Particle & Particle Systems Characterization

Cover image for Particle & Particle Systems Characterization

Special Issue: Selected Papers from 5th Int. Conf. on Conveying and Handling of Particulate Solids

November, 2007

Volume 24, Issue 4-5

Pages 251–385

Issue edited by: Haim Kalman, Alan Roberts

  1. Editorial

    1. Top of page
    2. Editorial
    3. Contents
    4. Research Articles
    5. Calendar
    6. Instructions for Authors
  2. Contents

    1. Top of page
    2. Editorial
    3. Contents
    4. Research Articles
    5. Calendar
    6. Instructions for Authors
  3. Research Articles

    1. Top of page
    2. Editorial
    3. Contents
    4. Research Articles
    5. Calendar
    6. Instructions for Authors
    1. A Rotational Tester for the Characterization of Aerated Shear Flow of Powders (pages 259–270)

      Diego Barletta, Giorgio Donsì, Giovanna Ferrari and Massimo Poletto

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200701115

      A modified conventional shear tester for characterization was modified to allow shear flow measurements of aerated cohesive powders is presented. The results obtained at low powder consolidation levels confirm literature findings at higher degrees of consolidation. In particular, aeration does not appear to change the rheological properties of the powder.

    2. Effects of Cyclic Loading and Various Test Conditions in an Uniaxial Tester (pages 271–275)

      Trude O. Nysaeter and Gisle G. Enstad

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601123

      This paper examines the effect of the loading conditions in a uniaxial tester. For this purpose, cyclic loading of the powder was performed varying the stress level and the velocity of the loading piston, as well as the number of cycles. Extensive discussion of the effect of these parameters on the compressive strength is given.

    3. Influence of Powder Material Moisture on the Angle of Wall Friction (pages 276–283)

      Roman Fekete, Marián Peciar and Marián Hanzel

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601122

      This paper addresses the influence of humidity on the angle of wall friction which is an important parameter in powder flow depending on the interaction forces between particles and a surface. The influence of the moisture content, time of consolidation and velocity of movement of the wet powder on the friction force under different vertical forces is shown and discussed in detail.

    4. Investigation of Heat and Moisture Effects in Silos Containing Agricultural Bulk Solids (pages 284–290)

      Jolanta A. Prusiel and Andrzej Lapko

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200701119

      The transport of heat and moisture in a model cylindrical silo is addressed in this paper both, theoretically and experimentally. The experimental studies were conducted on a thin-walled silo model bin filled with mustard seeds using external heating and subsequent natural cooling. Numerical simulations were obtained solving for the coupled heat and moisture transfer in the particulate solid and concrete wall. A comparison of simulations with experimental results shows good agreement.

    5. Non-Axial Stress State in a Model Silo Generated by Eccentric Filling and Internal Inserts (pages 291–295)

      Marek Molenda, Michael D. Montross and Józef Horabik

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601113

      The non-uniformity of the stress distribution in silos can be extremely dangerous. These effects are addressed in this paper quantitatively testing with eccentric filling, eccentric discharge and a non-symmetric flow obstruction on the silo wall. It is shown that this might cause dangerous distributions of local loads although the mechanisms of these phenomena are still poorly understood.

    6. Experimental Investigation of the Flow Pattern and Wall Pressure Distribution in a Silo with a Double-Cone Insert (pages 296–303)

      Michał Wójcik, Johannes Härtl, Jin Y. Ooi, Michael Rotter, Songxiong Ding and Gisle G. Enstad

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601120

      This paper presents recent experimental investigations on the wall pressure distribution and flow pattern observed during the filling and emptying of a full-scale silo, with and without, inserts. The results show that the double-cone insert had a strong influence on the flow and pressures in the silo. A skewed flow often occurred when the insert was installed.

    7. Investigations of Porosity Changes during Granular Silo Flow Using Electrical Capacitance Tomography (ECT) and Particle Image Velocimetry (PIV) (pages 304–312)

      Maciej Niedostatkiewicz and Jacek Tejchman

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601133

      In this manuscript investigations are reported concerning porosity changes in sand during granular flow in model silos using two different non-invasive methods, i.e., Electrical Capacitance Tomography (ECT) and Particle Image Velocimetry (PIV). The experiments in model silos are carried out with different silo wall roughness. Advantages and disadvantages of both experimental methods are outlined.

    8. 2D-Fractal Based Algorithms for Fine and Ultrafine Particulate Solids Systems Characterization (pages 313–321)

      Giuseppe Bonifazi

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200701135

      A newly proposed 2D-fractal approach is applied to characterize the image structure and texture generated by fine and ultrafine particles when impacting on a flat surface. The aim of the work was to develop a simple, reliable and low cost analytical set of procedures with the ability to establishing correlations between particles detected by fractal characteristics and their classical attributes, e.g., i) size class distribution, ii) shape, iii) composition, etc.

    9. The Pattern of Fine Comminution Products (pages 322–327)

      Vincenzo Gente, Vincenzo Giancontieri, Floriana La Marca and Paolo Massacci

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601137

      A new approach is suggested for the purpose of obtaining a proper characteristic size distribution pattern of a particle set. Different methods of modeling the size characterization measured data are examined. In particular, some of the Fourier series sine-coefficient values, relating to the size vector of a particle set, can represent the post-comminution size-distribution pattern.

    10. The Effect of Grinding on the Ground Material Flowability (pages 328–331)

      Evgeny Grant, Haim Kalman and Moshe Averbuh

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601116

      This paper attempts to experimentally evaluate the transformation, decrease and dissipation of the energy consumed during grinding by measuring the physical, chemical and mechanical properties of the ground material. The new experimental results aid the understanding of the behavior of ground material and may help provide better engineering tools for industrial design.

    11. Preliminary Experimental Analysis of a Spiral Jet Mill Performance (pages 332–338)

      Avi Katz and Haim Kalman

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601114

      Jet mills are common devices used for the fine milling of dry particulate materials. Although many parameters affect the performance of such a jet-mill, only a few of them have been systematically investigated to date. A new experimental apparatus was designed and constructed to enable experiments involving as many influencing parameters as possible, e.g. material feeding, mass flow rate, air flow rate, nozzle parameters, etc.

    12. Effect of the Mineral Filler on the Surface Properties of Co-Ground Polymeric Composites (pages 339–344)

      Céline Zapata-Massot and Nadine Le Bolay

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200701136

      This study presents results on the influence of the nature of the filler on the surface properties of polymeric composites produced by co-grinding in a tumbling ball mill. It is shown that grinding generates a large change of the particle surface. In addition, particle agglomeration may be due to electronic deficits at the particle surface.

    13. Bulk Solid Interactions in Belt Conveying Systems: Transition Zone (pages 345–351)

      Dusan D. Ilic, Craig A. Wheeler and Alan W. Roberts

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601132

      In belt conveying systems, bulk solid material immediately prior to discharge moves from a troughed profile to a flat profile. The accurate determination of the discharge profile is essential for effective transfer chute design. Experimental results on the bulk material behavior on the conveyor belt throughout the transition zone are presented and compared to existing theoretical approximations.

    14. Loads on Support Structural Elements Buried in Stockpiles (pages 352–359)

      Alan W. Roberts

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200701134

      The paper presents the theory, combined with design equations, to compute the loads on structural elements, such as conveyor trestle legs or support columns buried in bulk solid storage systems such as stock piles. The theory examines the various loading conditions. The paper is illustrated by reference to A case study involving vertical support columns in a large bulk fertilizer shed is given as well. Experimental results performed on a small scale model are shown to confirm the predicted results.

    15. Simulation-based Knowledge Acquisition for Intelligent Belt Conveyor Monitoring (pages 360–364)

      Yusong Pang and Gabriel Lodewijks

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601117

      The development of knowledge-based systems (KBS) enables accumulated experience and knowledge to be applied to the intelligent monitoring in the field of large-scale belt conveyor systems. The first step of building knowledge bases is referred to the knowledge acquisition (KA) from domain experts and field experiments. This paper introduces a methodology for knowledge-based intelligent belt conveyor monitoring systems. Results of laboratory experiments show the efficiency and the accuracy of the introduced method.

    16. Dynamics of Multiple Drive Belt Conveyor Systems (pages 365–369)

      Ashley J. G. Nuttall and Gabriël Lodewijks

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601118

      This paper investigates the dynamic starting behavior of long multiple drive belt conveyors. By simulating a speed controlled start procedure with a dynamic model, a comparison is made between a single and a multiple drive layout, with no load on the belt. These results show that a link can be established between the dynamic behavior of the belt sections in a multiple drive belt conveyor and a single driven conveyor system.

    17. Design of Self Compensating Soft Loading Hood (pages 370–374)

      William McBride and Dusan Ilic

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601124

      This paper presents a design method for the problem of discharge bias resulting from tonnage fluctuation with soft loading transfer chutes. This is achieved by considering the momentum change inherent in the bulk material stream through the hood section of a soft loading transfer point.

    18. Analysis of Dry Bulk Terminals: Chances for Exploration (pages 375–380)

      Dingena L. Schott and Gabriël Lodewijks

      Version of Record online: 20 NOV 2007 | DOI: 10.1002/ppsc.200601121

      Over the last ten years, global economic developments have had an increasing influence on supply and demand trend in the dry bulk market. The objective of this paper is to point out several issues to be solved in the near future. An results in an overview and analysis of differences and similarities of the facilities for the handling, storage, and processing of the bulk material.

  4. Calendar

    1. Top of page
    2. Editorial
    3. Contents
    4. Research Articles
    5. Calendar
    6. Instructions for Authors
  5. Instructions for Authors

    1. Top of page
    2. Editorial
    3. Contents
    4. Research Articles
    5. Calendar
    6. Instructions for Authors

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