Enhancing acoustic cavitation using artificial crevice bubbles

A.G. Zijlstra; David Fernandez Rivas; Johannes G.E. Gardeniers; Michel Versluis; Detlef Lohse

doi:10.1016/j.ultras.2014.10.002

Enhancing acoustic cavitation using artificial crevice bubbles

A.G. Zijlstra, David Fernandez Rivas, Johannes G.E. Gardeniers, Michel Versluis, Detlef Lohse

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Abstract

We study the response of pre-defined cavitation nuclei driven continuously in the kHz regime (80, 100 and 200 kHz). The nuclei consist of stabilized gaspockets in cylindrical pits of 30 μμm diameter etched in silicon or glass substrates. It is found that above an acoustic pressure threshold the dynamics of the liquid–gas meniscus switches from a stable drum-like vibration to expansion and deformation, frequently resulting in detachment of microbubbles. Just above this threshold small bubbles are continuously and intermittently ejected. At elevated input powers bubble detachment becomes more frequent and cavitation bubble clouds are formed and remain in the vicinity of the pit bubble. Surprisingly, the resulting loss of gas does not lead to deactivation of the pit which can be explained by a rectified gas diffusion process.

Original language	English
Pages (from-to)	512-523
Number of pages	12
Journal	Ultrasonics
Volume	56
Early online date	18 Oct 2014
DOIs	https://doi.org/10.1016/j.ultras.2014.10.002
Publication status	Published - Feb 2015

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10.1016/j.ultras.2014.10.002

1-s2.0-S0041624X1400287X-mainFinal published version, 3.29 MBLicence: Taverne

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title = "Enhancing acoustic cavitation using artificial crevice bubbles",

abstract = "We study the response of pre-defined cavitation nuclei driven continuously in the kHz regime (80, 100 and 200 kHz). The nuclei consist of stabilized gaspockets in cylindrical pits of 30 μμm diameter etched in silicon or glass substrates. It is found that above an acoustic pressure threshold the dynamics of the liquid–gas meniscus switches from a stable drum-like vibration to expansion and deformation, frequently resulting in detachment of microbubbles. Just above this threshold small bubbles are continuously and intermittently ejected. At elevated input powers bubble detachment becomes more frequent and cavitation bubble clouds are formed and remain in the vicinity of the pit bubble. Surprisingly, the resulting loss of gas does not lead to deactivation of the pit which can be explained by a rectified gas diffusion process.",

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AU - Zijlstra, A.G.

AU - Fernandez Rivas, David

AU - Gardeniers, Johannes G.E.

AU - Versluis, Michel

AU - Lohse, Detlef

PY - 2015/2

Y1 - 2015/2

N2 - We study the response of pre-defined cavitation nuclei driven continuously in the kHz regime (80, 100 and 200 kHz). The nuclei consist of stabilized gaspockets in cylindrical pits of 30 μμm diameter etched in silicon or glass substrates. It is found that above an acoustic pressure threshold the dynamics of the liquid–gas meniscus switches from a stable drum-like vibration to expansion and deformation, frequently resulting in detachment of microbubbles. Just above this threshold small bubbles are continuously and intermittently ejected. At elevated input powers bubble detachment becomes more frequent and cavitation bubble clouds are formed and remain in the vicinity of the pit bubble. Surprisingly, the resulting loss of gas does not lead to deactivation of the pit which can be explained by a rectified gas diffusion process.

AB - We study the response of pre-defined cavitation nuclei driven continuously in the kHz regime (80, 100 and 200 kHz). The nuclei consist of stabilized gaspockets in cylindrical pits of 30 μμm diameter etched in silicon or glass substrates. It is found that above an acoustic pressure threshold the dynamics of the liquid–gas meniscus switches from a stable drum-like vibration to expansion and deformation, frequently resulting in detachment of microbubbles. Just above this threshold small bubbles are continuously and intermittently ejected. At elevated input powers bubble detachment becomes more frequent and cavitation bubble clouds are formed and remain in the vicinity of the pit bubble. Surprisingly, the resulting loss of gas does not lead to deactivation of the pit which can be explained by a rectified gas diffusion process.

U2 - 10.1016/j.ultras.2014.10.002

DO - 10.1016/j.ultras.2014.10.002

M3 - Article

SN - 0041-624X

VL - 56

SP - 512

EP - 523

JO - Ultrasonics

JF - Ultrasonics

ER -

Enhancing acoustic cavitation using artificial crevice bubbles

Abstract

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