Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-12-01
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| Series: | Applied Sciences |
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| Online Access: | http://www.mdpi.com/2076-3417/9/1/50 |
| _version_ | 1818435494366674944 |
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| author | Wongsakorn Wongsaroj Ari Hamdani Natee Thong-un Hideharu Takahashi Hiroshige Kikura |
| author_facet | Wongsakorn Wongsaroj Ari Hamdani Natee Thong-un Hideharu Takahashi Hiroshige Kikura |
| author_sort | Wongsakorn Wongsaroj |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-14T16:53:47Z |
| format | Article |
| id | doaj.art-e13e6eef962e4f4c8e92a269e587fbd4 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-14T16:53:47Z |
| publishDate | 2018-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-e13e6eef962e4f4c8e92a269e587fbd42022-12-21T22:54:01ZengMDPI AGApplied Sciences2076-34172018-12-01915010.3390/app9010050app9010050Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant FrequencyWongsakorn Wongsaroj0Ari Hamdani1Natee Thong-un2Hideharu Takahashi3Hiroshige Kikura4Department of Mechanical Engineering, Tokyo Institute of Technology, Tokyo 152-8550, JapanLaboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, Tokyo 152-8550, JapanDepartment of Instrumentation and Electronics Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandLaboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, Tokyo 152-8550, JapanLaboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, Tokyo 152-8550, JapanThis 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.http://www.mdpi.com/2076-3417/9/1/50ultrasonic velocity profilerShort-Time Fourier Transformtwo-phase flowbubbly |
| spellingShingle | Wongsakorn Wongsaroj Ari Hamdani Natee Thong-un Hideharu Takahashi Hiroshige Kikura Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency Applied Sciences ultrasonic velocity profiler Short-Time Fourier Transform two-phase flow bubbly |
| title | Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency |
| title_full | Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency |
| title_fullStr | Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency |
| title_full_unstemmed | Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency |
| title_short | Extended Short-Time Fourier Transform for Ultrasonic Velocity Profiler on Two-Phase Bubbly Flow Using a Single Resonant Frequency |
| title_sort | extended short time fourier transform for ultrasonic velocity profiler on two phase bubbly flow using a single resonant frequency |
| topic | ultrasonic velocity profiler Short-Time Fourier Transform two-phase flow bubbly |
| url | http://www.mdpi.com/2076-3417/9/1/50 |
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