Akademik Veri Yönetim Sistemi
Signpoints, Karawal-Nagar, 2008
The effects of particle shape on the results of size analysis by different, commonly used, procedures are discussed. Differences in apparent size are evaluated for spheroidal particles with varying elongation from flattened (oblate) to extended (prolate) types. Simulations showing the effects of elongation on measured size for particles of equal volume are described. For procedures such as light scattering or obscuration, it is shown that the apparent size depends on particle orientation, leading to an apparent distribution of sizes for identical particles in random orientation. Similar, but much smaller effects are expected for sedimentation processes. A simple procedure is described for estimating elongation by comparing median sizes measured by different methods. Application to experimental data for crushed quartz suggests that the typical particle is slightly oblate, with an elongation of about 0.35. A similar application to kaolin particles gives an estimated elongation of about 0.046.