Depression of the cavitation centers in water under pulsed tension conditions

Vinogradov, V. E.

doi:10.1134/s1063785009010167

Cited by 13 publications

(15 citation statements)

References 1 publication

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“…The main efforts of researchers have been spent on the experimental study of the conditions for formation of cavitation voids. Numerous experiments had shown that the negative pressure, at which cavitation voids are formed, is significantly different from the theoretically predicted, and is strongly dependent on the fluid temperature, presence of impurities, the amount of dissolved gas, and many other parameters (see, e.g., [4,5]). It should also be noted that the various methods of measuring the critical pressure, at which cavitation occurs, give very inconsistent results.…”

Section: Introductionmentioning

confidence: 81%

Cavitation in dielectric fluid in inhomogeneous pulsed electric field

Shneider

Pekker

2013

Journal of Applied Physics

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This paper proposes a method for studying the early stages of the cavitation development in arbitrary, non-stationary conditions. This method is based on the comparison of the results of calculations in the framework of a theoretical model of the liquid dielectrics motion in a strong non-uniform electric field and experiments with controlled parameters. This approach allows us to find the critical negative pressure, at which cavitation begins to develop, and to determine the values of the constants in the classical models of cavitation

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Section: Introductionmentioning

confidence: 81%

Cavitation in dielectric fluid in inhomogeneous pulsed electric field

Shneider

Pekker

2013

Journal of Applied Physics

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“…1). Consequently, the ponderomotive forces cause a significant electrostrictive tensile stress in the dielectric liquid, which can lead to a disruption of the continuity of liquid (creating nanopores), similar to those observed in [21,22,23]. For the formation of discontinuities, it is necessary that the absolute value of the negative pressure in the fluid reach the values on the order of 10-30MPa [22].…”

Section: Motion Of the Fluid Under The Action Of The Ponderomotivmentioning

confidence: 96%

Pre-breakdown processes in a dielectric fluid in inhomogeneous pulsed electric fields

Shneider

Pekker

2015

Journal of Applied Physics

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We consider the development of pre-breakdown cavitation nanopores appearing in the dielectric fluid under the influence of the electrostrictive stresses in the inhomogeneous pulsed electric field. It is shown that three characteristic regions can be distinguished near the needle electrode. In the first region, where the electric field gradient is greatest, the cavitation nanopores, occurring during the voltage nanosecond pulse, may grow to the size at which an electron accelerated by the field inside the pores can acquire enough energy for excitation and ionization of the liquid on the opposite pore wall, i.e., the breakdown conditions are satisfied. In the second region, the negative pressure caused by the electrostriction is large enough for the cavitation initiation (which can be registered by optical methods), but, during the voltage pulse, the pores do not reach the size at which the potential difference across their borders becomes sufficient for ionization or excitation of water molecules. And, in the third, the development of cavitation is impossible, due to an insufficient level of the negative pressure: in this area, the spontaneously occurring micropores do not grow and collapse under the influence of surface tension forces. This paper discusses the expansion dynamics of the cavitation pores and their most probable shape. I. Introduction.A mechanism for the rapid breakdown in the fluid, associated with the occurrence of cavitation ruptures under the influence of the electrostrictive forces near the needle electrode, was proposed in [1]. Later, a hydrodynamic model of compressible fluid motion under the influence of the ponderomotive electrostrictive forces in a non-uniform time dependent electric field was suggested in [2]. As shown in [2], if the voltage on the needle electrode is growing fast enough (a few nanoseconds), the negative stress is created in liquid, and it may be sufficient for the cavitation formation. A nanosecond breakdown, the beginning of which can be explained by the formation of cavitation in a stretched liquid due to electrostriction, was investigated experimentally in [3][4][5][6][7]. In [8], based on a theoretical model [2], it had been shown experimentally that the initial stage of development of a nanosecond breakdown in liquids is associated with the appearance of discontinuities in the liquid (cavitation) under the influence of electrostriction forces. The comparison of the experimentally measured area dimensions and its temporal development was found to be in a good agreement with the theoretical calculations. A theory of the cavitation initiation in inhomogeneous pulsed electric field was developed in [9], as well as the method that allows to determine the critical parameters, at which cavitation begins, on the basis of the comparison between the experiment and the simulation results within the framework of hydrodynamics of compressible fluids, was proposed.

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“…CO 2 has been found to decrease the number of cavities in water by preventing their activation due to the acidic nature of products formed upon dissolution [265]. In ultra-pure water no measurable acoustic noise spectra was detected for CO 2 indicating no cavitation events, conversely for O 2 a signal was found to be present [209].…”

Section: Gas Saturation Effectmentioning

confidence: 99%

“…Although CO 2 results in the formation of large, stable bubbles it is known to inhibit free radical production due to a reduction in active cavitation [150,265]. CO 2 has been found to decrease the number of cavities in water by preventing their activation due to the acidic nature of products formed upon dissolution [265].…”

Section: Gas Saturation Effectmentioning

confidence: 99%

A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

Wood

Lee

Bussemaker

2017

Ultrasonics Sonochemistry

250

137

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Please cite this article as: R.J. Wood, J. Lee, M.J. Bussemaker, A parametric review of sonochemistry: control and augmentation of sonochemical activity in aqueous solutions, Ultrasonics Sonochemistry (2017), doi: http:// dx.doi.org/10. 1016/j.ultsonch.2017.03.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A parametric review of sonochemistry: control and augmentation of sonochemical activity in aqueous solutions

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Depression of the cavitation centers in water under pulsed tension conditions

Cited by 13 publications

References 1 publication

Cavitation in dielectric fluid in inhomogeneous pulsed electric field

Cavitation in dielectric fluid in inhomogeneous pulsed electric field

Pre-breakdown processes in a dielectric fluid in inhomogeneous pulsed electric fields

A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

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