Abstract
The present paper describes a measurement technique for phase-separated velocity profile measurements in the two-phase bubbly flow. The Ultrasonic Velocity Profiler (UVP) method which is nonintrusive measurement, is applied to obtain an instantaneous velocity profile of liquid and bubble separately by using only one resonant frequency. To achieve this target, developed algorithm, which can decompose frequency component of the Doppler signal affected by liquid and bubble, is applied in the UVP system to obtain and separate instantaneous velocity profile of both phases. For confirming the applicability of modified measurement system, the developed UVP was used for the measurement of the velocity profile in bubbly flow on vertical pipe flow apparatus, the measurement accuracy was validated by UVP Original and Particle Image Velocimetry (PIV) method. Finally, the UVP was applied to experiment for observing velocity distribution of both phases in a bubble column.
Highlights
Two-phase bubbly flow is a fundamental phenomenon which occurs in many industrial processes such as thermal power plant, chemical processes, nuclear reactors, and so on
A measurement system consisted of the Ultrasonic Velocity Profiler (UVP) and a Particle Image Velocimetry (PIV) system
The velocity distributions measured by UVP measurement with Doppler frequency decomposition technique (DFD) technique (UVP-DFD), UVP Original, and PIV, had almost agreement except near the vicinity of the wall
Summary
Two-phase bubbly flow is a fundamental phenomenon which occurs in many industrial processes such as thermal power plant, chemical processes, nuclear reactors, and so on. Many intrusive techniques have been employed to investigate velocity distribution in bubbly flow such as conductive probe [1]. Murakawa et al [6] employed multi-waves TDX transducer and time domain cross-correlation method (UTDC) to measure and separate liquid and bubble velocity profile with pattern recognition of ultrasonic echo amplitude. This technique could obtain the instantaneous velocity of both phases, more devices were required owing to two resonant frequencies were needed. This work proposes a developed technique of UVP system for obtaining instantaneous velocity profile of bubbly flow using single resonant frequency. The UVP is applied to experiment in a bubble column for observing velocity distribution of both phases
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