In order to understand the intrinsic mechanism of heterogeneity

non-linearity and chaotic behavior of fluid system in Kenics static mixer (KSM)

the signals of tube-pressure fluctuation dynamics with different flow rates were collected with a high speed collector.Tube-pressure signals at different flow rates denoised by using the wavelet transform modulus maxima method were firstly decomposed to 1－7 scale detail signals and scale approximation and then evaluated by using multi-scale and R/S analysis method based on Daubechies second order wavelet.By analyzing the profiles of different scale signals

different fractal structures at different scales were found

and the similar trend of fractal structures with increasing flow rate was established.Besides

there were some non-periodic components in the system

and the similar energy exchange between particles caused the diffusion of turbulence

which was characteristic of an open system.The vortex with different scales would cause the chaos.The energy profiles of different scale signals indicated that pressure fluctuations mainly reflected the macro-scale interaction between vortex and liquid phase.