Topics in Particle and Dispersion Science

Very brief abstracts (VBAs)

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• In: PSD measurement: Image analysis
   
  An ImageJ user-coded image analysis Java plugin measured Feret diameters of irregular shaped particles (ground biomass) and grouped them according to their distinct lengths for particle size distribution (PSD) analysis (Igathinathane C et al 2009a). Each of these all-distinct particle length groups was considered a virtual sieve. Over 419 such sieves were used to evaluate the "exact" PSDs of ground biomass samples. More than 50 virtual sieves with opening (mesh) sizes equally spaced in the overall particle size range of ~0.1 to 50 mm were required to match statistically (at P ≤ 0.05) the exact cumulative undersize PSD and several other parameters (e.g. uniformity index, sieve range variation coefficient, relative span, coefficient of uniformity, coefficient of gradation, geometric mean length). This implies the inadequacy of mechanical sieving, typically limited to under 10 sieves.
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• VBA Author(s): IC    Published: 05-Mar-2010

  TPDSci Link: http://www.tpdsci.com/Vba_.php?id=Igathinathane_C_2009_Sieveless_PSD_20100305

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• In: PSD measurement: Other techniques
   
  A mechanical sieve may be unable to retain an elongated particle whose length is greater than the sieve opening (mesh) size by a factor as large as 22, as shown by image analysis of the sieved particles (Igathinathane C et al 2009a). Similar length-based particle separation inconsistencies in mechanical sieving were also observed by Womac AR et al 2007.
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• VBA Author(s): IC    Published: 05-Mar-2010

  TPDSci Link: http://www.tpdsci.com/Vba_.php?id=Igathinathane_C_2009_Sieveless_PSD_Fall_20100305