An experimental investigation of high Reynolds number steady streaming generated by oscillating cylinders

Bertelsen, Arnold F.

doi:10.1017/s0022112074002564

Cited by 36 publications

(21 citation statements)

References 7 publications

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“…2A and B1 is qualitatively similar to the flow as described theoretically by Riley (16) and Stuart (17) and confirmed experimentally by Bertelsen (18). The flow pattern with confinement, as shown in Fig.…”

Section: Discussionsupporting

confidence: 87%

Influence of the Oscillation Direction of an Ultrasonic File on the Cleaning Efficacy of Passive Ultrasonic Irrigation

Jiang

Verhaagen

Versluis

et al. 2010

Journal of Endodontics

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Section: Discussionsupporting

confidence: 87%

Influence of the Oscillation Direction of an Ultrasonic File on the Cleaning Efficacy of Passive Ultrasonic Irrigation

Jiang

Verhaagen

Versluis

et al. 2010

Journal of Endodontics

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“…15,17,20 In order to accurately model the flow due to the combination of streaming and Poiseuille flows, it is useful to define two kinds of Reynolds numbers (i) Re s u s a/ , corresponding to the fast streaming flow near the bubble, and (ii) Re p u p H= , corresponding to the flow gradients over the channel width. It has been shown 43,44 that the streaming flow due to an oscillating cylinder for Re s Շ O(100) differs only slightly from the leading order theory (Re s ! 0).…”

Section: Modeling Of Trajectories Using Asymptotic Theorymentioning

confidence: 99%

Particle migration and sorting in microbubble streaming flows

Thameem

Hilgenfeldt

2016

Biomicrofluidics

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Ultrasonic driving of semicylindrical microbubbles generates strong streaming flows that are robust over a wide range of driving frequencies. We show that in microchannels, these streaming flow patterns can be combined with Poiseuille flows to achieve two distinctive, highly tunable methods for size-sensitive sorting and trapping of particles much smaller than the bubble itself. This method allows higher throughput than typical passive sorting techniques, since it does not require the inclusion of device features on the order of the particle size. We propose a simple mechanism, based on channel and flow geometry, which reliably describes and predicts the sorting behavior observed in experiment. It is also shown that an asymptotic theory that incorporates the device geometry and superimposed channel flow accurately models key flow features such as peak speeds and particle trajectories, provided it is appropriately modified to account for 3D effects caused by the axial confinement of the bubble. V C 2016 AIP Publishing LLC.

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“…Steady streaming.--A steady circulatory flow is observed in a fluid near vibrating bodies (33,34). This steady motion is generated by the Reynolds stresses associated with the oscillatory part of the flow within the boundary layer (35).…”

Section: Smentioning

confidence: 99%

Vibrating Zinc Electrodes in Ni/Zn Batteries

Liu

Cook

Yao

et al. 1982

J. Electrochem. Soc.

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In electrochemical processes where diffusion is rate controlling, the use of vibrating electrodes may result in an increase in the average mass transfer rate. The mechanism for the increase is that vibration changes the pattern of free convective flow developed during the process into a different flow pattern. Four models for the mass transfer enhancement are reviewed and modified. Vibrating zinc electrodes in Ni/Zn batteries (Vibrocel TM) are analyzed. The analyses include fluid dynamics, mass transfer, and electrochemical deposition phenomena. Three types of fluid flows are considered. The first, free-convective flow, is induced by the difference in density of the electrolyte near the electrode and in the bulk. The other two types, induced by the vibration of the zinc electrodes, are a periodic flow consisting of an oscillatory bulk flow and an oscillatory boundary flow, and a steady streaming near the upper and lower edges of the electrodes. The mass-transfer coefficients of zincate and hydroxide ions. are calculated. The morphology of electrochemical deposition of zinc from alkaline zincate solution is related to ion-surface interactions. The observed morphologies of zinc deposition in a cell with vibrating electrodes are explained. The limiting current density at the vibrating zinc electrode is calculated. Ni/Zn Cells with Vibrating ElectrodesTypically, Ni/Zn batteries have problems of poor cycle life caused by zinc electrode-related failures. Two major causes of failure are zinc dendrite growth and electrode shape change. During battery charging cycles, zinc dendrites form, grow, and eventually penetrate through the separator, thereby causing the formation of short circuits to the nickel hydroxide electrode. Shape change refers to the redistribution of active zinc material over the surface of the zinc electrode as a result of cell cycling. It has been experimentally demonstrated that shape change is caused by a combination of nonuniform current distribution (1) and convective flow driven by osmotic pumping of membrane separators (2). As a result of shape change, certain parts of the electrode receive a dense zinc deposit while other parts have no deposit. This reduces the effective surface area and capacity of the cell. Research efforts to minimize these two effects include the development of (i) low-resistance, high strength separators, (it) stable inorganic or organic additives to improve zinc deposition, and (iii) batteries with vibrating zinc electrodes.The vibrating electrode concept is based on a discovery made by yon Krusenstierna (3,4). He observed that if the zinc electrode was vibrated during charging in a small cell with an excess KOH electrolyte containing zincate, the problems of dendrite formation and shape change were effectively suppressed. Exide Management and Technology Company has implemented the concept of the vibrating zinc electrode in their Ni/Zn Vibrocel TM (5). Table I gives the design specification of a Vibrocel TM. The substrate of the Vibrocel TM zinc electrode is 32% perforated,...

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An experimental investigation of high Reynolds number steady streaming generated by oscillating cylinders

Cited by 36 publications

References 7 publications

Influence of the Oscillation Direction of an Ultrasonic File on the Cleaning Efficacy of Passive Ultrasonic Irrigation

Influence of the Oscillation Direction of an Ultrasonic File on the Cleaning Efficacy of Passive Ultrasonic Irrigation

Particle migration and sorting in microbubble streaming flows

Vibrating Zinc Electrodes in Ni/Zn Batteries

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