Projected images in microscopes (optical, scanning and transmission) are in two-dimensional and depend on the orientation of the particles (Turbitt-Daoust, Alliet, Kaye, & Matchett, 2000). When non-spherical solid particles are observed through a microscope, various methods can be used for their sizing, resulting in terms of an equivalent spherical particle. In addition, the authors considered that image analysis is a promising tool it presents advantages like low time consumption or repeatability. A large scale shape classification has been a problem. They observed that there is no agreement on the usage of the descriptors and is not clear which descriptor is the best. (2013) have presented a review about different methods and techniques to determine the geometrical shape of the particles. Various particle shapes result in different particle surface areas, which are heat and mass transfer processes (Guo et al., 2012). The influence of biomass particle shapes cannot be ignored in particle transport, mixing and fluidization.
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