Fluid Dynamics - Flow of granular materials and powders

7 important questions on Fluid Dynamics - Flow of granular materials and powders

How is it called when all particles of a powder flow out well?

Mass flow.

What happens with a powder if the bottom of a silos is chirp enough?

You get funnel flow.

How is it called when a lot of powder sticks to the silos?

A rathole.
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How is it called when silos is clogged?

Arching

How can you influence flow behavior?

By adding a flow enhancer (very small particles)

What is the dilute mode?

Powder an granules are transported in the air. Done with an excess of air.
Disadvantages: costs a lot of energy, particles will collide and form dust.

What is the dense mode?

Air is blown away in specific places in a closed tube.
Disadvantages: Difficult to restart when it stopped. Large force may deform particles.

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