Surge effect during the water exit of an axisymmetric body traveling normal to a plane interface: experiments and BEM simulation

Liju, P.-Y.; Machane, Rabha; Cartellier, Alain H.

doi:10.1007/s003480100277

Cited by 35 publications

(9 citation statements)

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“…The first contact time of the three phase-indicator functions is almost the same. This demonstrates the negligible effect of the probe on bubble behavior before the first contact and it is consistent with observation and analysis of the local interface deformation during piercing (Liju et al, 2001). Oppositely, the three last-contact times significantly differ.…”

Section: Probe Signal and Phase-indicating Functionssupporting

confidence: 89%

Measurement accuracy of a mono-fiber optical probe in a bubbly flow

Vejražka

Večeř

Orvalho

et al. 2010

International Journal of Multiphase Flow

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Section: Probe Signal and Phase-indicating Functionssupporting

confidence: 89%

Measurement accuracy of a mono-fiber optical probe in a bubbly flow

Vejražka

Večeř

Orvalho

et al. 2010

International Journal of Multiphase Flow

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“…Calculations using boundary element methods and potential flow assumption 11 show that, in general, the amplitude of this deformation is much smaller than the tip radius. 1͑a͔͒; when the probe tip approaches the bubble surface a deformation is produced due to the probe-induced liquid pressure over the bubble: The "surge effect".…”

Section: Literature Overviewmentioning

confidence: 99%

“…Barrau et al 5 reverse the explanation for optical probes by Carrica et al 7 and attribute the systematic underestimations observed in the optical probes measurements to the blinding effect. Outside the blind zone the underestimation of the chord length is very small since the surge effect 11 only gives a small deformation. The size of this region is based on a critical dimensionless radial coordinate for the piercing, instead of the tip radius.…”

Section: B Probe-bubble Interaction Mechanismsmentioning

confidence: 99%

“…1,5,6,8,9 The main focus in these investigations was on the transition of the probe from the liquid phase into the gas phase, as well as the selection of appropriate thresholds for an accurate algorithm. This was refined later for optical probes by Barrau et al 5 Investigations on the modification of the bubble shape by the probe have generally been focused on the piercing of a flat surface 1,11 or are based on assumptions about the piercing behavior. Especially criteria for lower amplitude signals without a plateau are unclear.…”

Section: Introductionmentioning

confidence: 99%

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On the accuracy of the void fraction measurements using optical probes in bubbly flows

Juliá

Harteveld

Mudde

et al. 2005

Review of Scientific Instruments

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Articles you may be interested inEffect of rolling motion on local characteristics of gas-liquid two-phase flow using an optical probe AIP Conf.Hydrogen bubble flow visualization of a self-oscillating cylinder vortex street "void" Phys. Fluids 17, 091104 (2005); 10.1063/1.1942516 Laser induced fluorescence measurements of dissolved oxygen concentration fields near air bubble surfaces Rev. Sci. Instrum. 71, 3494 (2000)The accuracy of the measurement of the void fraction in bubbly flows using an optical probe is investigated. Experiments were performed in tap water with ellipsoidal-shaped air bubbles with equivalent diameters and velocities in the range of 2.8-5.2 mm and 0.22-0.28 m/s. Comparison of charge coupled devices ͑CCD͒ images of dynamic bubble piercing events with optical probe signals shows that for piercing in the area around the bubble side, the so-called low-level criterion gives the best agreement with the actual gas-liquid transition for the undisturbed bubble. In addition, residence time underestimation due to a partial blinding effect is observed in the outer regions of the bubble. Residence times of the probe inside the bubble are obtained from the probe signal and from CCD images of the undisturbed bubble. These are compared to study the relevance of various probe-bubble interaction effects. The crawling effect is found to play an important role. For perpendicular piercing, the experiment shows that in the central area of the bubble deceleration effects induced by the probe lead to local overestimation of residence times. In the outer region of the bubble, large-scale deformation leads to local underestimation of residence times. The larger cross-sectional area associated with the underestimation leads to a net underestimation of the total bubble volume. For nonperpendicular piercing, the probe inclination is found to generate an additional drifting effect, creating an additional source of underestimation.

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“…The results at initial stage were compared with those from small-time expansion solution by Tyvand & Miloh (1995) and simulation was terminated before the breakup of the free surface or body piercing. Liju et al (2001) considered water exit of an axisymmetric body at different Froude number using BEM. Numerical result was compared with their experimental data from a model test in small scale.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of water exit of an initially fully submerged buoyant spheroid in an axisymmetric flow

Ni¹,

Wu²

2017

Fluid Dyn. Res.

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Abstract:Free water exit of an initially fully-submerged buoyant spheroid in an axisymmetric flow, which is driven by the difference between vertical fluid force and gravity, is investigated. The fluid is assumed to be incompressible and inviscid, and the flow to be irrotational. The velocity potential theory is adopted together with the fully nonlinear boundary conditions on the free surface.Surface tension has been neglected and the pressure is taken as constant on the free surface. The acceleration of the body at each time step is obtained as the part of the solution. Its nonlinear mutual dependence with the fluid force is decoupled through the auxiliary function method. The free-surface breakup by the body penetration and the water detachment from the body are treated through numerical conditions. Slender body theory based on the zero potential assumption on the undisturbed flat free surface is adopted, through which a condition for full water exit of a spheroid is obtained. Comparison is made between the results from the slender body theory and from the fully nonlinear theory through the boundary-element method, and good agreement is found when the spheroid is slender. Extensive case studies are undertaken to investigate the effects of the body density, dimensions and the initial submergence.

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Surge effect during the water exit of an axisymmetric body traveling normal to a plane interface: experiments and BEM simulation

Cited by 35 publications

References 0 publications

Measurement accuracy of a mono-fiber optical probe in a bubbly flow

Measurement accuracy of a mono-fiber optical probe in a bubbly flow

On the accuracy of the void fraction measurements using optical probes in bubbly flows

Numerical simulation of water exit of an initially fully submerged buoyant spheroid in an axisymmetric flow

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