Automatyka
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ISSN 1429-3447
e-ISSN: 2353-0952
Issue Date
2010
Volume
T. 14
Number
Nr 3/2
Description
Journal Volume
Automatyka
T. 14 (2010)
Projects
Pages
Articles
Electrostatic field simulations in the analysis and design of electrical capacitance tomography sensors
(Wydawnictwa AGH, 2010) Brandisky, Kostadin; Romanowski, Andrzej; Grudzień, Krzysztof; Sankowski, Dominik
Electrical Capacitance Tomography (ECT) is used in many industrial processes for visualizations and determination of flow parameters. The analysis of the electrostatic field in ECT sensors and the computation of capacitances and sensitivities, are of key importance in designing better sensors. Especially analysis 3D measurements sensor space can give information in order to better interpret the capacitance changes during monitoring industrial processes using ECT system. In this paper the electrostatic field analysis of ECT sensors is considered and the opportunities it gives for the sensor design are outlined. The simulation results are compared to real measurements value obtain from 12-electrodes ECT system.
Application of electrical capacitance tomography system for non-invasive phases distribution detection in gas-liquid mixtures
(Wydawnictwa AGH, 2010) Fidos, Henryk; Wajman, Radosław; Banasiak, Robert; Sowiński, Jarosław; Sankowski, Dominik
The aim of this paper is to show the capabilities of the Electrical Capacitance Tomography (ECT) system as a technique for real-time three-dimensional examination of the parameters of the two phase flow structure. The main advantages of the ECT method over other techniques is a fact that this is a non-invasive, non-intrusive and, in addition, a very fast technique for investigation of the distribution of any dielectric materials. The ECT image provides the information about the flow fraction profile. Due to the high speed of ECT measurements it is possible to find out the velocity profile and mass flow rate.
Analysis of funnel flow in rectangular silo based on ECT data
(Wydawnictwa AGH, 2010) Grudzień, Krzysztof; Maire, Eric; Adrien, Jerome; Sankowski, Dominik
About 60% of solid state industrial products appear, at some stage of production, as powders or grains. Many of them are stored in containers, majority in silos. The most popular shape type of silo is cylindrical, but very often rectangular silos are used, mainly in mining or construction industry. One of the characteristic points of the bulk solids flow are dynamic volume changes during processes of receptacle unloading. The paper presents results of Electrical Capacitance Tomography application to monitoring sand concentration distribution inside model of rectangular silo. The silo construction causes a funnel flow of sand after opening the outlet. ECT allows in non-invasive way to track the changes of funnel size and sand concentration in funnel zone. Paper presents post-processing methods application for reconstructed image analysis in order to estimate the main parameters of funnel. Additionally the results of experiments allow to investigate the influence of wall roughness and initial sand density on the silo process discharging. The results are compared with data received from X-ray tomography system in order to determine the accuracy of ECT.
Application of particle image velocimetry method for monitoring the volume changes during silo flow on the basis of X-radiographs
(Wydawnictwa AGH, 2010) Grudzień, Krzysztof; Niedostatkiewicz, Maciej; Babout, Laurent; Adrien, Jerome
Particle Image Velocimetry (PIV) technique, as an optical method of flow visualisation, is based on the numerical analysis of successive pairs of digital photographs (CCD camera). It is typically used to obtain the time dependent field of velocity distributions of flowing material. In case of silo flow PIV methods allows to analyse of the volumetric strain in sand during silo discharging process. Monitoring of granular materials volumetric strain in silos is crucial for construction site safety. Authors are presenting application of PIV method for analysis of a bulk solid deformation during silo emptying to images obtained using X-ray, continuous exposure based radiographs. Analysis of radiograph images enables to gather the additional information, comparing to classical input data for PIV-digital photographs, about the volume changes, especially in the core of flow and above the outlet. Results are presented as volumetric strain changes for selected time points of the silo emptying process.
Applying parallel and distributed computing for image reconstruction in 3D electrical capacitance tomography
(Wydawnictwa AGH, 2010) Kapusta, Paweł; Majchrowicz, Michał; Banasiak, Robert
Main goal of this article is to describe the set of solutions based on the OpenCL and Xgrid technologies that would accelerate image reconstruction calculation process in 3D Electrical Capacitance Tomography. The authors propose a new idea of performing the image reconstruction process by combining graphic cards and parallel programming techniques using OpenCL technology with distributed computing based on Xgrid clusters.