An Experimental Study on the Particle Size and Shape Distribution of Coal Drill Cuttings by Dynamic Image Analysis

Table 3

The definitions of some commonly used particle shape parameters.

Parameter	Definition	Formula
Circularity	The ratio of area-equivalent diameter to the perimeter-equivalent diameter
Form factor	The ratio of 4 times the projection area to the square of perimeter
Ellipse ratio	The ratio of Legendre ellipse minimum to Legendre ellipse maximum
Aspect ratio	The ratio of Feret minimum to Feret maximum
Irregularity	The ratio of max-inscribed circle diameter to min-circumscribed circle diameter