By Hiroaki Masuda, Ko Higashitani, Hideto Yoshida
The Powder know-how Handbook, Third Edition offers a complete advisor to powder know-how whereas studying the elemental engineering strategies of particulate know-how. The publication deals a well-rounded viewpoint on powder applied sciences that extends from particle to powder and from easy difficulties to genuine functions.
Providing finished insurance of powder/particle dealing with equipment and unit operations, this guide prepares the reader for fixing new difficulties utilizing an built-in strategy. via proposing difficulties in rainy tactics and debris in drinks along these encountered with dry powder techniques, it deals thoughts for locating the optimum ideas to difficulties in any context. The booklet includes new sections on particle movement in fluids, layout and formula of composite debris, combustion and heating, electrostatic powder coating, attrition of a particle, breakage of aggregates, and the particle movement, rheology, and electric homes of a powder mattress. It additionally discusses lately constructed parts of research comparable to simulation, floor research, and nanoparticles.
Maintaining the normal of caliber present in the former bestselling variants, the 3rd variation of the Powder know-how Handbook displays the latest advances and offers handy entry to tactics and houses of particulate technology.
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Many of the older techniques are described, but many of these are now almost obsolete. In this chapter, theory will be minimal and only modern instruments will be discussed. For information on other methods, theory and detail, simply read the work by Allen. , backscattering or forward scattering) cross section as the particle; these will be different. 2 THE APPROACH There are several basic steps that might have to be followed from the initial thought that size distribution data are required. Some of these could be the following: 1.
23) where a and b are the major and minor radii of ellipse of gyration, respectively. In 3D inspection, a circumscribed polyhedron (rectangular prism) or sphere is employed and the factor is given by the ratio between the volumes. 3. 4. 4 Polygonal convex hull. indd 38 12/1/2005 1:03:06 PM Particle Shape Characterization 39 Concavity and Robustness This descriptor is based on mathematical relation. 26) Concavity ϭ (Ah Ϫ A)րAh . 9 The image processing technique gives the morphological descriptors.
But how are a platy shape and a flaky shape distinguished? Under present conditions, this distinction must depend on human visual judgments in many cases. Therefore, quantitative descriptions of particle shape will be necessary. Quantitative shape descriptors can be calculated from two- or three-dimensional (2D or 3D) geometrical properties and can be calculated by comparing with physical properties of the reference shape. The following are required for the shape descriptor3: • • • • • • Rotation invariance: values of the descriptor should be the same in any orientation.