Particle & Particle Systems Characterization

Cover image for Particle & Particle Systems Characterization

January, 2006

Volume 22, Issue 4

Pages 231–288

    1. Mean Particle Diameters. Part V: Theoretical Derivation of the Proper Type of Mean Particle Diameter describing a Product or Process Property (pages 233–245)

      Maarten Alderliesten

      Version of Record online: 20 JAN 2006 | DOI: 10.1002/ppsc.200500987

      Mean particle diameters may be used to model the properties of disperse products. A number of examples from the areas of evaporation, heat transfer, and turbulent two-phase flow are used to illustrate a theoretical approach to derive an appropriate type of mean diameter for each application.

    2. Application of a Bayesian Approach to the Tomographic Analysis of Hopper Flow (pages 246–253)

      Krzysztof Grudzien, Andrzej Romanowski and Richard A. Williams

      Version of Record online: 20 JAN 2006 | DOI: 10.1002/ppsc.200500951

      A new approach to the analysis of data on powder flow from electrical tomography is presented. The feasibility of this method is shown for a hopper discharge. It is demonstrated that the more robust identification of the complex system responses offers significant advantages in analysis and control of industrial powder processes.

    3. Analysis of the Initial Slope of the Small-Angle Scattering Correlation Function of a Particle (pages 254–260)

      Wilfried Gille, Alain Mazzolo and Benoit Roesslinger

      Version of Record online: 20 JAN 2006 | DOI: 10.1002/ppsc.200500883

      In this paper it is demonstrated that the mean cord length of a particle is given by the initial slope of the small-angle scattering correlation function. This involves also non-convex particles, especially the case of particles with hollow parts. This is demonstrated for some test cases of hollow spheres, touching spheres and hollow cylinders.

    4. Milling of Organic Solids in a Jet Mill. Part 2: Checking the Validity of the Predicted Rate of Breakage Function (pages 261–267)

      Onno de Vegt, Herman Vromans, Fried Faassen and Kees van der Voort Maarschalk

      Version of Record online: 20 JAN 2006 | DOI: 10.1002/ppsc.200500985

      The optimization of milling conditions is very difficult in case the amount of material is limited. This manuscript verifies a previously presented method to predict the appropriate milling conditions using five different model compounds. It is shown that the model can give a reasonable prediction of the milling process with good agreement in the coarse particle range.

    5. Identification of Metal Contaminants on FCC Catalyst (pages 268–275)

      Josh M. Whitcombe, Igor E. Agranovski and Roger D. Braddock

      Version of Record online: 20 JAN 2006 | DOI: 10.1002/ppsc.200500972

      Deactivation of FCC catalyst by deposition of metal contaminants is a major concern in refining industry. Samples taken from a refinery were analyzed in order to map cross-sectional composition of fresh and used catalyst. It is shown that mild attrition may restore the original chemical activity and will therefore help to improve FCC catalyst usage.

    6. Characterization of TiO2 Smoke Prepared Using Gas-Phase Hydrolysis of TiCl4 (pages 276–281)

      Lua'y Zeatoun and Donald Feke

      Version of Record online: 20 JAN 2006 | DOI: 10.1002/ppsc.200500947

      The formation of submicron TiO2 smoke in a low-pressure hydrolysis reaction in a simple reactor configuration is described. The crystallinity, size and structure of the aggregates is described depending on reaction conditions. It is shown that structures may vary from almost spherical particles to highly structured, compact or fractal aggregates.