Buchbesprechung: Wie die Naturgesetze Wirklichkeit schaffen by H. Genz

Schlichting, Hans Joachim

doi:10.1002/1521-3943(200209)33:5<241::aid-piuz241>3.0.co;2-x

Cited by 3 publications

(4 citation statements)

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“…The glycerol-in-water and the water system are actuated with the same boundary velocity given in eqn (18) , but the difference in viscosity of the two liquids leads to different acoustic responses. The amplitude of the induced first-order resonance pressure is reduced by a factor of 2.6 from 0.243 MPa in the lowviscosity water of Fig.…”

Section: F Streaming In a High-viscosity Buffermentioning

confidence: 99%

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A numerical study of microparticle acoustophoresis driven by acoustic radiation forces and streaming-induced drag forces

Müller

Barnkob

Jensen³

et al. 2012

Lab Chip

511

509

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Section: F Streaming In a High-viscosity Buffermentioning

confidence: 99%

“…h . l. The classical Rayleigh-Schlichting boundary-layer theory for acoustic streaming, [17][18][19][20] see Fig. 1, is valid in the limit of thin boundary layers in medium-sized channels, d % h % l, and a later extension 13 is valid in the limit of thin boundary layers in shallow channels, d .…”

Section: Introductionmentioning

confidence: 99%

A numerical study of microparticle acoustophoresis driven by acoustic radiation forces and streaming-induced drag forces

Müller

Barnkob

Jensen³

et al. 2012

Lab Chip

511

509

View full text Add to dashboard Cite

“…In the case of a standing wave which is parallel to the surface, the viscous dissipation results in a steady momentum flux typically oriented from the pressure antinodes to the pressure nodes close to the solid boundary. Due to the spatially fixed pressure nodes and antinodes, this results in a steady boundary layer vorticity termed inner boundary layer streaming or 'Schlichting streaming', 14 named after Hermann Schlichting who first modelled it mathematically. Once established, the powerful inner boundary layer streaming flow then generates counter rotating streaming vortices within the bulk of the fluid accordingly named outer boundary layer streaming or 'Rayleigh streaming', 2 named after Rayleigh who first modelled them mathematically.…”

Section: A Inner and Outer Boundary Layer Acoustic Streamingmentioning

confidence: 99%

Acoustofluidics 14: Applications of acoustic streaming in microfluidic devices

2012

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In part 14 of the tutorial series "Acoustofluidics--exploiting ultrasonic standing wave forces and acoustic streaming in microfluidic systems for cell and particle manipulation", we provide a qualitative description of acoustic streaming and review its applications in lab-on-a-chip devices. The paper covers boundary layer driven streaming, including Schlichting and Rayleigh streaming, Eckart streaming in the bulk fluid, cavitation microstreaming and surface-acoustic-wave-driven streaming.

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“…The theory of acoustic streaming, driven by the timeaveraged shear stress near rigid walls in the acoustic boundary layers of a standing wave, was originally described by Lord Rayleigh [9]. It has later been extended, among others, by Schlicting [10], Nyborg [11], Hamilton [12,13], and Muller et al [14]. Recently, Rednikov and Sadhal [15] have included the temperature dependence of the dynamic viscosity and shown that this can lead to a significant increase of the magnitude of the streaming ve-locity.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of thermoviscous effects in ultrasound-induced acoustic streaming in microchannels

2014

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We present a numerical study of thermoviscous effects on the acoustic streaming flow generated by an ultrasound standing-wave resonance in a long straight microfluidic channel containing a Newtonian fluid. These effects enter primarily through the temperature and density dependence of the fluid viscosity. The resulting magnitude of the streaming flow is calculated and characterized numerically, and we find that even for thin acoustic boundary layers, the channel height affects the magnitude of the streaming flow. For the special case of a sufficiently large channel height, we have successfully validated our numerics with analytical results from 2011 by Rednikov and Sadhal for a single planar wall. We analyzed the time-averaged energy transport in the system and the time-averaged second-order temperature perturbation of the fluid. Finally, we have made three main changes in our previously published numerical scheme to improve the numerical performance: (i) The time-averaged products of first-order variables in the time-averaged second-order equations have been recast as flux densities instead of as body forces. (ii) The order of the finite-element basis functions has been increased in an optimal manner. (iii) Based on the International Association for the Properties of Water and Steam (IAPWS 1995(IAPWS , 2008, and 2011), we provide accurate polynomial fits in temperature for all relevant thermodynamic and transport parameters of water in the temperature range from 10 to 50

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Buchbesprechung: Wie die Naturgesetze Wirklichkeit schaffen by H. Genz

Cited by 3 publications

References 0 publications

A numerical study of microparticle acoustophoresis driven by acoustic radiation forces and streaming-induced drag forces

A numerical study of microparticle acoustophoresis driven by acoustic radiation forces and streaming-induced drag forces

Acoustofluidics 14: Applications of acoustic streaming in microfluidic devices

Numerical study of thermoviscous effects in ultrasound-induced acoustic streaming in microchannels

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