Research On Heat Transfer And Engergy Consumption Characteristics Of Polymer Field Synergistic Plasticzing System

Based on the calculus theory of polymer melt processing and the synergistic principle of enhanced heat transfer field,a synergistic plasticizing screw with polymer field is proposed.The core of the screw is a torsional element.The field synergistic screw has significant effect on increasing the radial temperature of polymer melt and improving the uniformity of melt temperature.On the basis of previous studies,this paper uses numerical simulation method to explore the influence of torsion element structure on its enhanced heat transfer performance and rotational energy consumption by changing the structural parameters of torsion element in field-synergistic screw metering section.The numerical simulation results are verified and analyzed by experiments.The main achievements of this paper are as follows:(1)By analyzing the numerical simulation results of a large number of torsion elements,it is shown that the structural parameters of torsion elements have an impact on the heat transfer enhancement effect,and the influence factors are not limited to the field synergy effect of torsion elements.The influence of groove depth,edge width,number of screw edges and inclination of screw edges on the enhanced heat transfer performance of the torsion element was studied based on the average temperature,standard deviation of temperature at the outlet of the torsion element and the heat transfer coefficient and field synergy of the whole surface of the torsion element.The results show that:The effect of different structure torsion elements on melt reversal is different,and the effect of screw angle on the enhanced heat transfer performance is weak.The field synergy number increases with the increase of groove depth and decreases with the increase of edge width and helix number;the surface heat transfer coefficient has an extreme value with the change of structural parameters;the same ratio of edge to width is introduced to measure the effect of structural parameters on heat transfer.The range of structural parameters with better heat transfer effect is determined:the groove depth,the edge width,The number of spiral edges and the inclination angle of spiral edges.(2)The structural parameters of the torsion element have an effect on its rotational energy consumption.On the basis of ensuring enhanced heat transfer,the influence degree of the structural parameters of the torsion element on its rotational energy consumption is explored through orthogonal design experiments,and the relationship between rotational power and rotational speed is analyzed.The results show that the influence of structural parameters of torsion elements on rotational energy consumption is in the order of inclination angle of screw edge>number of screw edges>width of screw edge>depth of groove.(3)Based on numerical simulation,torsion elements with different structures are designed and manufactured,which are divided into groove depth group,edge width group and screw edge array to verify and analyze the simulation results.The radial temperature of melt,the axial temperature of metering section and the current value of servo motor were collected.The results show that the experimental results are basically consistent with the numerical simulation results.At the same time,the field synergistic screw has significant effects on reducing the energy consumption of conveying,low temperature extrusion of melt and increasing the output of polymer.