SCI和EI收录∣中国化工学会会刊

›› 2012, Vol. 20 ›› Issue (2): 337-345.

• SELECTED PAPERS FROM THE 6TH WORLD CONGRESS ON INDUSTRIAL PROCESS TOMOGRA-PHY (WCIPT6) • Previous Articles     Next Articles

ECT Image Analysis Methods for Shear Zone Measurements during Silo Discharging Process

Krzysztof Grudzien1, Zbigniew Chaniecki1, Andrzej Romanowski1, Maciej Niedostatkiewicz2, Dominik Sankowski1   

  1. 1. Computer Engineering Department, Technical University of Lodz, Stefanowskiego 18/22 str, 90-924 Lodz, Poland;
    2. Department of Fundamentals of Building and Material Engineering, Gdansk University of Technology, Gdansk, Poland
  • Received:2011-12-07 Revised:2012-01-09 Online:2012-05-02 Published:2012-04-28
  • Supported by:
    Supported by the Polish Ministry of Science and Higher Education in 2009-2012 as a research project (3687/B/T02/2009/37)

ECT Image Analysis Methods for Shear Zone Measurements during Silo Discharging Process

Krzysztof Grudzien1, Zbigniew Chaniecki1, Andrzej Romanowski1, Maciej Niedostatkiewicz2, Dominik Sankowski1   

  1. 1. Computer Engineering Department, Technical University of Lodz, Stefanowskiego 18/22 str, 90-924 Lodz, Poland;
    2. Department of Fundamentals of Building and Material Engineering, Gdansk University of Technology, Gdansk, Poland
  • 通讯作者: Andrzej Romanowski
  • 基金资助:
    Supported by the Polish Ministry of Science and Higher Education in 2009-2012 as a research project (3687/B/T02/2009/37)

Abstract: The paper covers the electrical capacitance tomography (ECT) data analysis on shear zones formed during silo discharging process.This is due to the ECT aptitude for detection of slight changes of material concentration.On the basis of ECT visualisations,wall-adjacent shear zone profiles are analysed for different wall roughness parameters.The analysis on changes of material concentration,based on ECT images,enables the calculation for the characteristic parameters of shear zones-size and material concentration inside the shear zone in a dynamic process of silo discharging.In order to verify the methodology a series of experiments on gravitational flow of bulk solids under various conditions were conducted with different initial granular material packing densities and silo wall roughness.The investigation shows that the increase in container wall roughness is an effective method for reducing the dynamic effects during the material discharging,since these effects are resulted from the resonance between hopper construction and trembling material.Such effects will damage industrial equipment in practical applications and need further investigation.

Key words: electrical capacitance tomography, silo flow, shear zone

摘要: The paper covers the electrical capacitance tomography (ECT) data analysis on shear zones formed during silo discharging process.This is due to the ECT aptitude for detection of slight changes of material concentration.On the basis of ECT visualisations,wall-adjacent shear zone profiles are analysed for different wall roughness parameters.The analysis on changes of material concentration,based on ECT images,enables the calculation for the characteristic parameters of shear zones-size and material concentration inside the shear zone in a dynamic process of silo discharging.In order to verify the methodology a series of experiments on gravitational flow of bulk solids under various conditions were conducted with different initial granular material packing densities and silo wall roughness.The investigation shows that the increase in container wall roughness is an effective method for reducing the dynamic effects during the material discharging,since these effects are resulted from the resonance between hopper construction and trembling material.Such effects will damage industrial equipment in practical applications and need further investigation.

关键词: electrical capacitance tomography, silo flow, shear zone