Spiraling Bubbles: How Acoustic and Hydrodynamic Forces Compete

Rensen, Judith; Bosman, Dennis; Magnaudet, Jacques; Ohl, Claus‐Dieter; Prosperetti, Andréa; Tögel, Rüdiger; Versluis, Michel; Lohse, Detlef

doi:10.1103/physrevlett.86.4819

Cited by 33 publications

(27 citation statements)

References 10 publications

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“…(78) on solid particles, this scaling is weaker and suggests a possible means for particle-bubble separation in a manner similar to particle-particle separation reported by Rogers et al (2010). Rensen et al (2001) presented an example of how one may control the motion of bubbles in a small fluidic system, where bubbles in a fluid channel are caused to move along a controlled spiral path by the influence of the acoustic radiation passing through the fluid transverse to the fluid's flow in the channel. Tandiono et al (2010) described ultrasonic entrainment of air into closed, filled microfluidic channels through capillary wave generation and air induction through a secondary port, a process unrelated to cavitation which is curiously mentioned in their title.…”

Section: Particles Colloidal Suspensions and Bubblesmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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This article reviews acoustic microfluidics: the use of acoustic fields, principally ultrasonics, for application in microfluidics. Although acoustics is a classical field, its promising, and indeed perplexing, capabilities in powerfully manipulating both fluids and particles within those fluids on the microscale to nanoscale has revived interest in it. The bewildering state of the literature and ample jargon from decades of research is reorganized and presented in the context of models derived from first principles. This hopefully will make the area accessible for researchers with experience in materials science, fluid mechanics, or dynamics. The abundance of interesting phenomena arising from nonlinear interactions in ultrasound that easily appear at these small scales is considered, especially in surface acoustic wave devices that are simple to fabricate with planar lithography techniques common in microfluidics, along with the many applications in microfluidics and nanofluidics that appear through the literature.

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Section: Particles Colloidal Suspensions and Bubblesmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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“…Our model determines the body velocity v(t) for a class of simple periodic swimming motions. We use a local approximation for the fluid force on each leg and the body, similar to those used in ordinary differential equation models of rising bubbles and falling paper (Rensen et al 2001;Andersen et al 2005). The force on each leg and on the body is proportional to their velocities relative to the fluid, raised to the power 1 or 2.…”

Section: Drag Coefficient Modelmentioning

confidence: 99%

Coordination of multiple appendages in drag-based swimming

Alben

Spears

Garth

et al. 2010

J. R. Soc. Interface.

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Krill are aquatic crustaceans that engage in long distance migrations, either vertically in the water column or horizontally for 10 km (over 200 000 body lengths) per day. Hence efficient locomotory performance is crucial for their survival. We study the swimming kinematics of krill using a combination of experiment and analysis. We quantify the propulsor kinematics for tethered and freely swimming krill in experiments, and find kinematics that are very nearly metachronal. We then formulate a drag coefficient model which compares metachronal, synchronous and intermediate motions for a freely swimming body with two legs. With fixed leg velocity amplitude, metachronal kinematics give the highest average body speed for both linear and quadratic drag laws. The same result holds for five legs with the quadratic drag law. When metachronal kinematics is perturbed towards synchronous kinematics, an analysis shows that the velocity increase on the power stroke is outweighed by the velocity decrease on the recovery stroke. With fixed time-averaged work done by the legs, metachronal kinematics again gives the highest average body speed, although the advantage over synchronous kinematics is reduced.

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“…An interesting phenomenon revealed by both acoustic [18], [19] and optical [11], [12], [20]- [22] observations is yielded by the primary US radiation force, also known as the Bjerknes force [23]. The radiation force originates from the phase difference between the driving pressure and the volume oscillation of a bubble.…”

mentioning

confidence: 99%

“…In early literature, approaches of this method are described in which the equations were linearized under the assumption of small radial motion (acoustic limit) [18], [20], [24], [25]. The time-domain evaluation of the differential equations [11], [26], [27] has later allowed for a better accounting of transient effects [28], as well as for the influence of the so-called added mass force, that considers the fluid motion surrounding the cavity [11], [26], [27].…”

mentioning

confidence: 99%

Method for Microbubble Characterization Using Primary Radiation Force

Vos

Guidi

Boni

et al. 2007

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Medical ultrasound contrast agents (UCAs) have evolved from straight image enhancers to pathophysiological markers and drug delivery vehicles. However, the exact dynamic behavior of the encapsulated bubbles composing UCAs is still not entirely known. In this article, we propose to characterize full populations of UCAs, by looking at the translational effects of ultrasound radiation force on each bubble in a diluted population. The setup involves a sensitive, fully programmable transmitter/receiver and two unconventional, real-time display modes. Such display modes are used to measure the displacements produced by irradiation at frequencies in the range 2-8 MHz and pressures between 150 kPa and 1. MPa. The behavior of individual bubbles freely moving in a water tank is clearly observed, and it is shown that it depends on the bubble physical dimensions as well as on the viscoelastic properties of the encapsulation. A new method also is distilled that estimates the viscoelastic properties of bubble encapsulation by fitting the experimental bubble velocities to values simulated by a numerical model based on the modifiedHerring equation and the Bjerknes force. The fit results are a shear modulus of 18 MPa and a viscosity of 0.23 Pas for a thermoplastic PVC-AN shell. Phospholipid shell elasticity and friction parameter of the experimental contrast agent are estimated as 0.8 N/m and 1 10 ;7 kg/s, respectively (shear modulus of 32 MPa and viscosity of 0.19 Pas, assuming 4-nm shell thickness).

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Spiraling Bubbles: How Acoustic and Hydrodynamic Forces Compete

Cited by 33 publications

References 10 publications

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Coordination of multiple appendages in drag-based swimming

Method for Microbubble Characterization Using Primary Radiation Force

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