• CN：11-2187/TH
• ISSN：0577-6686

›› 2012, Vol. 48 ›› Issue (14): 70-77.

• 论文 •

带有扰动副螺棱的单螺杆挤出机内混沌混合

1. 广东轻工职业技术学院广东高校高分子材料加工工程技术开发中心;湖南工业大学先进包装材料与技术湖南省普通高校重点实验室
• 发布日期:2012-07-20

Chaotic Mixing in Single Screw Extruders with Reciprocating Baffle

XU Baiping;YU Huiwen;HE Liang;CHEN Jinwei;WANG Meigui;LIU Yuejun

1. Technology Development Center for Polymer Processing Engineering of Guangdong Colleges and Universities, Guangdong Industry Technical College Key Laboratory of Advanced Materials and Technology for Packaging of Hunan Universities, Hunan University of Technology
• Published:2012-07-20

Abstract: A geometry in which the mixing of single screw extruder is enhanced by a reciprocating baffle is proposed and the effect of baffle amplitude on mixing in the screw channel is investigated. The corresponding physical and mathematical models are developed. The periodic flow and mixing of Newtonian fluid in such an extruder are investigated. Finite volume method is used and flow domain is meshed by staggered grids with the periodic boundary conditions of the baffle motion being imposed by the mesh supposition technique. Fluid particles tracking is carried out by fourth order Runge-Kutta scheme and the Poincaré section mappings are used in order to show the scale of chaotic mixing. The evolution of mixing patterns of the tracers and their growth of interface stretch with time are obtained which are released from different initial positions. The results reveal that the reciprocating motion of the baffle can lead to chaotic mixing region surrounded by the pseudo-periodic regions with two KAM tubes inside. The tracers will experience the exponent growth with time when captured by the chaotic mixing zones with the linear growth when trapped in the pseudo-periodic zones. The larger the baffle amplitude is, the smaller the inner pseudo-periodic region is, the larger the chaotic mixing region is.