Application of ultrasonic multi-wave method for two-phase bubbly and slug flows

Murakawa, Hideki; Kikura, Hiroshige; Aritomi, Masanori

doi:10.1016/j.flowmeasinst.2007.06.010

Cited by 62 publications

(37 citation statements)

References 19 publications

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“…For example, in drift-flux model, bubble-rising velocity is required to calculate drift velocity. As a result, multiwave method [9,10] has been developed. By using two ultrasonic frequencies and signal processing, this method is able to measure bubble-rising velocity and liquid velocity separately at the same time and at the same position without need of velocity difference between the two phases.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Bubbly Two-phase Flow in Vertical Pipe Using Multiwave Ultrasonic Pulsed Dopller Method and Wire Mesh Tomography

et al. 2015

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Two measurement methods which are multiwave ultrasonic pulsed Doppler (multiwave UVP) method and wire mesh tomography (WMT) have been applied to the measurement of bubbly two-phase flow. Velocity profiles of bubbles and liquid have been measured using multiwave UVP. Simultaneously, cross-sectional void fraction distribution has been measured using WMT. As the result, a combination method has been set up. The measured parameters are indispensable in order to obtain detailed structures of two-phase flow. Multiwave UVP method exploits two basic ultrasonic frequencies which are 2 MHz and 8 MHz. Simultaneous measurement of velocity profiles of bubbles (using 2 MHz frequency) and those of liquid (using 8 MHz frequency), at the same position, is enabled. A multiwave ultrasonic transducer (multiwave TDX) which is able to emit and receive the two ultrasonic frequencies along the measurement line at the same time has been applied. The signal processing is based on the pulsed Doppler method. Using the combination method, first, instantaneous velocity profiles and void fraction distribution have been measured simultaneously for air-water counter-current bubbly flow in a vertical pipe. Flow structure has been clarified. Effect of initial condition on void fraction distribution has been confirmed. Next, measurements have been carried out for subcooled boiling bubbly flow in a vertical pipe. For measurement of subcooled boiling flow, a high temperature wire mesh sensor (WMS) has been developed. A method for separation of velocity profiles of bubbles with different sizes and velocities has been suggested.

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Section: Introductionmentioning

confidence: 99%

“…Therefore, it was difficult to synchronize the measured data of liquid with that of bubbles. The signal processing developed in [10] was based on the ultrasonic time-domain cross correlation (UTDC) method. It enabled synchronization of liquid data and bubble data.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Bubbly Two-phase Flow in Vertical Pipe Using Multiwave Ultrasonic Pulsed Dopller Method and Wire Mesh Tomography

et al. 2015

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“…It is due to the differences in acoustic impedances and diameters between them. Later on, Murakawa et al [8] employed multiwave TDX transducer and time domain cross-correlation method (UTDC) to separate liquid and bubble velocity profile. This technique could synchronise the instantaneous velocities of liquid and bubbles.…”

Section: Introductionmentioning

confidence: 99%

“…Some measurement technique for two-phase bubbly flow by UVP was developed to measure velocity profile of bubbly flow, and their system requires several types of equipment. For instance, the measurement system combines the UVP system and video data processing unit [5], and two basic frequencies were required [8]. As a consequence, the number of pulser-receiver and accessories has been doubled or more.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Measurement of Velocity Profile on Bubbly Flow Using Fast Fourier Transform (FFT) Technique

Wongsaroj

Hamdani

Thong-un

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In two-phase bubbly flow, measurement of liquid and bubble velocity is a necessity to understand fluid characteristic. The conventional ultrasonic velocity profiler (UVP), which has been known as a nonintrusive measurement technique, can measure velocity profile of liquid and bubble simultaneously by applying a separation technique for both phases (liquid and bubble) and transparent test section is unnecessary. The aim of this study was to develop a new technique for separating liquid and bubble velocity data in UVP method to measure liquid and bubble velocity profiles separately. The technique employs only single resonant frequency transducer and a simple UVP system. An extra equipment is not required. Fast Fourier Transform (FFT) based frequency estimator paralleled with other signal processing techniques, which is called as proposed technique, was proposed to measure liquid and bubble velocity separately. The experimental facility of two-phase bubbly flow in the vertical pipe was constructed. Firstly, the Doppler frequency estimation by using the FFT technique was evaluated in single-phase liquid flow. Results showed that FFT technique showed a good agreement with autocorrelation and maximum likelihood estimator. Then, separation of liquid and bubble velocity was demonstrated experimentally in the two-phase bubbly flow. The proposed technique confirmed that liquid and bubble velocity could be measured efficiently.

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“…To solve the problem of measuring the fluid flow rate, Roosnek (2000) reduced the crosstalk problem between ultrasonic transmission and the receiving terminal by using a realtime statistical method, and proposed a new algorithm based on the least squares method to calculate the ultrasonic transition time. Murakawa et al (2005Murakawa et al ( , 2008 utilized the sensitivity of ultrasonic frequency to particle scattering and adopted a multi-frequency ultrasonic method to simultaneously measure the flow rates of gas and liquid phases. The authors combined a ringshaped probe with a circular probe, which had different frequencies.…”

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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Application of ultrasonic multi-wave method for two-phase bubbly and slug flows

Cited by 62 publications

References 19 publications

Measurement of Bubbly Two-phase Flow in Vertical Pipe Using Multiwave Ultrasonic Pulsed Dopller Method and Wire Mesh Tomography

Measurement of Bubbly Two-phase Flow in Vertical Pipe Using Multiwave Ultrasonic Pulsed Dopller Method and Wire Mesh Tomography

Ultrasonic Measurement of Velocity Profile on Bubbly Flow Using Fast Fourier Transform (FFT) Technique

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

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