Cyclone furnaces are able to provide a thorough mixing of coal particles and air with sufficient turbulence to provide fresh air to surfaces of the coal particles.
In this image, the gas streams were labeled with blue and red "tracer dyes," and the purple color indicates thorough mixing of the two gas streams during the collapse.
Chocolate powder very quickly turns to a thick impenetrable paste when wetted and ingenious jetting technology was developed to ensure complete emptying of the capsule and thorough mixing.