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Species A diffuses into liquid film B flowing with a given velocity profile. The interface concentration limit is (Ref. 5).
Velocity profile varies throughout the channel periodically due to the sidewalls. The maximum of the profile shifts from the center and periodically sweeps the transverse direction, overlapping the progressing diffusion fronts which results in the enhancement of diffusion.
Evaluation of mixing performance using color changes as a result of mixing of a indicator (phenolphthalein) and a basic solution (sodium hydroxide, ).
(a) Mixing performance at a given mixing length as a function of flow Reynolds number, (b) Mixing performance at a given flow rate (, ) as a function of mixing length.
Microparticle image velocimetry measurement of the laminar flow. Bottom layers move faster than the top layers at section A, whereas in section B the situation is reversed confirming passive variation of the velocity profile.
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