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Flodex Operation Manual—21-101-000 Rev. E—18 June 2019
Section 2 – Operation
Theory
A core of powder of the same diameter as a hole in the form of
a cylinder surrounded by powder will fall through the hole if the
weight of the core cylinder is greater than the friction of its side
surface.
(weight of powder in core cylinder)
core cylinder)
where:
= height of core cylinder of powder
= volume of core cylinder
= acceleration of gravity (980 cm / sec
= non-tapped bulk density of powder
= radius of hole (radius of core cylinder)
2
= surface area of core cylinder of powder
= coefficient of friction
By simplifying the previous equation, we can obtain:
Internal friction coefficient
where
is of sufficient magnitude to allow powder to fall freely.
The radius of a hole in the disk through which powder will fall
freely is:
In practice, when the weight of the core cylinder of powder
overcomes the side internal friction, the core cylinder will move;
if the powder has acceptable flowability, it will continue slowly
until the plane is inclined enough to stop the flow.
2
(friction on side surface of
2
)
490
490
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