scholarly journals De-aliasing of ultrasonic velocity profiler on bubbly flow beyond the Nyquist limit

2020 ◽  
Vol 41 (6) ◽  
pp. 917-920
Author(s):  
Wongsakorn Wongsaroj ◽  
Natee Thong-un ◽  
Naruki Shoji ◽  
Hideharu Takahashi ◽  
Hiroshige Kikura
Keyword(s):  
Ultrasonic Velocity ◽  
Bubbly Flow ◽  
Nyquist Limit

Application of Short Time Fourier Transform in Ultrasonic Velocity Profiler on Bubbly Flow

2018 ◽  
Author(s):  
Wongsakom Wongsaroj ◽  
Ari Hamdani ◽  
Natee Thong-un ◽  
Hideharu Takahashi ◽  
Weerachon Treenuson ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Ultrasonic Velocity ◽  
Bubbly Flow ◽  
Short Time Fourier Transform ◽  
Short Time

scholarly journals Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency

2018 ◽  
Vol 9 (1) ◽  
pp. 50 ◽  
Author(s):  
Wongsakorn Wongsaroj ◽  
Ari Hamdani ◽  
Natee Thong-un ◽  
Hideharu Takahashi ◽  
Hiroshige Kikura
Keyword(s):  
Fourier Transform ◽  
Velocity Profile ◽  
Resonant Frequency ◽  
Ultrasonic Velocity ◽  
Bubbly Flow ◽  
Bubble Velocity ◽  
Invasive Technique ◽  
Short Time Fourier Transform ◽  
Two Phase ◽  
Short Time

This study introduces a measurement technique for simultaneous phase-separated velocity in two-phase bubbly flow. The non-invasive technique, based on an Ultrasonic Velocity Profiler (UVP), is used in order to obtain an instantaneous, separate velocity profile for both liquid and bubble. The aim of this paper is to measure each phase velocity at the same time and position it using only a single resonant frequency. To achieve this aim, extended signal processing of the Short-Time Fourier Transform (STFT) is proposed, combining with amplitude classification to analyze Doppler signal influenced from the bubbly flow. The use of developed algorithms allows the instantaneous separation of liquid and bubble velocity profiles. In this work, the developed technique is used to measure the velocity profile of bubbly flow in the vertical pipe, demonstrating the classification of liquid and bubble velocity. To confirm the accuracy of each velocity profile phase, the Particle Image Velocimetry (PIV) method is used for comparison. The results clarify that the proposed method is in good agreement with the PIV measurement. Finally, the effect of void fraction against velocity measurement of both phases was demonstrated.

scholarly journals Measurement System of Bubbly Flow Using Ultrasonic Velocity Profile Monitor and Video Data Processing Unit, (III)

1998 ◽  
Vol 35 (5) ◽  
pp. 335-343 ◽  
Author(s):  
Shirong ZHOU ◽  
Yumiko SUZUKI ◽  
Masanori ARITOMI ◽  
Mitsuo MATSUZAKI ◽  
Yasushi TAKEDA ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Data Processing ◽  
Ultrasonic Velocity ◽  
Measurement System ◽  
Bubbly Flow ◽  
Video Data ◽  
Processing Unit ◽  
Data Processing Unit

Measurement System of Bubbly Flow Using Ultrasonic Velocity Profile Monitor and Video Data Processing Unit

1996 ◽  
Vol 33 (12) ◽  
pp. 915-923 ◽  
Author(s):  
Masanori ARITOMI ◽  
Shirong ZHOU ◽  
Makoto NAKAJIMA ◽  
Yasushi TAKEDA ◽  
Michitsugu MORI ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Data Processing ◽  
Ultrasonic Velocity ◽  
Measurement System ◽  
Bubbly Flow ◽  
Video Data ◽  
Processing Unit ◽  
Data Processing Unit

EXPERIMENTAL DATA SET NO. 24: PHASE DISTRIBUTION IN BUBBLY FLOW

1992 ◽  
Vol 6 (1-4) ◽  
pp. 257-301 ◽  
Author(s):  
Akimi Serizawa ◽  
Isao Kataoka ◽  
Itaru Michiyoshi
Keyword(s):  
Experimental Data ◽  
Phase Distribution ◽  
Bubbly Flow ◽  
Data Set

Local characteristics of the upward bubbly flow in an annular channel

2011 ◽  
Vol 18 (1) ◽  
pp. 37-41 ◽  
Author(s):  
O. N. Kashinsky ◽  
A. S. Kurdyumov ◽  
P. D. Lobanov
Keyword(s):  
Bubbly Flow ◽  
Annular Channel ◽  
Local Characteristics
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