Flow regime identification and optimum interfacial area control of bubble columns using electrical impedance imaging

Miao Wang, Xiaodong Jia, M. Bennett, Richard A Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

This paper reports a preliminary study where electrical resistance tomography (ERT) is used to measure and control a bubble column. Several methods for identifying flow regimes (e.g. bubbly and churn flows) in the bubble column have been tested, from which two control strategies have been developed and compared. The first strategy relies on the mean pixel values of ‘normal’ ERT images. The second strategy is based on the fluctuations of the mean pixel values of ‘dynamic’ ERT images. The aim of the control is to automatically reach and maintain the flow condition deemed to correspond to the maximum interfacial area, since such a condition is desirable for many chemical reactions and mass transfer operations using bubble columns. In the cases where the background or reference conductivity changes during a single operation (e.g. due to changes in temperature and/or chemical composition), the control strategy based on fluctuations can be shown to be more robust than the other. The Golden search optimisation method has been adopted to determine the set point for PID control. A preliminary study of using electrical resistance tomographic imaging for bubble column measurement and control has been conducted. Serveal methods for identifying flow regimes (e.g. bubbly and churn-turbulent flows) have been developed. The golden section search optimisation method is used to search for the flow rate corresponding to the maximum estimated interfacial area and to determine the set-point for PID control. A simple, flow-parameter control strategy, based on bubble fluctuation as represented by derivatives of dynamic imaging, is reported.

Original languageEnglish
Title of host publication2nd World Congress on Industrial Process Tomography
PublisherInternational Society for Industrial Process Tomography
Pages726-734
Number of pages9
ISBN (Print)9780853163183
Publication statusPublished - 2014
Event2nd World Congress on Industrial Process Tomography - Hannover, Germany
Duration: 29 Aug 200131 Aug 2001

Conference

Conference2nd World Congress on Industrial Process Tomography
CountryGermany
CityHannover
Period29/08/0131/08/01

Keywords

  • Bubble column
  • Control
  • Electrical resistance tomography
  • Flow regime

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Computational Mechanics
  • Computer Vision and Pattern Recognition

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  • Cite this

    Wang, M., Jia, X., Bennett, M., & Williams, R. A. (2014). Flow regime identification and optimum interfacial area control of bubble columns using electrical impedance imaging. In 2nd World Congress on Industrial Process Tomography (pp. 726-734). International Society for Industrial Process Tomography.