In traditional pneumatic conveying systems, only bulk particle materials with particular qualities may be transported in dense phase and hence at low velocity. The term “conventional pneumatic conveying systems” refers to those where the material is supplied in the pipeline at a constant rate and is blown or sucked through the pipeline with a constant flow of air. In traditional pneumatic conveying systems, materials with strong air retention may typically be transported relatively naturally at low velocity in a moving bed-type of dense phase flow. Good permeability materials may typically be transported at low velocities as well, albeit in a dense phase flow mode similar to a slug or plug in traditional pneumatic conveying systems.

But most bulk particle materials that need to be pneumatically transported typically don’t have enough air retention or permeability for low-velocity dense phase conveying, thus, they can only be delivered in a traditional pneumatic conveying system using a dilute phase suspension flow.

The measurements, in Akron Abrasion Tester, are done through volumetric loss of a rotating specimen exposed to the action of a standard grinding wheel.

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