Abstract: Apparatus for mixing a material contained in a vessel comprises one or more flow channels and at least one pair of first and second members which are coaxially mounted one within the other about an axis of rotation such that their facing surfaces curve around the axis defining a chamber therebetween. At least one of the first and second members having a non-circular curvature, the first and second members being rotatable relative to one another about the axis to thereby produce a pumping force to force material through said flow channels. The radially outermost of said first and second members moves to a wall of the vessel relative to stress and displace material present between the mixing apparatus and the wall of the vessel.

Abstract: A process and apparatus for the mixing of material by means of the combination of sheer-dispersion and/or extensional-dispersion and distributive mixing actions, in which the mixing occurs in one or more stages within stress inducing flow channels between movable members whereby the material is essentially propelled through the flow channels of such stages by pumping actions provided by the relative movement between the members within the mixer itself.