A benchmark experiment on gas cavitation

Peters, F.; Honza, Rene

doi:10.1007/s00348-014-1786-5

Cited by 10 publications

(7 citation statements)

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“…Investigations on bubble detachment from wall-orifices in liquid crossflows (Nahra and Kamonati 2003) and bubble detachment from surfaces in the important field of flow boiling (Chen et al 2012) underline the importance of this topic in other research fields. Peters and Honza (2014) were the first to systematically study diffusion-driven nucleation from surface nuclei using a laminar radial gap flow and silicone oil as liquid. The supersaturation of the liquid was given by the spatial pressure distribution in the flow.…”

Section: Introductionmentioning

confidence: 99%

“…Shear rates in the order of magnitude of 10 2 to 10 3 s −1 were realised. In Groß et al (2015) some of the authors of this paper continued the work of Peters and Honza (2014) and modified the experimental setup to conduct experiments with larger shear rates and achieved nucleation rates of up to 1 kHz . In Groß et al (2016) a channel with rectangular cross-section was used to study the bubble detachment.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Bubble nucleation from micro-crevices in a shear flow

et al. 2017

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“…More generally, the influence of free stream nuclei 18,19 in addition to noncondensable dissolved gas 20 on cavitation inception has already been evidenced and a hysteresis between inception and desinence is classically observed depending on these two parameters. Dissolved air concentrations and thus air bubbles' population can be particularly important in oil viscous flows, 21 with a typical Bunsen coefficient 22 from 7 to 12 Vol. %, 23 leading to similar cavitation inception hysteresis 24 than those classically observed in turbulent water flows.…”

Section: Introductionmentioning

confidence: 99%

Attached cavitation in laminar separations within a transition to unsteadiness

et al. 2019

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Attached sheet cavitation is usually observed in turbulent water flows within small laminar separation bubbles which can provide favorable conditions for inception and attachment of cavities. In the present study, viscous silicone oils are used within a small scale Venturi geometry to investigate attached cavitation into laminar separated flows for Reynolds numbers from 346 to 2188. Numerical simulations about single phase flows are performed with steady simulations for a Reynolds number range Re ∈ [50; 1400] and with unsteady simulations for Re ∈ [1000; 2000]. They reveal the emergence of two large laminar boundary layer separations downstream of the Venturi throat in addition to low pressure zones which can possibly induce both degassing or cavitation features. Experiments are performed with high-speed photography, and several multiphase dynamics are observed in these viscous flows, which are considered as quasisteady flows at low Reynolds numbers Re ≤ 1400. Degassing phenomenon with air bubble recirculation has been first observed at pressures far above liquid vapor pressure whereas typical attached cavities have been identified for low pressure conditions as "band" and "tadpole" cavities into the different separations of the laminar flows. For higher Reynolds numbers, a flow regime transition can be noticed in the wake of well-developed gas structures, characterized by wake instabilities, causing vortex cavitation above a critical Reynolds number associated with the bubble width Re b c ≃ 616. This regime transition can possibly occur either quasicontinuously in the wake of an attached "band" vapor cavity or intermittently behind a recirculating air bubble generated with degassing. This last phenomenon is associated in our study to classical "patch" cavitation.

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“…Wijngaarden and Parkin & Kermeen reported that forced convection in a fluid flow strongly enhances mass diffusion and thus the growth of a gas bubbles that might act as cavitation nuclei [9] [10]. Peters and Honza designed an experiment to investigate bubble formation at small crevices in a laminar flow and were able to observe nucleation rates of 0.1 Hz to 1 Hz [11]. They found out that the nucleation rate depends on the supersaturation of the liquid and the shear rate at the wall but did not provide any functional dependency.…”

Section: Introductionmentioning

confidence: 99%