Cavitation Hysteresis

Holl, J. W.; Treaster, A. L.

doi:10.1115/1.3645802

Cited by 18 publications

(7 citation statements)

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“…In addition, cavitation inception at a low DOC ͑2 ppm͒ displays a time delay, which has also been mentioned in the work by Holl and Treaster. 88 The initial bubbles showed up after 30-60 min of lowering the exit pressure and made the experiments painstakingly slow. The hypothesis by Holl and Treaster 88 that the time delay increases on the reduction of size and the DOC seems to match the observed trends in the present experiments.…”

Section: Effects Of Dissolved Oxygen Concentrationmentioning

confidence: 99%

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Cavitation in flow through a micro-orifice inside a silicon microchannel

2004

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Hydrodynamic cavitation in flows through a micro-orifice entrenched in a microchannel has been detected and experimentally investigated. Microfabrication techniques have been employed to design and develop a microfluidic device containing an 11.5 m wide micro-orifice inside a 100.2 m wide and 101.3 m deep microchannel. The flow of de-ionized water through the micro-orifice reveals the presence of multifarious cavitating flow regimes. This investigation divulges both similarities and differences between cavitation in micro-orifices and cavitation in their macroscale counterparts. The low incipient cavitation number obtained from the current experiments suggests a dominant size scale effect. Choking cavitation is observed to be independent of any pressure or velocity scale effects. However, choking is significantly influenced by the small stream nuclei residence time at such scales. Flow rate choking leads to the establishment of a stationary cavity. Large flow and cavitation hysteresis have been detected at the microscale leading to very high desinent cavitation numbers. The rapid transition from incipient bubbles to choking cavitation and subsequent supercavitation suggests the presence of radically different flow patterns at the microscale. Supercavitation results in a thick cavity, which extends throughout the microchannel, and is encompassed by the liquid. Cavitation at the microscale is expected to considerably influence the design of innovative high-speed microfluidic systems.

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Section: Effects Of Dissolved Oxygen Concentrationmentioning

confidence: 99%

“…3,88,89 This is often used as a threshold between cavitating and noncavitating flows. The value of desinent cavitation has been reported to be slightly higher than the incipient cavitation by various authors in previous cavitation studies at the macroscale.…”

Section: G Desinent Cavitationmentioning

confidence: 99%

Cavitation in flow through a micro-orifice inside a silicon microchannel

2004

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“…x increases or decreases, was observed in some measurements that were carried out at the different rates of increasing the pressure ratio [18]. During every measurement, the pressure ratio is increasing linearly with time from zero to its maximum value and then at the same rate falling back to zero.…”

Section: Resultsmentioning

confidence: 88%

Simplified detection of cavitation threshold in control valves

Požar

Pirc

Susič³

et al. 2020

Applied Acoustics

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“…16 Venning et al 17 added that an important population of free gas nuclei can even impact developed partial cloud cavitation shedding mechanisms. 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.…”

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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Cavitation Hysteresis

Cited by 18 publications

References 0 publications

Cavitation in flow through a micro-orifice inside a silicon microchannel

Cavitation in flow through a micro-orifice inside a silicon microchannel

Simplified detection of cavitation threshold in control valves

Attached cavitation in laminar separations within a transition to unsteadiness

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