FLUID MECHANICS AND TRANSPORT PHENOMENA Characterization of Flow and Mixing in an SMX Static Mixer

Laminar flow and mixing of a Newtonian fluid are characterized in a four-element Koch-Glitsch SMX static mixer. The computational analysis on a fine, unstructured mesh containing more than 3.5 million tetrahedral elements led to high-resolution numerical data for ®elocity and pressure. Computed pressure drops agreed excellently with those in the literature. The flow in this static mixer is essentially independent of the flow rate up to Res1, thereby causing the flow characteristics to de®iate substantially from those obser®ed when Re-1. Furthermore, mixing beha®ior is examined using Lagrangian particle tracking simulations, as well as statistical methods to facilitate comparisons with experimental data. The mixing rate calculated from the simulations agreed closely with experimentally measured ®alues. Both exponential decrease in the ®ariation coefficient as a function of downstream length and the e®olution of a self-similar mixing structure are both e®idence of chaotic mixing in the SMX mixer.