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Two or more fluids, particularly viscous fluids, may be thoroughly blended and homogenized with a static mixer and method using a mixing element which comprises two or more banks of stationary baffles arranged around an axis parallel to the overall direction of flow of the fluids to be mixed. The ba

Two or more fluids, particularly viscous fluids, may be thoroughly blended and homogenized with a static mixer and method using a mixing element which comprises two or more banks of stationary baffles arranged around an axis parallel to the overall direction of flow of the fluids to be mixed. The baffles in each bank of the element are inclined at an angle to the overall flow axis and at an angle to the baffles of adjacent banks so that fluid streams are guided through windows or apertures formed by abutting baffles along the interface between adjacent banks. Each bank includes a plurality of substantially parallel baffle plates spaced along the axis, and at least one of the banks has a second set of substantially parallel baffle plates spaced along the axis and alternating with the first set of baffles. The baffles of the second set are inclined to the axis at an angle different from the inclination of the baffles of the first set so that alternately converging and diverging passages are formed between the baffles. By this means, fluid streams are successively and repeatedly subdivided, converged and redivided into a plurality of substreams in sinuous, non-parallel spiraling paths to effect a more thorough and efficient blending of the fluids than previously possible.

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