Material flow in partially filled rotating cylinders (rotary
kilns) is encountered in many practical applications of material
processing, for example incineration, calcination, grain drying, etc.
The flow behaviour in the cross-section is important to other
transport mechanisms such as mixing and energy distribution within
the bed material. The paper describes an experimental study which was
carried out with the objective of understanding and improving our
predictive capabilities of the rheological behaviour of granular
materials in rotary cylinders. Measurement techniques similar to that
used in chute flows have been employed to measure flow
characteristics, e.g. particle velocities, granular temperature, and
solid concentration (in the shear layer developed between the free
surface and the bulk of the bed) for different materials having a
wide range of coefficients of restitution. The results of the
experiments provide the necessary assumptions, constraints, and data
for granular flows in partially filled rotating cylinders.
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