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An in-line laminar flow motionless mixer mixes a low viscosity fluid into a high viscosity fluid. A first conduit section receives the high viscosity fluid and has a first set of slots. Injector nozzles extend into the first conduit section ahead of the slots with orifices which add the low viscosit

An in-line laminar flow motionless mixer mixes a low viscosity fluid into a high viscosity fluid. A first conduit section receives the high viscosity fluid and has a first set of slots. Injector nozzles extend into the first conduit section ahead of the slots with orifices which add the low viscosity fluid in the form of sheets. A second tubular section has a second series of slots formed orthogonally to the slots in the first section, and an annular connective jacket encloses the first and second set of slots and provides a flow path between the sections. A flow distributor extends within the respective and provides flow equalization. Method of mixing includes the injection of a low viscosity fluid as a striation. The composite flow is diverted circumferentially radially outwardly causing laminar shear mixing. The outward flow is cut into a smaller individual flows by slots, causing distributive and extensional mixing. The flows are recombined causing further distributive and laminar shear mixing. The combined flow is turned circumferentially radially inwardly and divided into smaller individual flows by a second plurality of slots, causing extensional and shear mixing to the composite flow, and the composite flow is recombined into an outflow.

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An in-line laminar flow mixer for mixing a second fluid into the mainstream flow of a first fluid, comprising: a first tubular section having an inlet which may be connected to receive therein said mainstream flow, an injection nozzle extending into said first tubular section and having an outlet sl

An in-line laminar flow mixer for mixing a second fluid into the mainstream flow of a first fluid, comprising: a first tubular section having an inlet which may be connected to receive therein said mainstream flow, an injection nozzle extending into said first tubular section and having an outlet slot for admitting a striation of said second fluid into said mainstream flow to form a composite flow, a first series of slots formed in said first tubular section downstream from said nozzle, means closing said first tubular section at a position downstream from said slots whereby said composite flow is caused to turn radially outwardly through said first series of slots, a second tubular section positioned in general axial alignment with said first tubular section, a second series of slots formed in said second tubular section, means closing said second tubular section at a position upstream from said second series of slots, said second tubular section having an outlet positioned downstream of said second series of slots, a circumferential jacket surrounding said sections and closed at one end at said first tubular section at a position upstream of said first series of slots and closed at an opposite end at said second tubular section at a position downstream of said second series of slots and defining with said first and second section an axial flow path encompassing said first and second series of slots whereby flow from said first section through said first series of slots is directed by said jacket to said second series of slots into said second section.