Confined impinging jet reactor (CIJR) offers advantages for chemical rapid processes and has become an important new reactor used in the chemical industry. The micromixing efficiency in a T-shaped CIJR for two tubes of inner diameter of 3 mm was studied by using a parallel competing iodide-iodate reaction as the working system. In this work

the effects of different operating conditions

such as impinging velocity and acid concentration

on segregation index were investigated. In addition

the effects of the inner nozzles diameter and the distance

L

between the jet axis and the top wall of the mixing chamber on the micromixing efficiency were also considered. It is concluded that the best range of

L

in this CIJR is 6.5-12.5 mm. Based on the incorporation model

the estimated minimum micromixing time

t

m

of CIJR approximately equals to 2×10

-4

s. These experimental results indicate clearly that CIJR possesses a much better micromixing performance compared with the conventional stirred tank (micromixing time of 2×10

-3

to 2×10

-2

s). Hence

it can be envisioned that CIJR hasmore promising applications in various industrial processes.