundary slip are deduced using a semi-analytic method of eigenfunction expansions and point matching. The channel walls are each a superhydrophobic surface micropatterned with no-shear alternating with no-slip stripes, which are aligned either parallel or
Chiu-On Ng +3 more
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Large Slip Length over a Nanopatterned Surface
Chinese Physics Letters, 2007A thermodynamic method is employed to analyse the slip length of hydrophobic nanopatterned surface. The maximal slip lengths with respect to the hydrophobicity of the nanopatterned surface are computed. It is found that the slip length reaches more than 50 μm if the nanopatterned surfaces have a contact angle larger than 160°. Such results are expected
Li Ding +4 more
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Direct measurement of slip length in electrolyte solutions
"Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, 2010Electrokinetic effects and electrostatic repulsion between tracer particles and glass surface have both been proposed as possible sources that would lead to false slip results obtained from velocimetry-based measurements. Using a three-dimensional total internal reflection velocimetry technique, we address such a concern by comparing the measured slip ...
P. Huang, K.S. Brayer
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Slip Length Measurements Using µPIV and TIRF‐Based Velocimetry
Israel Journal of Chemistry, 2014AbstractThe goal of this paper is to review progress (mostly recent) made in micro and nanovelocimetry, focusing on two techniques: µPIV (microparticle image velocimetry) and nanoPTV (nanoparticle tracking velocimetry). The paper focuses on the measurement of slippage (taken as a benchmark for these techniques), concentrating on work done in our group.
Li, Zhenzhen +8 more
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Effective slip lengths for flows over surfaces with nanobubbles: the effects of finite slip
Journal of Physics: Condensed Matter, 2009We consider effective slip lengths for flows of simple liquids over surfaces contaminated by gaseous nanobubbles. In particular, we examine whether the effects of finite slip over the liquid-bubble interface are important in limiting effective slip lengths over such surfaces.
S C, Hendy, N J, Lund
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Frictional slip lengths and blockage coefficients
Physics of Fluids, 2011This paper shows that the frictional slip lengths for longitudinal Stokes shear flow over a superhydrophobic surface are precisely the blockage coefficients for uniform potential flow past screens with the same geometry. This observation facilitates useful knowledge transfer between two apparently disparate areas of fluid dynamics.
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