Are Roundness and Sphericity Same?

Sphericity is a measure of the degree to which a particle approximates the shape of a sphere, and is independent of its size. Roundness is the measure of the sharpness of a particle's edges and corners. ... Sphericity and roundness are ratios and, therefore, dimensionless numbers.

What do you mean by sphericity?

Sphericity is a measure of how spherical an object is. Proposed by Waddell in 1935, the sphericity of a particle is defined as the ratio of the surface area of an equal-volume sphere to the actual surface area of the particle: [2.21] where V_p is volume of the particle and A_p is the surface area of the particle.

What is the use of sphericity?

Sphericity or shape factors are most important shape parameter for non-spherical objects are used in solid-fluid mechanics, fluidized bed combustion, packed bed operations, immersed body in fluid, silo handling operations, geology, crystal geometry and physical analysis of solid particles where it is significant to ...