Abstract: An axially elongate mixing chamber defined by a mixer housing has a cylindrical sidewall and concave inwardly open hemispherical inlet and outlet end walls which form contiguous juncture with associated ends of the sidewall. A plurality of pressurized fluent materials to be mixed enter the mixing chamber from a manifold and through a common inlet passageway which terminates at a nozzle coaxially positioned within a cylindrical portion of the mixer housing. A plurality of equiangularlly spaced discharge passageways in the nozzle which terminate at discharge orifices redirect the material toward the juncture formed by the cylindrical sidewall and the hemispherical inlet end wall.