Isolated mixing regions exist widely in the stirred tank, which is a major obstacle for efficient mixing. In order to increase the mixing efficiency, the method of multiple flow fields coupling, which can bring out fluid chaos, is used to increase fluid mixing efficiency by reducing the isolated mixing regions. The largest Lyapunov exponent and multi-scale entropy are investigated with the aid of Matlab in the coupling of eccentric air jet and rigid-flexible combined impeller system. Meanwhile, the effects ...