Static Mixer

A static mixer is a precision-engineered component within an industrial system designed to continuously mix two or more fluid streams (liquids, gases, or combinations) as they flow through a pipeline. It operates without external energy input or moving mechanical parts, relying solely on its internal geometric structure to divide, recombine, and redirect flow streams, thereby achieving homogeneous blending, heat transfer, or chemical reaction promotion through laminar or turbulent flow manipulation. The device consists of a series of fixed elements, such as helical baffles or twisted tapes, housed within a pipe or tube. As the fluid passes these elements, its flow is sequentially split, rotated, and recombined, increasing interfacial contact and promoting diffusion and distributive mixing. This results in a uniform mixture at the outlet without mechanical agitation. Static mixers are available in nominal diameters from DN15 to DN600 (ISO 6708), with 3 to 20 elements, and a mixing length of 1.5 to 3.0 times the pipe diameter. They operate at pressures from 1.0 to 1.6 MPa and temperatures from -20°C to 200°C, handling flow rates from 0.5 to 500 m³/h and viscosities from 1 to 100,000 mPa·s. Pressure drop ranges from 0.01 to 0.5 MPa, depending on flow rate, viscosity, and element count. Materials of construction include stainless steel 316L and polypropylene, with seal materials such as PTFE, EPDM, or Viton. Connections can be flanged, threaded, or welded (ANSI B16.5). Weight varies from 5 to 500 kg. These parameters are reference ranges; verify model-specific values with the manufacturer or supplier.

The static mixer functions by forcing the fluid stream through a series of fixed, helical, or patterned elements (baffles, plates, or twisted tapes) housed within a pipe or tube. As the fluid passes these elements, its flow is sequentially split, rotated, and recombined. This repeated division and recombination at each element incrementally increases interfacial contact between different fluid components, promoting diffusion and distributive mixing through controlled flow path manipulation, ultimately achieving a uniform mixture by the outlet without any mechanical agitation.