关键词: micromixing;impinging streams;reactor

Abstract: Micromixing in the submerged circulative impinging stream reactor (SCISR) developed by the
authorsis investigated with the Bourne’s reaction scheme. The values measured for the
impinging velocity, u0, underthe conditions of SCISR normal operation, only is of the order
of 0.1 m.s-1, are much slower than that inferred,suggesting low power requirement for
operation. The values of the characteristic time constant for micromixing,tM, determined in
the impinging velocity range of 0.184m@s-1 ＜ u0 ＜ 0.326m@s-1 are ranged from 192ms to87
ms, showing that impinging streams promotes micromixing very efficiently. The data follow
approximately therelationship of tM ∝ u0-1.5. A comparative study shows that the
micromixing performance of SCISR is much betterthan that of the traditional stirred tank
reactor. The tM values predicted with the existing theoretical model aresystematically
longer than those measured by about 2-3 times, implying that the regularity of impinging
streamspromoting micromixing is unclear yet.

Key words: micromixing, impinging streams, reactor