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Browsing by Subject "gravitational flow"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    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.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Diagnostyka przepływu materiału sypkiego podczas grawitacyjnego opróżniania silosu smukłego
    (Wydawnictwa AGH, 2008) Grudzień, Krzysztof; Niedostatkiewicz, Maciej; Chaniecki, Zbigniew
    The paper presents the results of the measurements of the solid concentration changes during gravitational emptying the cylindrical silo. The measurements were taken by applied the non-invasive diagnostic method - Electrical Capacitance Tomography (ECT). The experiments conducted for different initially density of granular material with smooth and rough silo walls. Increasing the wall roughness is a one of the most effective way to reduce the dynamics effects, arousing as the result of the resonance between the trembling of granular material and the silo construction. In order to conduct the detailed analysis of shear zone in the wall profile was applied ECT methodology to visualize the changes of concentration distribution in time and tomography image processing to calculate the characteristic parameters of shear zone.