Circumferential speed

In English usage, peripheral speed is also called tip speed or circumferential speed. Peripheral speed describes the linear velocity of a point at the rotor circumference. It is important for shear forces, turbulence, and dust generation. It is calculated as

u = π⋅ d⋅ n

or in SI units

u = 2⋅ π⋅ r⋅ f

•  u is the peripheral speed
• d is the rotor diameter
•  r is the radius
• n is the rotational speed
• f is the rotational frequency.

A high peripheral speed leads to more intensive deagglomeration. This can change the structure and granulometry of the powder. In the presence of binders, agglomeration can even occur. A low peripheral speed, on the other hand, results in gentle conveying, in which the structures of the powders are better preserved.