Controlled Cavitation in Microfluidic Systems

Zwaan, Ed; Gac, Séverine Le; Tsuji, Kinko; Ohl, Claus‐Dieter

doi:10.1103/physrevlett.98.254501

Cited by 169 publications

(133 citation statements)

References 27 publications

(19 reference statements)

Supporting

Mentioning

125

Contrasting

Order By: Relevance

“…The flow reversal becomes more pronounced during bubble collapse. Figure 3 shows the projected bubble radius from figure 2 and compares it with the experimentally determined radii [2] and a 2-dimensional Rayleigh-Plesset equation, e.g. see [13].…”

Section: Cfd Results and Analysis Of The Flow Fieldmentioning

confidence: 99%

See 1 more Smart Citation

Shearing flow from transient bubble oscillations in narrow gaps

Mohammadzadeh

Ohl

2017

Phys. Rev. Fluids

Self Cite

View full text Add to dashboard Cite

The flow driven by a rapidly expanding and collapsing cavitation bubble in a narrow cylindrical gap is studied with the volume of fluid method. The simulations reveal a developing plug flow during the early expansion followed by flow reversal at later stages. An adverse pressure gradient leads to boundary layer separation and flow reversal, causing large shear stress near the boundaries. Analytical solution to a planar pulsating flow shows qualitative agreement with the CFD results. The shear stress close to boundaries has implications to deformable objects located near the bubble: experiments reveal that thin, flat biological cells entrained in the boundary layer become stretched, while cells with a larger cross-section are mainly transported with the flow.

show abstract

Section: Cfd Results and Analysis Of The Flow Fieldmentioning

confidence: 99%

“…These bubbles can be generated with a focused laser pulse [1][2][3], acoustically excited capillary waves [4], or through spark discharges [5]. Applications of these transient pulsating flows span cell stretching [6,7], liquid pumping [8], switching and sorting [9,10], mixing [11], and droplet generation [12].…”

Section: Introductionmentioning

confidence: 99%

Shearing flow from transient bubble oscillations in narrow gaps

Mohammadzadeh

Ohl

2017

Phys. Rev. Fluids

Self Cite

View full text Add to dashboard Cite

show abstract

“…Shock-wave induced jetting is conceptually similar to hydrodynamic jets, [26][27][28] which occur, for example, when cavitation bubbles collapse near a wall, 29,30 or the Worthington jet following the impact of a drop onto a deep pool of liquid, with the subsequent collapse of the crater. Similar jets also form in large-amplitude Faraday waves which are forced until they break [31][32][33] and even from oscillating drops.…”

Section: Spray and Microjets Produced By Focusing A Laser Pulse Into mentioning

confidence: 99%

Spray and microjets produced by focusing a laser pulse into a hemispherical drop

et al. 2009

View full text Add to dashboard Cite

Articles you may be interested inJet atomization and cavitation induced by interactions between focused ultrasound and a water surfacea) Phys. Fluids 26, 097105 (2014) We use high-speed video imaging to study laser disruption of the free surface of a hemispheric drop. The drop sits on a glass surface and the Nd:YAG ͑yttrium aluminum garnet͒ laser pulse propagates through the drop and is focused near the free surface from below. We focus on the evolution of the cylindrical liquid sheet and spray which emerges out of the drop and resembles typical impact crowns. The tip of the sheet emerges at velocities over 1 km/s. The tip of the crown breaks up into fine spray some of which is sucked back into the growing cavity at about 100 m/s. We measure the size of the typical spray droplets to be about 3 m. We also show the formation of fine microjets, which are produced when the laser is focused inside the drop and the shock front hits small bubbles sitting under the free surface. For water these microjets are 5 -50 m in diameter and exit at 100-250 m/s. For higher viscosity drops, these jets can emerge at over 500 m/s.

show abstract

“…[1][2][3][4][5][6] The flow of liquid surrounding the bubbles becomes approximately two-dimensional, and therefore the bubbles may be considered to be cylindrical in shape.…”

Section: Introductionmentioning

confidence: 99%

Models of cylindrical bubble pulsation

Ilinskii

Zabolotskaya

Hay

et al. 2012

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

Three models are considered for describing the dynamics of a pulsating cylindrical bubble. A linear solution is derived for a cylindrical bubble in an infinite compressible liquid. The solution accounts for losses due to viscosity, heat conduction, and acoustic radiation. It reveals that radiation is the dominant loss mechanism, and that it is 22 times greater than for a spherical bubble of the same radius. The predicted resonance frequency provides a basis of comparison for limiting forms of other models. The second model considered is a commonly used equation in Rayleigh-Plesset form that requires an incompressible liquid to be finite in extent in order for bubble pulsation to occur. The radial extent of the liquid becomes a fitting parameter, and it is found that considerably different values of the parameter are required for modeling inertial motion versus acoustical oscillations. The third model was developed by V. K. Kedrinskii [Hydrodynamics of Explosion (Springer, New York, 2005), pp. 23-26] in the form of the Gilmore equation for compressible liquids of infinite extent. While the correct resonance frequency and loss factor are not recovered from this model in the linear approximation, it provides reasonable agreement with observations of inertial motion.

show abstract

Controlled Cavitation in Microfluidic Systems

Cited by 169 publications

References 27 publications

Shearing flow from transient bubble oscillations in narrow gaps

Shearing flow from transient bubble oscillations in narrow gaps

Spray and microjets produced by focusing a laser pulse into a hemispherical drop

Models of cylindrical bubble pulsation

Contact Info

Product

Resources

About