The Hausner ratio is a number that is correlated to the flowability of a powder or granular material. It is named after the engineer Henry H. Hausner.

How is Hausner ratio calculated?

The Hausner ratio⁶ expressed as the tap density divided by the bulk density, H_r = ρ_tap/ρ_b, and related Carr index,⁷ CI = 1 − 1/H_r, are used to indicate the flowability of granular powders in a wide variety of industries.

What is Carrs index formula?

Carr's Index Formula

Carr_Index = (ρ_tapped-ρ_bulk)/ρ_tapped*100. With. ρ_tapped : the tapped bulk density of the material (kg/m³)