Flow patterns in a non‐Newtonian fluid in a single‐screw extruder

Flow patterns in the channel of a screw extruder have been investigated in a study utilizing a model extruder with stationary screw and a rotating, transparent barrel. Photographs of flow streamlines at conditions over the full range of output restriction are presented for a non‐Newtonian fluid. A technique employing photographs of particle tracers was used with the same apparatus to permit quantitative measurement of velocity profiles with both a Newtonian and a non‐Newtonian fluid.