Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column

Liquid/gas two-phase flow widely exists in many applications including chemical and petroleum industries. Measurement of this two-phase flow is an essential parameter for these applications where accurate flow measurement is required. Two-phase flow, a phenomenon of critical importance to oil and...

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Main Author: Nor Muzakkir, Nor Ayob
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2014
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Online Access:http://dspace.unimap.edu.my:80/dspace/handle/123456789/31920
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spelling my.unimap-319202014-02-13T14:31:03Z Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column Nor Muzakkir, Nor Ayob Ultrasonic Transmission Tomography Liquid and gas flow Flow measurement system Two-phase flowmeter Liquid/gas two-phase flow widely exists in many applications including chemical and petroleum industries. Measurement of this two-phase flow is an essential parameter for these applications where accurate flow measurement is required. Two-phase flow, a phenomenon of critical importance to oil and gas sector where compared with singlephase flow, its flow characteristic is much more complex. Thus, the improvement of the instrumentation and measurement technology for the two-phase flow such as the development of two-phase flowmeters will have a growing demand since it will bring significant benefits to many industries. Based on the advantage of tomographic imaging technique, non-invasive ultrasonic sensing technique is realized by using electronic measurement circuits for transmitting and receiving the analog signals, data acquisition system for transferring the data to the PC and most importantly the suitable image reconstruction algorithm for providing visual access to the two-phase liquid/gas flow and estimating the component distribution for real-time measurement. The important characteristic for sensor selection is noted and balanced between high operating frequency for increased spatial sensitivity and the cross-sectional area of the vertical column to avoid undetected measurement signal caused by complete attenuation. The enhancement of liquid and gas component distribution imaging over the common Linear Back Projection (LBP) algorithm has been successful by implementing the new Eminent Pixel Reconstruction (EPR) algorithm. Simulative study on liquid/gas two-phase velocity measurement for dual-plane ultrasonic tomography system also has been made. Two different methods based on the use of cross-correlation technique have shown the usability of the technique for estimating the flow velocity. The image reconstructions quality of the two-phase flow is seen to have a significant increase by combining the EPR algorithm with Median Filtering technique that eliminated pixel values which are unrepresentative of their surroundings. Another advantage of such combination is the smoothen effect on the reconstructed images, resulting in better visualization of the twophase liquid and components because the outcome have approximating shape and size if compared with the actual flow condition. Linear regression method are also introduced for configuring the appropriate threshold values for imaging different size of gas component inside the investigated column especially on the successful detection of small gas bubbles. The results obtained can be useful for the online monitoring of liquid/gas flow in many industrial processes such as chemical mixing process, fluid transportation or process monitoring. 2014-02-13T14:31:03Z 2014-02-13T14:31:03Z 2011 Thesis http://dspace.unimap.edu.my:80/dspace/handle/123456789/31920 en Universiti Malaysia Perlis (UniMAP) School of Mechatronic Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Ultrasonic Transmission Tomography
Liquid and gas flow
Flow measurement system
Two-phase flowmeter
spellingShingle Ultrasonic Transmission Tomography
Liquid and gas flow
Flow measurement system
Two-phase flowmeter
Nor Muzakkir, Nor Ayob
Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column
description Liquid/gas two-phase flow widely exists in many applications including chemical and petroleum industries. Measurement of this two-phase flow is an essential parameter for these applications where accurate flow measurement is required. Two-phase flow, a phenomenon of critical importance to oil and gas sector where compared with singlephase flow, its flow characteristic is much more complex. Thus, the improvement of the instrumentation and measurement technology for the two-phase flow such as the development of two-phase flowmeters will have a growing demand since it will bring significant benefits to many industries. Based on the advantage of tomographic imaging technique, non-invasive ultrasonic sensing technique is realized by using electronic measurement circuits for transmitting and receiving the analog signals, data acquisition system for transferring the data to the PC and most importantly the suitable image reconstruction algorithm for providing visual access to the two-phase liquid/gas flow and estimating the component distribution for real-time measurement. The important characteristic for sensor selection is noted and balanced between high operating frequency for increased spatial sensitivity and the cross-sectional area of the vertical column to avoid undetected measurement signal caused by complete attenuation. The enhancement of liquid and gas component distribution imaging over the common Linear Back Projection (LBP) algorithm has been successful by implementing the new Eminent Pixel Reconstruction (EPR) algorithm. Simulative study on liquid/gas two-phase velocity measurement for dual-plane ultrasonic tomography system also has been made. Two different methods based on the use of cross-correlation technique have shown the usability of the technique for estimating the flow velocity. The image reconstructions quality of the two-phase flow is seen to have a significant increase by combining the EPR algorithm with Median Filtering technique that eliminated pixel values which are unrepresentative of their surroundings. Another advantage of such combination is the smoothen effect on the reconstructed images, resulting in better visualization of the twophase liquid and components because the outcome have approximating shape and size if compared with the actual flow condition. Linear regression method are also introduced for configuring the appropriate threshold values for imaging different size of gas component inside the investigated column especially on the successful detection of small gas bubbles. The results obtained can be useful for the online monitoring of liquid/gas flow in many industrial processes such as chemical mixing process, fluid transportation or process monitoring.
format Thesis
author Nor Muzakkir, Nor Ayob
author_facet Nor Muzakkir, Nor Ayob
author_sort Nor Muzakkir, Nor Ayob
title Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column
title_short Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column
title_full Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column
title_fullStr Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column
title_full_unstemmed Development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column
title_sort development of ultrasonic tomography system for liquid/gas flow measurement in a vertical column
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2014
url http://dspace.unimap.edu.my:80/dspace/handle/123456789/31920
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score 13.222552