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Study on Properties of Mixing Elements in Melt Conveying Zone of Intermeshing Counter-Rotating Twin Screw Extruder

Author: HeMin
Tutor: LuoBing
School: Beijing University of Chemical Technology
Course: Mechanical Design and Theory
Keywords: Mesh -rotating twin screw extruder Pin Particle tracking method Dispersive mixing Residence time distribution
CLC: TQ320.52
Type: Master's thesis
Year: 2007
Downloads: 197
Quote: 2
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Abstract


Meshing different to the twin-screw extruder has mandatory transportation of materials , material residence time is narrow , self-cleaning , materials by small shearing action , due to its lack of Hybrid Theory , to make it in mixed materials application is limited. Therefore , in order to improve different to the twin-screw extruder mixed ability can introduce new hybrid components , so that different to the twin-screw extruder broader applications . The first part of this paper is the introduction of the pin on the barrel of the melt conveying section through the three-dimensional isothermal flow field of conventional screw element and the introduction of a different number on the barrel , a different number of rows and different spacing pin components runner simulation and analysis . Dynamic simulation of the flow field through the particle tracer method and its statistical post-processing , the statistical results of the residence time distribution and the distribution of the maximum shear rate mixing elements mixed ability . The results show that : after the pin is introduced in the barrel of components than conventional threaded element have a better distribution and dispersion mixing capabilities . The second part is introduced in the melt conveying section VCR components , simulation and analysis of three-dimensional isothermal flow field of the conventional two-headed screw element , the three components and VCR components runner . Calculated by the current state of the flow field simulation dispersive mixing and conveying capacity of shear rate and pressure fields ; through dynamic simulation of the flow field of particle tracer method and its statistical treatment , has been staying time distribution and the distribution of the maximum shear rate results statistically relevant mixing elements mixed ability . The simulation results show that : the conventional double-headed screw element dispersed mixed strongest , followed by conventional three screw elements VCR components weakest ; VCR components distribution mixed the strongest the conventional three threaded component , followed by conventional stud screw element weakest. The second part of the experiment : experimental mixing elements obtained distribution and dispersive mixing capability relativities with simulation results are basically the same , indicating that the numerical simulation analysis method used in this paper can be used for the design and analysis of the new hybrid components .

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