Motionless mixer

A motionless mixer for blending a fluid, comprising a tubular casing having a longitudinal axis and an inner cross-sectional contour;

• a fluid inlet and a fluid outlet axially spaced from one another in said casing and defining a flow direction of the fluid from the fluid inlet to the fluid outlet;
• a plurality of discs each having opposite faces and throughgoing apertures for allowing passage of the fluid;
• said discs having a periphery conforming to said inner cross-sectional contour;
• said discs being supported in said tubular casing in a face-to-face oriented relationship to form an axially extending disc stack;
• the apertures in said discs forming a core channel and fringe channels in said stack for dividing a fluid stream into a core stream and fringe streams in a first zone, for dividing the core stream into fringe streams in a second zone being downstream of said first zone as viewed in said flow direction and for centripetally combining said fringe streams into a central stream in a third zone being downstream of said second zone;
• and means for preventing said discs from angular displacements relative to one another;
• said discs comprising a first disc having a central opening and a plurality of spaced peripheral openings;
• a second disc adjoining downstream said first disc and having a central opening, a plurality of elongated openings extending radially from the central opening of the second disc, peripheral openings in said second disc situated between the elongated openings thereof;
• said peripheral openings in said second disc being in axial alignment with respective said peripheral openings of said first disc;
• a third disc adjoining downstream said second disc and having a plurality of peripheral openings being in alignment with respective said peripheral openings of said second disc and with outer zones of said elongated openings;
• a fourth disc situated downstream of said third disc and having a central opening;
• said fourth disc being maintained at an axial distance from said third disc by spacer means;
• said first disc being situated in said first zone, said second and third discs being situated in said second zone and said fourth discs being situated in said third zone.