Micrometric Granular Ripple Patterns in a Capillary Tube

Zoueshtiagh, Farzam; Thomas, Peter J.; Thomy, V.; Merlen, Alain

doi:10.1103/physrevlett.100.054501

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…While further analysis of these phenomena extends beyond the scope of this paper, pattern formation, migration and mixing in microfluidic multi-phase flows have been investigated extensively in wide range of biomedical and chemical engineering applications (Gunther and Jensen, 2006). Recently,Zoueshtiagh et al (2008) has reported experimental study of micro granular ripple pattern formation in oscillating two-phase flow.…”

Section: Resultsmentioning

confidence: 99%

μ-PIV measurements of the ensemble flow fields surrounding a migrating semi-infinite bubble

2009

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Microscale particle image velocimetry (μ-PIV) measurements of ensemble flow fields surrounding a steadily-migrating semi-infinite bubble through the novel adaptation of a computer controlled linear motor flow control system. The system was programmed to generate a square wave velocity input in order to produce accurate constant bubble propagation repeatedly and effectively through a fused glass capillary tube. We present a novel technique for re-positioning of the coordinate axis to the bubble tip frame of reference in each instantaneous field through the analysis of the sudden change of standard deviation of centerline velocity profiles across the bubble interface. Ensemble averages were then computed in this bubble tip frame of reference. Combined fluid systems of water/air, glycerol/air, and glycerol/Si-oil were used to investigate flows comparable to computational simulations described in Smith and Gaver (2008) and to past experimental observations of interfacial shape. Fluorescent particle images were also analyzed to measure the residual film thickness trailing behind the bubble. The flow fields and film thickness agree very well with the computational simulations as well as existing experimental and analytical results. Particle accumulation and migration associated with the flow patterns near the bubble tip after long experimental durations are discussed as potential sources of error in the experimental method.

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Section: Resultsmentioning

confidence: 99%

μ-PIV measurements of the ensemble flow fields surrounding a migrating semi-infinite bubble

2009

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“…Note that viscous flow is also relevant to some engineering applications (Schaflinger, Acrivos & Stibi 1995;Wallner & Schaflinger 1998;Charru & Mouilleron-Arnould 2002). In particular, observations of ripple formation under oscillatory flow in a capillary tube have been reported by Zoueshtiagh et al (2008), in connection with microfluidic issues. In the experiments to be presented, it appeared first that the direction of the observed drift of fluid particles was opposite to the one expected.…”

Section: Introductionmentioning

confidence: 90%

Lagrangian drift near a wavy boundary in a viscous oscillating flow

Larrieu

Hinch²,

Charru

2009

J. Fluid Mech.

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The formation of sand ripples in oscillating flows is thought to be due to a steady streaming current which near the bottom is towards the crests. We present quantitative observations of this mean flow over self-formed and artificial ripples, by observing the displacement of a coloured filament after a number of oscillations in the simple situation of viscous Couette flow. Confusingly, the filament moves in the ‘wrong’ direction, because it follows the Lagrangian mean flow. We calculate the Lagrangian mean flow. A complication is that the amplitudes of the oscillations in the experiments are not small. We compare the predictions with the experimental observations of displacements of the filament, showing good agreement.

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“…In comparison, however, the low-frequency regime is much less explored. Particle collection in the form of ripples in closed systems through pulsating fields has been demonstrated [35][36][37], while in open systems particle movement is triggered by the formation of capillary waves at the liquid-air interface, causing floating particles to accumulate at the nodes and antinodes of the capillary wave, depending on their hydrophobicity [38], and sedimented particles to be collected due to inertial effects at locations dictated by the gradient of the flow field in rectangular chambers [39,40] and in droplets [41].…”

Section: Introductionmentioning

confidence: 99%

Microparticle Response to Two-Dimensional Streaming Flows in Rectangular Chambers Undergoing Low-Frequency Horizontal Vibrations

Agrawal¹,

Gandhi²,

Neild³

2014

Phys. Rev. Applied

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Manipulation of submicron-sized particles using second-order acoustic radiation forces at ultrasonic frequencies is hindered by the time-independent streaming flows. A similar phenomenon occurs when open fluid volumes are vibrated at low frequencies in the range of 100 Hz. The streaming phenomenon, in this lower-frequency range, is studied here by using horizontally actuated liquid-filled rectangular chambers. The formation of capillary waves at the liquid-air interface generates spatially varying flow fields in the bulk fluid, which can be used to collect particles at stable locations. However, the same spatial variation is the source of the streaming fields, which, under some conditions, can drag particles away from these stable locations. The governing equations for the second-order flow are derived and simulated, after which a particle-tracing algorithm is executed in the obtained flow field. Critical particle parameters are determined in multiple simulated chambers of different dimensions, with the aim of reducing the effect of the streaming field on the particle's movement. The simulation results are then applied experimentally to demonstrate the ability of this system to collect particles as small as 50 nm in diameter.

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Micrometric Granular Ripple Patterns in a Capillary Tube

Cited by 12 publications

References 17 publications

μ-PIV measurements of the ensemble flow fields surrounding a migrating semi-infinite bubble

μ-PIV measurements of the ensemble flow fields surrounding a migrating semi-infinite bubble

Lagrangian drift near a wavy boundary in a viscous oscillating flow

Microparticle Response to Two-Dimensional Streaming Flows in Rectangular Chambers Undergoing Low-Frequency Horizontal Vibrations

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