Question

Types of particle determination with different diameters

Answer 1

Answer:

Particles used in practice for gas-solid flows are usually nonspherical and polydispersed. For a nonspherical particle, several equivalent diameters, which are usually based on equiv- alences either in geometric parameters (e.g., volume) or in flow dynamic characteristics (e.g., terminal velocity), are defined.

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Answer 2

Answer:

The particle size of a spherical object can be unambiguously and quantitatively defined by its diameter. However, a typical material object is likely to be irregular in shape and non-spherical. The above quantitative definition of particle size cannot be applied to non-spherical particles.