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给出了3组等速旋转同向非对称自洁型双螺杆端面造型,并对3种螺杆构型与普通双螺杆端面混合行为进行了对比。基于Ployflow软件网格叠加技术,以满足Carreau定律的纯黏性流体为加工对象,得出速度场分布。运用粒子示踪技术,探索不同位置混合性能的差异。结果表明:新型非对称双螺杆中粒子分散时间较短,且较均匀。采用累积分散准数表征分散混合,分离尺度、界面拉伸长度表征分布混合能力,分析了不同构型混合性能的差异。
Three sets of isokinetic non-symmetric self-cleaning self-cleaning twin-screw end face shapes are given, and the mixing behavior of three kinds of screw configurations is compared with that of common twin-screw face. Based on the Ployflow grid superposition technique, the pure viscosity fluid satisfying Carreau’s law is used as the processing object, and the velocity field distribution is obtained. Use particle tracing technique to explore the differences in mixing performance at different locations. The results show that the dispersion time of the new asymmetric twin-screw is shorter and more uniform. The dispersive mixing, separation scale and interfacial tensile length were used to characterize the distribution and mixing ability by using the cumulative dispersion criterion, and the differences in the mixing performance of different configurations were analyzed.