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Glossary of Terms in Powder & Bulk Technology

5. Particle Properties

Written by Lyn Bates edited by mhd on 18. Sep. 2022
abrasiveness The ability of a particle to cause wear on a contact surface. This quality is determined by its hardness factor and sharpness of the points of contact. The actual degree of wear then depends on power factors of both the contact pressure and the relative velocity of the contact surfaces. Hard, sharp, angular shaped particles may be expected to be highly abrasive.
aerodynamic diameter The diameter in μm, of a unit density sphere that has the same terminal velocity in air as the particle in question.
apparent particle density (See density, apparent particle).
Blain fineness The fineness of a particulate material, expressed as the surface area per unit of mass.
Bond work index The energy required to reduce the size of unit mass of material from infinity to 100 μm in size.
Brownian motion The random movement of small particles in a disperse phase caused by the bombardment of molecules of the surrounding media.
classification Grading in accordance the particle size, shape, density or other attribute.
cleavage The tendency to cleave, or split, along definite parallel, closely spaced, particle planes of least cohesion.
coagulation The change from a fluid to a more or less irregular solid state.
coalescence The joining together of fluids originally separated by boundaries.
de-flocculation The breaking down of flocculates.
density, apparent particle The mass of a particle divided by its volume.
density, effective particle The mass of a particle divided by its volume including open pores and closed pores.
density, immersed particle The mass of a particle per unit volume of suspension fluid displaced.
density, true the mass of a particle divided by its volume, excluding open pores and closed pores.
dispersion The separation and distribution of one phase in another.
effective particle density (See density, effective particle).
electrokinetic potential (See zeta potential).
flocculation The coalescence of particles into floccs.
fouling The building up of particles onto surfaces because of the particles stronger attraction to the surface than to the fluid in which they are dispensed.

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