Particle & Particle Systems Characterization

Cover image for Particle & Particle Systems Characterization

Special Issue: Special Issue of Honour of Professor Brian Scarlett (Part 2).

August, 2007

Volume 24, Issue 2

Pages 75–147

  1. Contents

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

    1. Top of page
    2. Contents
    3. Research Articles
    4. Calendar
    5. Instructions for Authors
    1. The Electrostatic Force Between a Partially Charged Dielectric Particle and a Conducting Plane (pages 79–84)

      Tatsushi Matsuyama and Hideo Yamamoto

      Version of Record online: 22 AUG 2007 | DOI: 10.1002/ppsc.200601045

      Using the re-expansion technique, the interaction between a conducting plane and a partially charged dielectric particle is studied for an axisymmetric case including the effects of the higher order polarization. The partial charge on a particle surface is seen to redistribute, apparently due to the polarization which occurs even though the particle is an insulator. These results can be used for estimation of contact electrification of polymer particles.

    2. Bioaerosol Analysis by Single Particle Mass Spectrometry (pages 85–90)

      Ineke Kleefsman, Michael A. Stowers, Peter J. T. Verheijen, Arjan L. van Wuijckhuijse, Charles E. Kientz and Jan C. M. Marijnissen

      Version of Record online: 21 JUN 2007 | DOI: 10.1002/ppsc.200601049

      The performance and improvements of an aerosol mass spectrometer for the real time analysis of bioaerosol particles is described. Biological particles are pre-selected by fluorescence detection and are then subject to mass spectrometry. The interference with soot particles is found to be minor. Overall, the capability of the method is demonstrated and discussed in detail.

    3. Characterization of Reference Particles of Transparent Glass by Laser Diffraction Method (pages 91–96)

      Yasushige Mori, Hideto Yoshida and Hiroaki Masuda

      Version of Record online: 21 JUN 2007 | DOI: 10.1002/ppsc.200601048

      This paper presents the results of a round robin test to measure particle size distributions of two samples with glass beads of 1–10 μm and 10–100 μm, respectively. Furthermore these results are compared with electrical sensing zone and SEM analysis. Practical aspects of sample preparation are discussed as well as a comparison of results from the round robin test and the reference methods, respectively.

    4. From Particle Collective Characteristics to Cake Permeability: the Use of the Pore-Particle Shape Factor (pages 97–100)

      José Angel Sorrentino

      Version of Record online: 21 JUN 2007 | DOI: 10.1002/ppsc.200601047

      The resulting porosity of filter cakes as depending on the particle size distribution and the cake formation mechanism is investigated thoroughly in this paper. Furthermore, a shape factor for application in the Karman-Kozeny equation is used to get consistent results of cake flow permeability. Besides, a pore-particle shape factor is used to include the effect of non-spherical particles.

    5. The Influence of Particle Size Distribution on the Performance of Ceramic Particulate Suspensions (pages 101–107)

      Maria da Graça Rasteiro and Albano Jorge

      Version of Record online: 21 JUN 2007 | DOI: 10.1002/ppsc.200601042

      This study focuses attention on the influence of particle size distribution on three important properties of ceramic glaze suspensions: rheological behavior, opacity and reflectance characteristics and tendency to dissolve. Results are presented for two formulations and at least three different particle sizes each. The complex interaction of rheology, particle size and particle interactions as influenced by cationic content as a result of frit dissolution is shown and discussed thoroughly.

    6. Why does the World Need a True Triaxial Tester? (pages 108–112)

      Richard Janssen and Marco Verwijs

      Version of Record online: 22 AUG 2007 | DOI: 10.1002/ppsc.200601050

      Recent developments in discrete element modeling and new experimental techniques to understand particle interactions are particularly helpful in the understanding of powder flow behavior. However, the capability for good experimental testing is also crucial. A true triaxial tester will be very important in enabling validation of hypotheses and challenging the outcome of DEM simulations. An important research topic for such a device would be anisotropy and the effect of structure.

    7. Powder Flow: The 4M Business and Systems Approach (pages 113–116)

      Marco Verwijs

      Version of Record online: 22 AUG 2007 | DOI: 10.1002/ppsc.200601051

      Professor Brian Scarlett initiated and promoted the 4M business – making, measuring, modeling, and manipulating. Measuring and modeling are tools to design and control products and processes, which one wants to make and manipulate. In this paper, the 4M business and systems approach as taught by Professor Scarlett are explained and their applicability to powder flow is discussed. It is shown that the four M's are largely interconnected and are more useful when used in conjunction with one another.

    8. Characterisation of Flowability of Loosely Compacted Cohesive Powders by Indentation (pages 117–123)

      Ali Hassanpour and Mojtaba Ghadiri

      Version of Record online: 22 AUG 2007 | DOI: 10.1002/ppsc.200601111

      Investigations on the flowability of bulk powders using indentation and unconfined direct compression testing of powders compacted at low pressure levels are reported. These tests were performed on different samples (lactose, magnesium carbonate and conditioned glass spheres). The results show that in some cases it is possible to deduce the powder flow behavior from such measurements. Furthermore, Distinct Element Method is applied to simulate the particle bulk behavior and a good qualitative agreement is achieved.

    9. Air Current Segregation of Alumina Powder (pages 124–135)

      Stefan Zigan, Rex B. Thorpe, Ugur Tuzun and Gisle G. Enstad

      Version of Record online: 22 AUG 2007 | DOI: 10.1002/ppsc.200601077

      This paper outlines the industrial problem of air current segregation in alumina storage silos. Experiments were carried out in a two-dimensional apparatus as well as in a cylindrical silo. It is found that an increase of the powder feeding rate or the air extraction rate reduces air current segregation in the experimental equipment. The aim of the experiments was to find all significant parameters for the process. A dimensional analysis together with some simplifications was used to test scale-up in a water model and an air model.

    10. Influence of Wetting Parameters on Particle Growth in Fluidized-Bed Coating and Agglomeration Processes (pages 136–143)

      Khashayar Saleh and Pierre Guigon

      Version of Record online: 22 AUG 2007 | DOI: 10.1002/ppsc.200601044

      This work presents the results of an experimental study concerning the fluidized bed coating of spherical solid particles by injection of an aqueous solution of lactose. The objective was to study the influence of the wetting parameters (i.e. surface tension and wetting contact angle) on the coating efficiency and the growth rate. The effect of controlled variation of these parameters on surface coating is discussed in detail. Furthermore, the variations in the growth rate can be related to interparticulate forces resulting from liquid bridges.

  3. Calendar

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

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