The angle of repose is a relatively simple technique for estimating the flow properties of a powder. It can easily be determined by allowing a powder to flow through a funnel and fall freely onto a surface.
The height and diameter of the resulting cone are measured, and the angle of repose is calculated from the below equation:
tanθ = h/r
Where,
- h = is the height of the powder cone and
- r = is the radius of the powder cone.
Angle of Repose (degrees) – Flow Property
- 25–30 = Excellent
- 31–35 = Good
- 36–40 = Fair
- 41–45 = Passable
- 46–55 = Poor
- 56–65 = Very poor
- >66 = Very, very poor
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