Multi-orifice cross-flow jet mixers (MOCJMs) are used in various industrial applications due to their excellent mixing efficiency

but few studies have focused on the micromixing performance of MOCJMs. Herein

the flow characteristics and micromixing performance inside the MOCJM were investigated using experiments and computational fluid dynamics (CFD) simulations based on the Villermaux/Dushman system and the finite-rate/modified eddy-dissipation model. The optimal

A

value was correlated with the characteristic parameters of MOCJMs to develop a CFD calculation method applicable to the study of the micromixing performance of the MOCJMs. Then the micromixing efficiency was evaluated using the segregation index

X

S

and the effects of operational and geometric parameters such as mixing flow Reynolds number (

Re

M

)

flow ratio (

R

F

)

total jet area (

S

T

)

the number of jet orifices (

n

)

and outlet configuration on the micromixing efficiency were investigated. It was found that the intensive turbulent region generated by interactions between jets

as well as between jets and crossflows

facilitated rapid reactions.

X

S

decreased with increasing

Re

M

and decreasing

R

F

. Furthermore

MOCJMs with lower

S

T

four jet orifices

and the narrower outlet configuration demonstrated a better micromixing efficiency. This study contributes to a

deeper understanding of the micromixing performance of MOCJMs and provides valuable guidance for their design

optimization

and industrial application.