Product Characterization and Classification

The characterization and classification of bulk solids is becoming an increasingly important design requirement to assess the suitability of 

Possibly, the most difficult aspect of determining particle size is selecting initially the correct or relevant definition and then calculating a mean or average diameter to represent the complete bulk solid. To some extent, this will depend on the following. 

In some cases, especially for very fine powders, researchers have looked at other properties to explain or classify product behavior. For example, Gel dart et al. (1984) have found that the ratio of tapped to aerated bulk density provides a good indication of the likely fluidization characteristics of fine and cohesive powders. 

However, this section pursues particle size measurement and evaluates its importance (as well as density) for the purpose of classifying the suitability of powders for long-distance pneumatic conveying applications. Initially, an appreciation of the fundamentals and the existing powder classification techniques is required. 

Physical Properties. To determine or calculate particle size, it is important to be aware of the following different definitions and related properties (Geldart and Abrahamsen, 1981 Allen, 1975). 

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