Simultaneous Measurement of Two-Phase Flow Parameters for Drift-Flux Model

Nguyen, Tat Thang

doi:10.18280/ijht.390434

Cited by 2 publications

(4 citation statements)

References 16 publications

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“…Presently literature review confirms the advantages of the Doppler method in two-phase flow measurement, e.g. see [12][13][14]. Thus, the Doppler method is exploited in this study.…”

Section: Introductionsupporting

confidence: 66%

Multiwave Ultrasonic Doppler Method for Bubbly Two-Phase Taylor Couette Flow Measurement

Thắng¹

2022

IJHT

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Ultrasonic methods, such as the Ultrasonic Velocity Profile - UVP method, have a number of advantages over other conventional measurement methods. They are non-intrusive, applicable to opaque wall or fluid, and capable of obtaining instantaneous velocity profiles along a measurement line in real time. This paper reports on the development of a multiwave Doppler UVP method for the measurement of bubbly two-phase flow in a Taylor-Couette flow configuration. Due to its highly complex nature, two-phase flow still attracts considerable interest in both experimental measurement as well as numerical simulation. In this study the new multiwave Doppler UVP method exploits two basic ultrasonic frequencies 2 MHz and 8 MHz. The 2 MHz frequency is for the measurement of the bubble phase. The 8 MHz frequency is for that of the liquid phase. The signal processing technique is based on the pulse repetition Doppler method. A new phase discrimination method is proposed to eliminate bubble velocity included in the data of the liquid phase measured by the 8 MHz frequency. Measurements of bubbly two-phase Taylor-Couette flow have been demonstrated and discussed.

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“…Presently literature review confirms the advantages of the Doppler method in two-phase flow measurement, e.g. see [12][13][14]. Thus, the Doppler method is exploited in this study.…”

Section: Introductionsupporting

confidence: 66%

Multiwave Ultrasonic Doppler Method for Bubbly Two-Phase Taylor Couette Flow Measurement

Thắng¹

2022

IJHT

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Section: Multiwave Uvp Resultsmentioning

confidence: 99%

“…Recently, an advanced measurement method that uses ultrasound to measure the instantaneous velocity profiles of fluid flow has been developed [3,4]. The method is referred to as the ultrasonic velocity profiling method or the UVP method.…”

Section: Introductionmentioning

confidence: 99%

“…These data are important in both theoretical and experimental analyses of two-phase flow, e.g., for the calculation of the drift velocity which is the velocity difference between the two phases at a point in the flow field. The drift velocity plays an essential role in the Drift-flux CFD model[1,3].Besides instantaneous measured results, average velocity profiles of liquid phase (after phase separation) and bubble phase are shown in Figure5(b). Since, on average, the flow is…”

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confidence: 98%

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Measurement of Bubbly Two-Phase Flow in a Vertical Pipe Using Ultrasonic Velocity Profiler and Digital Optical Imaging

Thang

2023

I2M

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In this study, a novel measurement framework for two-phase air-water bubbly flow has been developed. It consists of ultrasonic and digital optical imaging systems. The measured parameters include instantaneous velocity profiles of the two phases, void fraction and bubble size of the gas phase. The simultaneous velocity profiles of both phases are measured by the state-of-the-art multiwave Ultrasonic Velocity Profile methodmultiwave UVP for short. The void fraction and bubble size are measured by a digital imaging system that exploits high-speed video imaging. Non-intrusive measurement of these instantaneous flow parameters is still a challenge in two-phase flow study. In the present investigation, two ultrasonic signal processing algorithms have been implemented and tested, namely Doppler signal processing and correlation one. Similarly, rigorous digital image processing algorithms implemented in ImageJ tool have been exploited and tested to obtain the average void fraction and bubble size distribution. Furthermore, measurements and analyses have been carried out for various flow conditions. For the particular flow configuration investigated, important experimental data of the two-phase counter-current bubbly flow have been successfully obtained for the first time. The measured data are useful for both experimental and numerical analyses, especially computational fluid dynamics -CFD analyses, of two-phase flows.

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Simultaneous Measurement of Two-Phase Flow Parameters for Drift-Flux Model

Cited by 2 publications

References 16 publications

Multiwave Ultrasonic Doppler Method for Bubbly Two-Phase Taylor Couette Flow Measurement

Multiwave Ultrasonic Doppler Method for Bubbly Two-Phase Taylor Couette Flow Measurement

Measurement of Bubbly Two-Phase Flow in a Vertical Pipe Using Ultrasonic Velocity Profiler and Digital Optical Imaging

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