Nonlinear problems of cavitation breakdown of liquids under explosive loading (review)

Kedrinskii, V. K.

doi:10.1007/bf00864788

Cited by 16 publications

(16 citation statements)

References 9 publications

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“…1b) proposed in [9] was implemented on the setup. This model is consistent with the breakdown formulations, mechanism, and structure for ordinary liquids under dynamic loading [3]: upon the breakdown of the chilled magma plug (diaphragm), the magma moves upward in the channel. The pressure drop results in the formation of several zones of state in the magma: the flow remains homogeneous only near the channel mouth; further upstream there is nucleation and a cavitation zone forms, which during diffusion of the dissolved gas into bubbles becomes a foam type structure.…”

Section: Flow Structure Dynamics For Explosive and Extrusive (Low-velsupporting

confidence: 68%

“…The next two frames show the flow structure of the same liquid at a late time [general view (c) and an enlarged image (d) of the same segment in the same scale as frame b]. It is evident that in the initial stage of the breakdown, transition from a cavitating liquid to a foam structure, which is characteristic of water [3], is also observed for a liquid with a two orders of magnitude higher viscosity (see Fig. 2b).…”

Section: Flow Structure Dynamics For Explosive and Extrusive (Low-velmentioning

confidence: 87%

“…The dynamics of disintegration of the liquid phase (its fragmentation) is not fully understood. Current emphasis is on the mechanism of cavitation breakdown; for water, it has been studied in experiments with hydrodynamic shock tubes using flash radiography and precision diagnostics of the breakdown process as the inversion of the two-phase state of the liquid -transition of the system from a cavitating to a gas-droplet state [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Explosive Eruption of Volcanoes: Some Approaches to Simulation

Kedrinskii

Makarov

Stebnovskii

et al. 2005

Combust Explos Shock Waves

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This paper gives results from experimental studies of the structure dynamics of liquid samples with viscosity in the range 0.001-2.6 Pa · sec during their breakdown as a result of dynamic decompression. Studies of the breakdown of liquid mixtures and liquids saturated with carbon dioxide have shown that in the indicated range of viscosity, the breakdown develops by a combination mechanism which involves the development of bubble cavitation and the formation of a system of large bubble clusters and gas slugs in them due to bubble coalescence. In this case, the flow structure changes markedly: discontinuous flow with vertical flow stratification develops accompanied by separation into jets with their subsequent breakup into drops. The probability of the presence of crystalline clusters in magma and their effect on the structure of "cavitating magma-crystalline clusters" type flows is discussed.

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Section: Flow Structure Dynamics For Explosive and Extrusive (Low-velsupporting

confidence: 68%

Section: Flow Structure Dynamics For Explosive and Extrusive (Low-velmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Explosive Eruption of Volcanoes: Some Approaches to Simulation

Kedrinskii

Makarov

Stebnovskii

et al. 2005

Combust Explos Shock Waves

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“…gives rise to pore growth, which leads to fracture of the liquids. Ill water, for example, the total amount of heterogeneities with characteristic dimeiL~ions of 0.0(}1-10 #m is 10 ' -10 ~i cm -3 [8,9]. Of all the impurities in the liquid, only bubbles in the bulk and in small cracks of undiluted particles can have a considerable effect on its strength [7].…”

mentioning

confidence: 99%

Strength of water under pulsed loading

Bogach¹,

Уткин²

2000

J Appl Mech Tech Phys

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EzTeT~ments we~ perfo~ncd to study the strength of water under conditions of pulsed extension. which is typical of the interaction between a triangular compression pulse and a free surface.The tests were perfo~ned in a wide (40-1000 MPa) range of 'variation According to theoretical concepts, liquids can sustain considerable tensile stresses reaching 1()0-1000 MPa [1][2][3]. At the same time, much smaller values were obtained in static tests (see [4]) and in cavitation studies in an intense acoustic field [5--7]. This discrepancy is due to the fact that in real liquids, the presence of heterogeneous sites (interfaces, solid inclusions, g~/.s bubbles, etc.) gives rise to pore growth, which leads to fracture of the liquids. Ill water, for example, the total amount of heterogeneities with characteristic dimeiL~ions of 0.0(}1-10 #m is 10 ' -10 ~i cm -3 [8,9]. Of all the impurities in the liquid, only bubbles in the bulk and in small cracks of undiluted particles can have a considerable effect on its strength [7].The strength of tt'm liquid under (lynamic loading is closer to the theoretical value. Ill the present study. for dymunic extension of the li(luid, we use sI)alling phenomena that occur in tile reflection of compression pulses fronl the free. surface of the substance to be examined [10]. The advantage of this approach is that tlm fracture caused by 1-#see pulses is volume (the effect of tim boundaries is negligible) and occurs ill a thin layer of the substance. This leads to a decre~sed nunlber of heterogeneous sites that can influence the fracture of the liquid. Moreover, the precompression in the shock wave is likely to result ill the collapse of the pores, which also intensifies homogeneous nucleation.The pulsed extension of liquids under shock-wave loading was used to study the cavitation of glycerin [11][12][13], water [14][15][16], ethyl(me glycol [15], ethanol [16], and mercury [17]. Glycerin is most extensively studied, for which a relation between the spall strength and the temperature was (tetermined [13] and it was shown that at 20~ its strength is equal to 60 MPa for any (tefbrmation rate [12]. The vahms of the spall fracture of water obtained by different authors differ by several orders (from 3.9 MPa [15] to 400 MPa [18]). There are no reliable experimental data on how tile deformation conditions influence the character of fracture. At tile same time, the phenonmnon of cavit[ttion is of considerable practical interest, which stinmlates the study of tile behavior of water upon I)ulsed extension. In this paper, the results of experimental deterinimttion of ttm spall strength of water are given fi)r wide ranges of compression-pulse amplitudes and durations and tile question as to whether tile honlogeneous-nucleation model can be used to interpret tlle results obt~dned is considered.

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“…These cavities may nucleate from random molecular fluctuations [5,6] (homogeneous nucleation) or from pre-existing cavities: including free bubbles or bubbles located on impurities within the liquid [7] (heterogeneous nucleation). At low strain rates or in contaminated liquids, heterogeneous nucleation is likely to dominate void formation and growth, however for pure liquids undergoing dynamic stretching within the bulk liquid, homogeneous nucleation may play a significant role in the cavitation process [8].…”

Section: Introductionmentioning

confidence: 99%

Dynamic tensile strength of silicone oils

Huneault

Kamil

Higgins

et al. 2018

AIP Conference Proceedings

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Abstract. The spall strength of polydimethylsiloxane silicone oils has been studied using the planar impact of thin flyers to generate large transient negative pressures near the free surface of target samples. The liquids were contained within sealed capsules in which a 4-µm-thick aluminized Mylar diaphragm formed a free surface at the back of the sample. The liquid targets were impacted by PMMA flyers at velocities ranging from 130 to 700 m/s using a 64-mm-bore gas-gun, thus allowing for large variations in the strain rate and incident shock pressure. The peak tension in the liquid was determined by monitoring the free surface velocity using a photonic Doppler velocimetry (PDV) system. The paper focuses on the study of a system of silicone oils having vastly different viscosities (5 cSt to 1000 cSt), but otherwise similar liquid properties. The effect of viscosity on spall strength is compared to previously published data and models.

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Nonlinear problems of cavitation breakdown of liquids under explosive loading (review)

Cited by 16 publications

References 9 publications

Explosive Eruption of Volcanoes: Some Approaches to Simulation

Explosive Eruption of Volcanoes: Some Approaches to Simulation

Strength of water under pulsed loading

Dynamic tensile strength of silicone oils

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