Characteristics and Calculation of Cavitation Mixers

Spiridonov, E. K.

doi:10.1016/j.proeng.2015.12.148

Cited by 10 publications

(3 citation statements)

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“…In the mentioned cases the formation of bubbles is usually not desired. There are other research fields and applications in which bubble formation is desired, e.g., the cleaning of surfaces (Verhaagen and Fernandez Rivas 2015;Bolanos-Jimenez et al 2017), the removal of bacteria and germs in water (Sarc et al 2016), the fragmentation of kidney stones in the human body by acoustic cavitation called lithotripsy, the targeted release of pharmacological agents (both Brennen 2015) and the enhancement of the efficiency of mixing processes (Spiridonov 2015).…”

Section: Introductionmentioning

confidence: 99%

Bubble nucleation from micro-crevices in a shear flow

et al. 2017

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The formation of gas bubbles at gas cavities located in walls bounding the flow occurs in many technical applications, but is usually hard to observe. Even though, the presence of a fluid flow undoubtedly affects the formation of bubbles, there are very few studies that take this fact into account. In the present paper new experimental results on bubble formation (diffusiondriven nucleation) from surface nuclei in a shear flow are presented. The observed gas-filled cavities are micrometre-sized blind holes etched in silicon substrates. We measure the frequency of bubble generation (nucleation rate), the size of the detaching bubbles and analyse the growth of the surface nuclei. The experimental findings support an extended understanding of bubble formation as a self-excited cyclic process and can serve as validation data for analytical and numerical models.

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Section: Introductionmentioning

confidence: 99%

Bubble nucleation from micro-crevices in a shear flow

et al. 2017

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“…Yet, cavitation has its useful applications. It is used to clean surfaces [3], fragment kidney stones in the human body [4] and enhance the efficiency of mixing processes [5].…”

Section: Introductionmentioning

confidence: 99%

The Role of Diffusion-Driven Nucleation in Hydrodynamic Cavitation

Groß¹,

Terwort²,

Ludwig³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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“…Diffusion-driven nucleation from surface nuclei in hydrodynamic cavitation 139 the removal of bacteria and germs in water (Sarc, Oder & Dular 2016), the fragmentation of kidney stones in the human body by acoustic cavitation called lithotripsy, the targeted release of pharmacological agents (both Brennen 2015), and the enhancement of the efficiency of mixing processes (Spiridonov 2015) are only examples for the far-reaching application of hydrodynamic and acoustic cavitation. In the present paper the focus is on hydrodynamic cavitation.…”

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confidence: 99%

Diffusion-driven nucleation from surface nuclei in hydrodynamic cavitation

Groß

Pelz

2017

J. Fluid Mech.

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Investigations about the role of nuclei and nucleation for the inception and formation of cavitation have been part of cavitation research since Harvey et al. (J. Cell. Physiol., vol. 24 (1), 1944, pp. 1-22) postulated the existence of gas filled crevices on surfaces and particles in liquids. In a supersaturated liquid, surface nuclei produce small gas bubbles due to mass transfer of gas or themselves work as weak spots in the liquid that are necessary for a phase change under technically relevant static pressures. Although various theories and models about nuclei and nucleation have found their way into standard literature, there is a lack of experimentally validated theories that describe the process of diffusion-driven nucleation in hydrodynamic cavitation. In order to close this gap we give new theoretical insights into the physics of this nucleation mechanism at technically relevant low supersaturations validated with extensive experimental results. The nucleation rate, the number of produced bubbles per second, is proportional to the supersaturation of the liquid and shows a nonlinear dependence on the shear rate at the surface nucleus. A model for the Strouhal number as dimensionless nucleation rate is derived allowing the estimation of nucleation rates from surface nuclei in hydrodynamic cavitation. The model provides three asymptotes, being a function of Péclet number, Weber number, the supersaturation of the liquid ζ and gas solubility Λ for three different detachment mechanisms, Sr ∝ ζ ΛWe n Pe 1/3 with n = 1/3, 3/4, 1. The theoretical findings are in good agreement with experimental results, leading to a new assessment of the role of diffusion in cavitating flows.

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Characteristics and Calculation of Cavitation Mixers

Cited by 10 publications

References 0 publications

Bubble nucleation from micro-crevices in a shear flow

Bubble nucleation from micro-crevices in a shear flow

The Role of Diffusion-Driven Nucleation in Hydrodynamic Cavitation

Diffusion-driven nucleation from surface nuclei in hydrodynamic cavitation

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