Growth and collapse of a vapour bubble in a microtube: the role of thermal effects

Sun, Chao; Can, Edip; Dijkink, Rory; Lohse, Detlef; Prosperetti, Andréa

doi:10.1017/s0022112009007381

Cited by 66 publications

(58 citation statements)

References 17 publications

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“…In particular, the asymmetry of the bubble oscillation, having a faster expansion than the collapse, is captured in the VOF simulation. Interestingly, this asymmetry was attributed previously and in a different geometry to thermal effects [32], while the present calculations ignore thermal effects. Thus, for the present case the asymmetry is a result of viscosity, i.e.…”

Section: Cfd Results and Analysis Of The Flow Fieldsupporting

confidence: 61%

Shearing flow from transient bubble oscillations in narrow gaps

Mohammadzadeh

Ohl

2017

Phys. Rev. Fluids

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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.

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Section: Cfd Results and Analysis Of The Flow Fieldsupporting

confidence: 61%

Shearing flow from transient bubble oscillations in narrow gaps

Mohammadzadeh

Ohl

2017

Phys. Rev. Fluids

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“…Focused nanosecond pulses have for instance been used to induce cavitation in liquids confined in capillary tubes (Vogel et al 1996;Sun et al 2009;Tagawa et al 2012), or jetting and spraying in sessile drops (Thoroddsen et al 2009). These situations involving a liquid close to a wall result in localized flows.…”

Section: Introductionmentioning

confidence: 99%

Drop deformation by laser-pulse impact

et al. 2016

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A free-falling absorbing liquid drop hit by a nanosecond laser-pulse experiences a strong recoil-pressure kick. As a consequence, the drop propels forward and deforms into a thin sheet which eventually fragments. We study how the drop deformation depends on the pulse shape and drop properties. We first derive the velocity field inside the drop on the timescale of the pressure pulse, when the drop is still spherical. This yields the kinetic-energy partition inside the drop, which precisely measures the deformation rate with respect to the propulsion rate, before surface tension comes into play. On the timescale where surface tension is important the drop has evolved into a thin sheet. Its expansion dynamics is described with a slender-slope model, which uses the impulsive energy-partition as an initial condition. Completed with boundary integral simulations, this two-stage model explains the entire drop dynamics and its dependance on the pulse shape: for a given propulsion, a tightly focused pulse results in a thin curved sheet which maximizes the lateral expansion, while a uniform illumination yields a smaller expansion but a flat symmetric sheet, in good agreement with experimental observations. IntroductionA laser pulse interacting with an absorbing liquid body can deposit a finite amount of energy, concentrated both in time and space, which eventually triggers a dramatic hydrodynamic response. Focused nanosecond pulses have for instance been used to induce cavitation in liquids confined in capillary tubes (Vogel et al. 1996;Sun et al. 2009;Tagawa et al. 2012), or jetting and spraying in sessile drops (Thoroddsen et al. 2009). These situations involving a liquid close to a wall result in localized flows. By contrast, we consider here the situation of a mobile liquid body: the impact of a nanosecond laser pulse onto an absorbing unconfined liquid drop, which, as first described by Klein et al. (2015), has a global hydrodynamic response to the pulse: the drop propels forward at a speed of several meters per second, strongly deforms and eventually fragments (see Fig. 1). This dynamics is similar to that following a mechanical impact such as on a solid substrate or a pillar, which has been studied thoroughly (see e.g. Clanet et al. 2004;Yarin 2006;Villermaux & Bossa 2011;Kolinski et al. 2012;Riboux & Gordillo 2014;Josserand & Thoroddsen 2016), including a few studies on the fragmentation of the drop (Villermaux 2007;Xu et al. 2007;Villermaux & Bossa 2009, 2011Riboux & Gordillo 2014). A laser proves to be an adequate tool to vary the extension of the impact without arXiv:1512.02415v1 [physics.flu-dyn] 8 Dec 2015

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“…3 (b). In the second scenario (H 2 ), the bubble grows and collapses quasi-symmetrically in time, in contrast to the work by Zwaan et al [35] in non-confined conditions, and Sun et al [17] in microtubes in which the bubble growth is always faster than bubble collapse. We attribute this observation to viscous dissipation effects given by boundary layer development during expansion and collapse, which are more pronounced in our lower energy experimental conditions.…”

Section: Resultsmentioning

confidence: 67%

Microfluidics control the ballistic energy of thermocavitation liquid jets for needle-free injections

Galvez

Fraters

Offerhaus

et al. 2020

Journal of Applied Physics

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Illuminating a water solution with a focused continuous wave laser produces a strong local heating of the liquid that leads to the nucleation of bubbles, also known as thermocavitation. During the growth of the bubble, the surrounding liquid is expelled from the constraining microfluidic channel through a nozzle, creating a jet. The characteristics of the resulting liquid jet was imaged using ultra-fast imaging techniques. Here, we provide a phenomenological description of the jet shapes and velocities, and compare them with a Boundary Integral numerical model. We define the parameter regime, varying jet speed, taper geometry and liquid volume, for optimal printing, injection and spray applications. These results are important for the design of energy-efficient needle-free jet injectors based on microfluidic thermocavitation. arXiv:2003.00934v1 [physics.flu-dyn]

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Growth and collapse of a vapour bubble in a microtube: the role of thermal effects

Cited by 66 publications

References 17 publications

Shearing flow from transient bubble oscillations in narrow gaps

Shearing flow from transient bubble oscillations in narrow gaps

Drop deformation by laser-pulse impact

Microfluidics control the ballistic energy of thermocavitation liquid jets for needle-free injections

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