Angle of Repose, Angle of Fall, Angle of Difference, Angle of Spatula

Angle of Repose: Under the static balance, the angle between the slope of a powder pile and the horizontal plane is Angle of Repose. It is measured when the powders fall to a surface via gravity and form a cone. It indicates the flowability of the powders. The smaller the Angle of Repose is, the better the flowability of the powders.

Angle of Fall: After measuring the Angle of Repose, apply an external force to the powder pile to collapse it. The angle between the slope of the collapsed pile and the horizontal plane is defined as Angle of Fall.

Angle of Difference: It means the difference between the Angle of Repose and the Angle of Fall. The larger the Angle of Difference is, the better flowability of the powders.

Angle of Spatula: immerse a plane in the powder pile; pull up the plane vertically, one angle is formed between the slope of the powders on the plane and the plane. Apply an external force to obtain another angle. The average of these two angles is Angle of Spatula. The smaller the Angle of Spatula is, the better the flowability of the powders. The Angle of Spatula is usually larger than the Angle of Repose.

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