Particles and Geometric Shapes Analyzer APOGEO

Particles and Geometric Shapes Analyzer APOGEO

Katia Tannous (School of Chemical Engineering, University of Campinas, Brazil) and Fillipe de Souza Silva (School of Electrical and Computer Engineering, University of Campinas, Brazil)
Copyright: © 2015 |Pages: 12
DOI: 10.4018/978-1-4666-5888-2.ch349
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The influence of biomass particle shapes cannot be ignored in particle transport, mixing and fluidization. Various particle shapes result in different particle surface areas, which are heat and mass transfer processes (Guo et al., 2012). Rodriguez et al. (2013) have presented a review about different methods and techniques to determine the geometrical shape of the particles. They observed that there is no agreement on the usage of the descriptors and is not clear which descriptor is the best. A large scale shape classification has been a problem. In addition, the authors considered that image analysis is a promising tool; it presents advantages like low time consumption or repeatability.

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. 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). Particles in a stable orientation tend to have a maximum area causing microscopic measurements larger values than those presented by other methods, i.e., when smaller particle sizes are discarded.

This technique requires the analysis of a number of particles statistically significant, which has required the use of automatic image analysis programs, conducted with the aid of computers and specific software. This process includes several steps: 1) acquisition and image scanning, 2) pre- and post-processing of the scanned image, 3) measurements (shape, size and count), 4) analysis and data presentation (Papini, 2003).

Key Terms in this Chapter

Fluidized Bed: Technology related to the fine and large solids transforming into a fluid-like state through contact with a gas or liquid.

Recurrence or Recursion: A function or method that replicates itself into entries until reach the base case.

Graphical Interface: The interface between a human and a computer through windows, symbols and images.

Particle Sphericity: The description of the overall shape of the particle irrespective of angularity of edges and corners.

Data Structure: A particular way of storing information, allowing to a high level approach on the software implementation.

Image Processing: A computer technique which process a two dimensional picture.

Object-Oriented Programming: A programming paradigm that uses “objects” and their interactions to design applications and computer programs.

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