Microtransport induced by ultrasonic Lamb waves

Moroney, R.M.; White, Richard M.; Howe, Roger T.

doi:10.1063/1.105339

Cited by 149 publications

(63 citation statements)

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“…INTRODUCTION Acoustic streaming is steady fluid motion driven by the absorption of acoustic energy due to the interaction of acoustic waves with the fluid medium or its solid boundaries. Understanding the driving mechanisms of acoustic streaming patterns within acoustofluidic devices is important in order to precisely control it for the enhancement or suppression of acoustic streaming for applications such as particle/cell manipulation [1-8], heat transfer enhancement [9-12], noncontact surface cleaning [13][14][15][16][17], microfluidic mixing [18][19][20][21][22][23][24][25][26][27], and transport enhancement [28][29][30][31][32][33][34][35].In most bulk micro-acoustofluidic particle and cell manipulation systems of interest, the acoustic streaming fields are dominated by boundary-driven streaming [36], which is associated with acoustic dissipation in the viscous boundary layer [37]. Theoretical work on boundary-driven streaming was initiated by Rayleigh [38], and developed by a series of modifications for particular cases [39][40][41][42][43][44], which have paved the fundamental understanding of acoustic streaming flows.…”

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confidence: 99%

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

2017

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While classical Rayleigh streaming, whose circulations are perpendicular to the transducer radiating surfaces, is wellknown, transducer-plane streaming patterns, in which vortices circulate parallel to the surface driving the streaming, have been less widely discussed. Previously, a four-quadrant transducer-plane streaming pattern has been seen experimentally and subsequently investigated through numerical modelling. In this paper, we show that by considering higher order threedimensional cavity modes of rectangular channels in thin-layered acoustofluidic manipulation devices, a wider family of transducer-plane streaming patterns are found. As an example, we present a transducer-plane streaming pattern, which consists of eight streaming vortices with each occupying one octant of the plane parallel to the transducer radiating surfaces, which we call here eight-octant transducer-plane streaming. An idealised modal model is also presented to highlight and explore the conditions required to produce rotational patterns. It is found that both standing and travelling wave components are typically necessary for the formation of transducer-plane streaming patterns. In addition, other streaming patterns related to acoustic vortices and systems in which travelling waves dominate are explored with implications for potential applications. DOI:I. INTRODUCTION Acoustic streaming is steady fluid motion driven by the absorption of acoustic energy due to the interaction of acoustic waves with the fluid medium or its solid boundaries. Understanding the driving mechanisms of acoustic streaming patterns within acoustofluidic devices is important in order to precisely control it for the enhancement or suppression of acoustic streaming for applications such as particle/cell manipulation [1-8], heat transfer enhancement [9-12], noncontact surface cleaning [13][14][15][16][17], microfluidic mixing [18][19][20][21][22][23][24][25][26][27], and transport enhancement [28][29][30][31][32][33][34][35].In most bulk micro-acoustofluidic particle and cell manipulation systems of interest, the acoustic streaming fields are dominated by boundary-driven streaming [36], which is associated with acoustic dissipation in the viscous boundary layer [37]. Theoretical work on boundary-driven streaming was initiated by Rayleigh [38], and developed by a series of modifications for particular cases [39][40][41][42][43][44], which have paved the fundamental understanding of acoustic streaming flows.While Rayleigh streaming patterns (which have streaming vortices with components perpendicular to the driving boundaries) have been extensively studied [45][46][47][48], we have recently explored the mechanisms behind fourquadrant transducer-plane streaming [49] which generates streaming vortices in planes parallel to the driving boundary, and modal Rayleigh-like streaming [50] in which vortices have a roll size greater than the quarter wavelength of the main acoustic resonance and are driven by limiting velocities (the value of the streaming velocity just outside...

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confidence: 99%

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

2017

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“…This makes the FPW platform attractive for both sensing and pumping in liquid analyte applications. Liquid operation 31,32 has been demonstrated with piezoelectrically driven FPW devices. However, liquid operation with the present mag-FPW devices was very disappointing.…”

Section: Liquid Operationmentioning

confidence: 99%

“…This versatile structure has the potential to fulfill a variety of sensing and actuating functions in such a system. Furthermore, the FPW platform has been shown by others 31,32 to work with either gas or liquid ambient. The lower frequency operation compared to a SAW device simplifies the drive electronics.…”

Section: Summary and Future Directionsmentioning

confidence: 99%

Development of Magnetically Excited Flexural Plate Wave Devices for Implementation as Physical, Chemical, and Acoustic Sensors, and as Integrated Micro-Pumps for Sensored Systems

Schubert¹,

Mitchell²,

Graf³

et al. 2002

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The magnetically excited flexural plate wave (mag-FPW) device has great promise as a versatile sensor platform. FPW's can have better sensitivity at lower operating frequencies than surface acoustic wave (SAW) devices. Lower operating frequency (< 1 MHz for the FPW versus several hundred MHz to a few GHz for the SAW device) simplifies the control electronics and makes integration of sensor with electronics easier. Magnetic rather than piezoelectric excitation of the FPW greatly simplifies the device structure and processing by eliminating the need for piezoelectric thin films, also simplifying integration issues. The versatile mag-FPW resonator structure can potentially be configured to fulfill a number of critical functions in an autonomous sensored system. As a physical sensor, the device can be extremely sensitive to temperature, fluid flow, strain, acceleration and vibration. By coating the membrane with self-assembled monolayers (SAMs), or polymer films with selective absorption properties (originally developed for SAW sensors), the mass sensitivity of the FPW allows it to be used as biological or chemical sensors. Yet another critical need in autonomous sensor systems is the ability to pump fluid. FPW structures can be configured as micro-pumps. This report describes work done to develop mag-FPW devices as physical, chemical, and acoustic sensors, and as micro-pumps for both liquid and gas-phase analytes to enable new integrated sensing platform.4

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“…For example, illumination can induce a motion of liquids as the free energy of the illuminated surface changes locally [17]. Other smart pumping mechanisms include peristaltic pumps based on thin membranes [18], or polymer films [19] with a controlled deformation creating a guided flow along microchannels [20]. More than 10.000 papers have been published over the last 10 years on the topic of microfluidics but no gold standard for actuation is presented so far.…”

Section: General Considerationsmentioning

confidence: 99%

Surface Acoustic Wave Actuated Lab-on-Chip System for Single Cell Analysis

Thalhammer

Wixforth²

2013

J Biosens Bioelectron

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Collection, selection, amplification and detection of minimal amounts of biological samples became part of everyday life in medical and biological laboratories. The goal of the lab-on-a-chip technology is to automate standard laboratory processes and to analyze smallest samples reproducibly and reliably in a miniaturized format. Until now, however, microfluidic devices are not yet standardized equipment found in biologists' toolboxes. Just one of the obstacles is the difficulty of producing them. We review various approaches for lab-on-chip systems reported in the literature but focus on our own system, based on surface acoustic wave (SAW) actuation. Finally, we present a freely programmable planar chip system actuated by this operating principle and show that it has several advantages over 'conventional' microfluidic channel systems. Apart from avoiding the notorious problems of clogging, large pressure drops, and large surface area, our approach minimizes the risk of contamination and loss of analyte. Entering pointof-care diagnosis, the necessity of single cell analysis is dramatically increasing. To optimize a tumor therapy, for example, knowledge of the genetic composition of the heterogenic tumor tissue is essential. Hence, there exists the need for a reliable analysis system, which can be easily adapted to altering problems without reduction in reliability and reproducibility.

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Microtransport induced by ultrasonic Lamb waves

Cited by 149 publications

References 6 publications

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

Development of Magnetically Excited Flexural Plate Wave Devices for Implementation as Physical, Chemical, and Acoustic Sensors, and as Integrated Micro-Pumps for Sensored Systems

Surface Acoustic Wave Actuated Lab-on-Chip System for Single Cell Analysis

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