Description of the silo flow and bulk solid pulsation detection using ECT

Abstract This paper covers the results of tests with the slender cylindrical silo emptied both gravitationally and in a controlled manner. The measurement technique chosen as an examination tool is the Electrical Capacitance Tomography (ECT). The major aim of this paper is to demonstrate the measurement capabilities of ECT system dedicated to detect oscillations in non-cohesive sand during silo flow. The actual experimental measurements were preceded by analysis of signal noise for static and dynamic tests. The influence of the initial density, wall roughness, elevation and velocity on the emptying process and vibrations is examined, as well. Results are presented in the form of continuous, concentration vs. time, graphs. Graphs are plotted on the basis of the raw measurement data and values of chosen reconstructed image pixels.

[1]  Jacek Tejchman,et al.  Modeling of shear localization during confined granular flow in silos within non-local hypoplasticity , 2009 .

[2]  Pankaj,et al.  Investigation of Silo Honking: Slip-Stick Excitation and Wall Vibration , 2005 .

[3]  P. Brzeski,et al.  Multichannel capacitance tomograph for dynamic process imaging , 2003 .

[4]  Todd Pugsley,et al.  The influence of permittivity models on phantom images obtained from electrical capacitance tomography , 2002 .

[5]  Wim De Waele,et al.  Optical measurement of target displacement and velocity in bird strike simulation experiments , 2003 .

[6]  Krzysztof Grudzień,et al.  Determination of bulk solid concentration changes during granular flow in a model silo with ECT sensors , 2009 .

[7]  G. Enstad,et al.  ON THE THEORY OF ARCHING IN MASS FLOW HOPPERS , 1975 .

[8]  Hugh McCann,et al.  Process Imaging For Automatic Control , 2005 .

[9]  Christopher M. Wensrich,et al.  Experimental behaviour of quaking in tall silos , 2002 .

[10]  D. Schaeffer,et al.  Two phase flows and waves , 1990 .

[11]  Dominik Sankowski,et al.  Application of Electrical Capacitance Tomography for Bulk Solids Flow Analysis in Silos , 2006 .

[12]  Tomasz Dyakowski,et al.  Application of capacitance tomography to gas-solid flows , 1997 .

[13]  K. K. Rao,et al.  Silo music: Sound emission during the flow of granular materials through tubes , 2006 .

[14]  Lihui Peng,et al.  Image reconstruction algorithms for electrical capacitance tomography , 2003 .

[15]  Radosław Wajman,et al.  Electrical capacitance tomography: image reconstruction along electrical field lines , 2001 .

[16]  Andrzej Romanowski,et al.  Analysis and Interpretation of Hopper Flow Behaviour Using Electrical Capacitance Tomography , 2006 .

[17]  Krzysztof Wilde,et al.  Silo music — Mechanism of dynamic flow and structure interaction , 2008 .

[18]  Brian S. Hoyle,et al.  Electrical capacitance tomography for flow imaging: system model for development of image reconstruction algorithms and design of primary sensors , 1992 .

[19]  M. S Beck,et al.  Imaging Industrial Flows: Applications of Electrical Process Tomography , 1995 .

[20]  R. Behringer,et al.  Pattern Formation and Time-Dependence in Flowing Sand , 1990 .

[21]  Jonathan Seville,et al.  Processing of Particulate Solids , 1997 .