There is a special circumfluence in the center region of cross-section for a tri-screw extruder. To study the effect of the dynamic\r\ncenter region on the flow and mixingmechanism of the tri-screw extruder, 2D finite elementmodeling was used to reduce the axial\r\neffects. Based on the particle tracking technology, the nonlinear dynamics of a typical particle motions in the center region was\r\ncarried out and the mixing process in the tri-screw extruder was analyzed with Poincar�´emaps.Moreover, mixing evaluations of the\r\ntri-screw and twin-screw extruders were analyzed and compared. The results show that there are many multiple and fractional\r\nexcitation frequencies in the Fast Fourier Transform(FFT) spectrums, and it shows a chaoticmotion in the center region. Poincar�´e\r\nsection maps in the tri-screw show the better particles diffusive ability than those in the twin-screw extrude due to the excellent\r\ndiffluent ability. Furthermore, the tri-screw extruder has the better dispersive, distributive mixing abilities and stretching mixing\r\nefficiency than the twin-screw extruder in the cross-section.
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