Ultrasonic detection of moving interfaces in gas–liquid two-phase flow

Murai, Yuichi; Tasaka, Yuji; Nambu, Yasusada; Takeda, Yasushi

doi:10.1016/j.flowmeasinst.2010.03.007

Cited by 114 publications

(50 citation statements)

References 24 publications

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“…The detailed dynamics of the surface detachment during surface switching is illustrated in figures 9 and 10 for the Sw region, where Re = 1.46 × 10 5 (F r = 5.55). Figure 9 shows the time series of the surface height h(t) and the radial distance to the air-water interface r i (t), which was determined using the algorithm developed by Murai et al (2010). It should be noted that the local maximum of r i (t) corresponds to half of the width of the surface shape at the measured height.…”

Section: Dynamical Flow Change During Surface Detachmentmentioning

confidence: 99%

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Dynamics of flow structures and surface shapes in the surface switching of rotating fluid

Iima

Tasaka

2016

J. Fluid Mech.

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We present a study of the dynamics of the free surface shape of a flow in a cylinder driven by a rotating bottom. Near the critical Reynolds number of the laminar-turbulent transition of the boundary layer, the free surface exhibits irregular surface switching between an axisymmetric and non-axisymmetric shapes, and the switching often occurs with significant change of the free surface height. Although such surface deformation is known to be caused by the flow structures, the detailed flow structures of a rotating fluid with a large surface deformation have yet to be analysed. We thus investigate the velocity distribution and surface shape dynamics and show that the flow field during the loss of its axisymmetry is similar to that predicted by the theory of Tophøj, Mougel, Bohr, and Fabre (Phys. Rev. Lett., vol.110, 194502, 2013). The slight difference observed by quantitative comparison is caused by the fact that the basic flow of our study contains a weak rigid-body rotation in addition to the potential flow assumed by the theory. Furthermore, the observed non-axisymmetric surface shape, which has an elliptic horizontal cross section, is generally associated with a quadrupole vortex structure. It is also found that the relative position between the free surface and the flow structure changes before and after the detachment of the free surface from the bottom. The change just after the detachment is drastic and occurs via a transient dipole-like vortex structure.

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Section: Dynamical Flow Change During Surface Detachmentmentioning

confidence: 99%

“…Simultaneous detection of the air-water interface and the flow field is particularly critical to this purpose. The interface is successfully detected by the combined use of the Doppler and Echo methods developed by Murai et al (2010). One-dimensional velocity profile data measured by ultrasonic velocity profiling (UVP) are employed.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of flow structures and surface shapes in the surface switching of rotating fluid

Iima

Tasaka

2016

J. Fluid Mech.

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“…For gas-liquid combinations, three kinds of waveform analysis were proposed to obtain automated interfacial detection [15]. Based on the technique, we also developed an ultrasound void-fraction profiler [11] and ultrasound viscometry [17] for bubbly two-phase flow regimes.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound Flow-Monitoring and Flow-Metering of Air–Oil–Water Three-Layer Pipe Flows

et al. 2017

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The combined use of ultrasound pulse-echo intensity and Doppler shift frequency is examined as a means to measure strong unsteady three-phase pipe flows of a gas and two liquids. With air, oil, and water as components of the fluid media, particular attention is given to analyze ultrasound responses at the air-oil and oil-water interfaces. Reciprocating slugging is generated inside a 55-mm-diameter circular pipe, of which edges oscillate vertically at a controlled frequency. We use an ultrasound velocity profiler to obtain the 1-D cross-sectional distributions of the instantaneous flow velocity at the sampling rate of 60 Hz. All the measurements are realized by a single ultrasound transducer located outside the pipe. Measurement accuracy is validated using a high-speed camera coupled with particle image velocimetry that is synchronized with the profiler. The results demonstrate that the proposed technique works properly in sensing both interfaces as well as in-phase flow velocity distributions. In addition, multiphase volume flow rates for the constituents are obtained by velocity profile integration assuming vertical phase stratification in an approximation.INDEX TERMS Doppler method, flow metering, multiphase flow, particle image velocimetry, pipe flow, pipe line, ultrasound

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“…Based on the fact that ultrasonic echo signals contain abundant flow structure information in twophase fl ow, Wada et al (2006) measured the delay time and energy intensity of ultrasonic echoes to monitor the fl ow pattern evolution of gas-liquid two-phase fl ow. In addition, further progress has been made using the ultrasonic scattering effect (Murai et al, 2010), acoustic resonance spectroscopy (Cong et al, 2008), ultrasonic Doppler technology (Morriss and Hill, 1993;Dong et al, 2015), and the ultrasonic tomography technique (Xu et al, 1997;Supardan et al, 2007) in measuring phase volume fraction and phase velocity.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic method for measuring water holdup of low velocity and high-water-cut oil-water two-phase flow

et al. 2016

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Oil reservoirs with low permeability and porosity that are in the middle and late exploitation periods in China's onshore oil fi elds are mostly in the high-water-cut production stage. This stage is associated with severely non-uniform local-velocity flow profiles and dispersed-phase concentration (of oil droplets) in oil-water two-phase flow, which makes it diffi cult to measure water holdup in oil wells. In this study, we use an ultrasonic method based on a transmission-type sensor in oil-water two-phase flow to measure water holdup in lowvelocity and high water-cut conditions. First, we optimize the excitation frequency of the ultrasonic sensor by calculating the sensitivity of the ultrasonic fi eld using the fi nite element method for multiphysics coupling. Then we calculate the change trend of sound pressure level attenuation ratio with the increase in oil holdup to verify the feasibility of the employed diameter for the ultrasonic sensor. Based on the results, we then investigate the effects of oildroplet diameter and distribution on the ultrasonic fi eld. To further understand the measurement characteristics of the ultrasonic sensor, we perform a flow loop test on vertical upward oilwater two-phase fl ow and measure the responses of the optimized ultrasonic sensor. The results show that the ultrasonic sensor yields poor resolution for a dispersed oil slug in water fl ow (D OS/W fl ow), but the resolution is favorable for dispersed oil in water fl ow (D O/W fl ow) and very fi ne dispersed oil in water fl ow (VFD O/W fl ow). This research demonstrates the potential application of a pulsed-transmission ultrasonic method for measuring the fraction of individual components in oil-water two-phase fl ow with a low mixture velocity and high water cut.

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Ultrasonic detection of moving interfaces in gas–liquid two-phase flow

Cited by 114 publications

References 24 publications

Dynamics of flow structures and surface shapes in the surface switching of rotating fluid

Dynamics of flow structures and surface shapes in the surface switching of rotating fluid

Ultrasound Flow-Monitoring and Flow-Metering of Air–Oil–Water Three-Layer Pipe Flows

Ultrasonic method for measuring water holdup of low velocity and high-water-cut oil-water two-phase flow

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