On the volume oscillations of a tethered bubble

Maksimov, A. O.

doi:10.1016/j.jsv.2004.05.021

Cited by 37 publications

(25 citation statements)

References 13 publications

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“…The Minnaert frequency for a bubble on a flat substrate is reduced by a factor 0.8 for contact angles of between 0 and 90°. 40 Another characteristic frequency of bubble perturbations is due to shape oscillations of the bubble surface. The oscillation modes of bubbles attached to a substrate have recently been studied in detail by Vejrazka et al 41 Here, the normal-mode frequencies scale with (γ/ρd 3 ) 1/2 .…”

Section: Discussionmentioning

confidence: 99%

Bubble Formation at a Gas-Evolving Microelectrode

et al. 2014

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The electrolytic production of gas bubbles involves three steps--nucleation, growth, and detachment. Here the growth of hydrogen bubbles and their detachment from a platinum microelectrode of diameter 125 μm are studied using high-speed photography and overpotential frequency spectrum (noise) analysis. The periodic release of large <800 μm bubbles--gas oscillator behavior--was often observed, with a corresponding periodic oscillation of the overpotential which is reflected as a main peak and a series of harmonics in the power spectral density. The release frequency is inversely correlated with the bubble size and hydrogen production rate. When the coalescence of bubbles at the electrode surface is inhibited, either chemically with a surfactant or ethylene glycol or hydrodynamically by magnetically induced convection, swarms of small ∼50 μm bubbles are released in an aperiodic stream. The abrupt transition from periodic to aperiodic release occurs when the surface tension falls below 70 mN m(-1). Hydrogen bubble growth is also studied on a transparent platinum thin-film electrode, where the bubble coalescence can be observed directly. It leaves sessile droplets of electrolyte within the footprint of the growing bubble, showing that the growth involves scavenging smaller bubbles from solution due to hydrogen generated directly at the electrode. A possible role of nanobubbles in the lift-off process is discussed.

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Section: Discussionmentioning

confidence: 99%

Bubble Formation at a Gas-Evolving Microelectrode

et al. 2014

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“…7(a)] is assumed, the extra inertia would decrease the frequency of the breathing mode by a factor of $0.8 compared to its free field value. 45,58 Application of a similar scaling factor would produce modified frequencies f 0 l of f 0 4 ¼ 9.4 6 1.3 kHz, f 0 5 ¼ 12.8 61.3 kHz, and f 0 6 ¼ 16.6 6 2.3 kHz. This would apparently reconcile the mode frequency with the apparent l ¼ 5 shape of Fig.…”

Section: Parameter Valuementioning

confidence: 99%

Investigation of noninertial cavitation produced by an ultrasonic horn

Birkin

Offin

Vian

et al. 2011

The Journal of the Acoustical Society of America

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This paper reports on noninertial cavitation that occurs beyond the zone close to the horn tip to which the inertial cavitation is confined. The noninertial cavitation is characterized by collating the data from a range of measurements of bubbles trapped on a solid surface in this noninertial zone. Specifically, the electrochemical measurement of mass transfer to an electrode is compared with high-speed video of the bubble oscillation. This gas bubble is shown to be a "noninertial" event by electrochemical surface erosion measurements and "ring-down" experiments showing the activity and motion of the bubble as the sound excitation was terminated. These measurements enable characterization of the complex environment produced below an operating ultrasonic horn outside of the region where inertial collapse can be detected. The extent to which solid boundaries in the liquid cause the frequencies and shapes of oscillatory modes on the bubble wall to differ from their free field values is discussed.

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“…It is well known that the oscillation period of an inertial bubble near a boundary is prolonged. For hemispherical bubbles an increase of k = 1.2 has been measured [14,15] and is multiplied to the calculated radius R ss max . We compare the prediction of the model with the experiment by plotting simulations and experimental data of the resonance frequency as a function of the steady state R ss max .…”

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confidence: 99%

Oscillate boiling from microheaters

Gonzalez-Avila

Nguyen

et al. 2017

Phys. Rev. Fluids

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We report about an intriguing boiling regime occurring for small heaters embedded on the boundary in subcooled water. The microheater is realized by focusing a continuous wave laser beam to about 10 µm in diameter onto a 165 nm-thick layer of gold, which is submerged in water. After an initial vaporous explosion a single bubble oscillates continuously and repeatably at several 100 kHz. The microbubble's oscillations are accompanied with bubble pinch-off leading to a stream of gaseous bubbles into the subcooled water. The self-driven bubble oscillation is explained with a thermally kicked oscillator caused by the non-spherical collapses and by surface pinning. Additionally, Marangoni stresses induce a recirculating streaming flow which transports cold liquid towards the microheater reducing diffusion of heat along the substrate and therefore stabilizing the phenomenon to many million cycles. We speculate that this oscillate boiling regime may allow to overcome the heat transfer thresholds observed during the nucleate boiling crisis and offers a new pathway for heat transfer under microgravity conditions.Introduction.-The thermal energy transfer from a heater into a liquid is greatly increased once the boiling temperature is reached and vapor bubbles are formed. Then the previous convective driven flow becomes advected by the growing and detaching bubbles rising into the bulk under the action of gravity. By increasing the temperature of the heater further more bubbles are nucleated until a continuous vapor layer is formed [1]. In this so-called film boiling regime heat transfer is strongly reduced; this regime limits the design and efficiency of common heaters. To overcome this boiling crisis, research is focused on the enhancement of heat transfer while avoiding the transition to film boiling. Current promising approaches are the texturing of the heater surface [2] or the use of thin electrically heated wires [3]. Here we report a nucleate boiling regime on a flat substrate where the vapor bubble does not detach from the surface yet transports heat through a flow caused by bubble oscillations and thermocapillary stresses. This letter starts with a description of this unexpected oscillate boiling regime and relates the phenomenon with reports from literature having some similarity before we provide two simple models. The first model, based on a set of ordinary differential equations (ODEs), explains the orgin of the bubble oscillation and the dependency of the oscillation frequency on the heater power. The second model describes the thermal gradients and the resulting thermocapillary flow using a Navier Stokes solver which is compared to the experimental measurements. This novel oscillate boiling regime may allow to overcome the film boiling regime through an auto-oscillatory flow from a constant heat input.

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On the volume oscillations of a tethered bubble

Cited by 37 publications

References 13 publications

Bubble Formation at a Gas-Evolving Microelectrode

Bubble Formation at a Gas-Evolving Microelectrode

Investigation of noninertial cavitation produced by an ultrasonic horn

Oscillate boiling from microheaters

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