Editing Mixing (process engineering) (section)

==Gas–solid mixing==
{{main article|Fluidization}}

Gas–solid mixing may be conducted to transport powders or small particulate solids from one place to another, or to mix gaseous reactants with solid catalyst particles. In either case, the turbulent eddies of the gas must provide enough force to suspend the solid particles, which otherwise sink under the force of [[gravity]]. The size and shape of the particles is an important consideration, since different particles have different [[drag coefficient]]s, and particles made of different materials have different [[Density|densities]].
A common unit operation the process industry uses to separate gases and solids is the [[cyclonic separation|cyclone]], which slows the gas and causes the particles to settle out.{{Cn|date=March 2025}}