Mass transfer in a symmetric sinusoidal wavy-walled channel for oscillatory flow

Nishimura, Tatsuo; Murakami, Shinichiro; Kawamura, Yoshiharu

doi:10.1016/0009-2509(93)80349-u

Cited by 27 publications

(11 citation statements)

References 22 publications

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“…For transport to the surface of confocal ellipses, a 100% increase over conduction is observed by Saatdjian et al (1996). For mass transfer to the surfaces of a sinusoidal wavy-walled channel, chaos leads to higher rates of transfer, and the effects are associated with the flow separation and oscillation induced by the wall geometry (Nishimura 1995, Nishimura and Kojima 1995, Nishimura et al 1993. Finally, Shrivastava et al (2008) were able to predict to within 4-12% the enhancements seen in experiments with ultrafiltration membrane spacers using a simple model, even though this model assumes instantaneous mixing of the fluid.…”

Section: Introductionmentioning

confidence: 99%

Interfacial mass transport in steady three-dimensional flows in microchannels

Kirtland¹,

Siegel²,

Stroock³

2009

New J. Phys.

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Section: Introductionmentioning

confidence: 99%

Interfacial mass transport in steady three-dimensional flows in microchannels

Kirtland¹,

Siegel²,

Stroock³

2009

New J. Phys.

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“…It is well-known that the interaction of an oscillating fluid with solid boundaries can create a time-averaged secondary flow known as steady streaming, [32][33][34][35][36][37][38] and this flow usually involves fluid recirculation that is governed by the geometry and oscillation conditions. Steady streaming has found limited application for microscale mixing, [39][40][41][42][43][44][45][46][47] and it has recently been exploited for controlled cell lysis 48 and transporting cells within a device. 49 Here, we show that steady streaming eddies created by audible-frequency oscillations have the remarkable ability to capture single cells and suspend them at predictable locations in 3-D. For the geometry of Figure 1, the oscillation creates four symmetric eddies that circulate within the midplane of the channel (Figure 1).…”

mentioning

confidence: 99%

Hydrodynamic Tweezers: 1. Noncontact Trapping of Single Cells Using Steady Streaming Microeddies

2006

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A key need for dynamic single-cell measurements is the ability to gently position cells for repeated measurements without perturbing their behavior. We describe a new method that uses a gentle secondary flow to trap and suspend single cells, including motile cells, at predictable locations in 3-D. Trapped cells can be more dense or less dense than the surrounding medium. The cells are suspended without surface contact in one of four steady streaming eddies created by audible-frequency fluid oscillation (< or =1000 Hz) in a microchannel containing a single fixed cylinder (radius = 125 microm). Comparison of measured trap locations to computations of the eddy flow show that each trap is located near the eddy center, and the location is controlled via the oscillation frequency. We use the motile phytoplankton cell (Prorocentrum micans) to experimentally measure the trapping force, which is controlled via the oscillation amplitude. Trapping forces up to 30 pN are generated while exerting moderate shear stresses (shear stresses < or = 1.5 N/m2) on the trapped cell. The magnitude of this trapping force is comparable to that of optical tweezers or dielectrophoretic traps, without requiring an external field outside the physiological range for cells (the shear stresses are comparable to those found in arterial blood flow). The unique combination of predictable 3-D positioning, insensitivity to cell and medium properties, strong adjustable trapping forces, and a gentle fluid environment makes hydrodynamic tweezers a promising new option for noncontact trapping of single cells in suspension.

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“…Nishimura et al. [9] studied oscillatory fluid flow in a symmetric sinusoidal wavy walled channel by using an electrochemical technique and observed unsteady vortices in each section of the channel (the flow patterns were visualized by the aluminum dust method). The vortical flow is the result of nonlinear interaction between curved walls and oscillatory flow and appears and disappears within the oscillation cycle.…”

Section: Methods Detailedmentioning

confidence: 99%

Measure method of effective diffusion in gas oscillating in channels of variable radius or porous medium

2021

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The paper discusses a new technique for measuring the diffusion coefficient of vapor of a volatile fluid in air in long straight channels or porous media. The proposed experimental technique is universal and allows a) determining the coefficient of molecular diffusion of vapor of a volatile liquid in air; b) calculating the coefficient of effective diffusion of vapor in oscillating air. The proposed technique was tested in the study of the diffusion of 2-propanol vapor in air at rest and oscillating air in a channel of variable radius and a porous medium consisting of randomly packed hard spheres of equal diameter and was found to be relevant. Initial experiments with a porous medium show that the proposed experimental technique can also be used to estimate the diffusive tortuosity of porous media. The results of studies, finished and planned, are useful for understanding the physical processes taking place in various technical operations including wood and food drying, drug delivery, etc. The new experimental technique provides accurate measurement of the molecular diffusion coefficient of vapor of a volatile fluid in air. The experimental setup allows measuring the enhanced mass transfer of vapor of a volatile fluid in oscillating air in a straight channel of constant/variable radius and a porous medium. The additional advantage of the present technique is that it enables the estimation of the diffusive tortuosity of a porous medium.

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Mass transfer in a symmetric sinusoidal wavy-walled channel for oscillatory flow

Cited by 27 publications

References 22 publications

Interfacial mass transport in steady three-dimensional flows in microchannels

Interfacial mass transport in steady three-dimensional flows in microchannels

Hydrodynamic Tweezers: 1. Noncontact Trapping of Single Cells Using Steady Streaming Microeddies

Measure method of effective diffusion in gas oscillating in channels of variable radius or porous medium

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