Superstability of surface nanobubbles

Borkent, B.M.; Dammer, Stephan M.; Schönherr, Holger; Vancso, Gyula J.; Lohse, Detlef

doi:10.5510/ogp20110100059

Cited by 39 publications

(53 citation statements)

References 19 publications

(42 reference statements)

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“…If this scenario is true, prediction of the actual population of cavitation bubbles in practical situations will require that, among other things, one know not only the initial distribution of cavitation nuclei but also their dynamic behavior in which bubble-bubble interaction plays a significant role. Also, the present findings may be relevant to the study of the superstability of nanobubbles, 53 where the interaction between nanobubbles on a hydrophobic surface and cavitation microbubbles is seen. In that study, Borkent et al found experimentally that surface nanobubbles do not cavitate even for a sufficiently strong negative pressure, while cavitation bubbles originating from microscopic cracks are rapidly expanding.…”

Section: Discussionmentioning

confidence: 69%

Multibubble cavitation inception

Ida

2009

Physics of Fluids

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The inception of cavitation in multibubble cases is studied numerically and theoretically to show that it is different from that in single-bubble cases in several aspects. Using a multibubble model based on the Rayleigh-Plesset equation with an acoustic interaction term, we confirmed that the recently reported suppression of cavitation inception due to the interaction of non-identical bubbles can take place not only in liquid mercury but also in water, and we found that a relatively large bubble can significantly decrease the cavitation threshold pressure of a nearby small bubble. By examining in detail the transition region where the dynamics of the suppressed bubble changes drastically as the inter-bubble distance changes, we determined that the explosive expansion of a bubble under negative pressure can be interrupted and turn into collapse even though the far-field liquid pressure well exceeds the bubble's threshold pressure. Numerical results suggest that the interruption of expansion occurs when the bubble radius is exceeded by the instantaneous unstable equilibrium radius of the bubble determined using the total pressure acting on the bubble. When we extended the discussion to systems of larger numbers of bubbles, we found that a larger number of bubbles have a stronger suppression effect. The present findings would be useful in understanding the complex behavior of cavitation bubbles in practical applications where in general many cavitation nuclei exist and may interact with each other.Comment: 14 pages, 16 figures, RevTEX

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Section: Discussionmentioning

confidence: 69%

Multibubble cavitation inception

Ida

2009

Physics of Fluids

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“…With all these different methods they are found to behave differently than regular macroscopic bubbles. Surface nanobubbles behave peculiar in several ways: their contact angle is always much lower than expected from Young's law [8,9], they are stable against violent decompression [10], and in particular they are stable for much longer than expected: For such small bubbles one would expect a lifetime of order µs, due to the high Laplace pressure inside the bubbles which drives the gas into the liquid. On this last question many explanations were proposed, ranging from contamination that shields or limits the diffusive outflux of gas [11] to a dynamic equilibrium situation where lost gas is replenished [12,13].…”

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confidence: 95%

Why Surface Nanobubbles Live for Hours

2013

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We present a theoretical model for the experimentally found but counterintuitive exceptionally long lifetime of surface nanobubbles. We can explain why, under normal experimental conditions, surface nanobubbles are stable for many hours or even up to days rather than the expected microseconds. The limited gas diffusion through the water in the far field, the cooperative effect of nanobubble clusters, and the pinned contact line of the nanobubbles lead to the slow dissolution rate.

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“…However, the gas more or less reverts into the nuclei during the tensile stressing, and the high tensile strength is lost again when the tensile tail dies away. This explains observations of Borkent et al (2007) interpreted as superstability of surface nanobubbles, and shows that a conventional medical lithotripter pulse is not suited for tensile strength measurement.…”

Section: Discussionmentioning

confidence: 68%

Cavitation nuclei in water exposed to transient pressures

Andersen

Mørch

2015

J. Fluid Mech.

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A model of skin-stabilized interfacial cavitation nuclei and their response to tensile and compressive stressing is presented. The model is evaluated in relation to experimental tensile strength results for water at rest at the bottom of an open water-filled container at atmospheric pressure and room temperature. These results are obtained by recording the initial growth of cavities generated by a short tensile pulse applied to the bottom of the container. It is found that the cavitation nuclei shift their tensile strength depending on their pressure history. Static pressurization for an extended period of time prior to testing is known to increase the tensile strength of water, but little information is available on how it is affected by compression pulses of short duration. This is addressed by imposing compression pulses of approximately 1 ms duration and a peak intensity of a few bar prior to the tension pulse. The observations are interpreted on the basis of the new model.

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Superstability of surface nanobubbles

Cited by 39 publications

References 19 publications

Multibubble cavitation inception

Multibubble cavitation inception

Why Surface Nanobubbles Live for Hours

Cavitation nuclei in water exposed to transient pressures

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