Numerical analysis of influence of melt viscoelastic rheological parameters on co-extrusion die swell for viscoelastic polymer;
熔体粘弹性流变性能参数对聚合物共挤成型离模膨胀影响的数值分析
Full three dimensional viscoelastic numerical simulation of die swelling process of polymer co-extrusion;
聚合物多层共挤成型离模膨胀过程的三维黏弹性数值模拟
The simulation revealed that the die swell increased with increasing relaxation time and volumetric flow rate.
针对异型材挤出成型流动过程的特点,基于PTT黏弹性本构模型,经合理假设,建立了描述其成型过程的三维等温黏弹性理论模型,并通过DEVSS／SUPG、最小元法Mini-Element和罚函数法等稳态有限元技术,建立了与该模型相适应的快速收敛的稳态有限元数值算法,并以此通过有限元数值模拟,系统研究了松弛时间和进口流量对异型材挤出成型过程的影响,得出了离模膨胀随松弛时间、进口流量增大而增大的规律。
The separation model has been given in this system.
使用体积排阻色谱 (SEC)柱和胶束流动相成功地分离了一些小分子化合物 ,给出了分离模型。
A separation model of ionizable and neutral enantiomers with cyclodextrin-sodium dodecyl sulphate (SDS) micellar electrokinetic chromatography was established.
建立了环糊精-十二烷基硫酸钠胶束电动色谱中可电高及电中性-光学异构体的分离模型。
A new particle separation model, which including the effects of particle turbulent dispersion and dust reentrainment, was set up in these regions.
在气固两相流的实验研究基础上,结合旋风管结构特点,将旋风管内分离空间分为5个区域,并考虑颗粒湍流扩散及灰斗返混夹带的影响,建立了颗粒分离模型。
Based on the progress in study of gas-solid separating model in cyclone separators,the modeling and analytical methods are compared in the fields of the concentration of solid particles,the in-teraction of solid particles,the unified affects of different factors dur-ing separating process and the gas-solid two-phase flow in the cy-clond separator.
综述旋风器内气固两相分离模型相关理论研究进展的基础上,从固相颗粒物浓度的影响、固相颗粒物间的相互作用、实际分离过程中各因素的综合作用以及旋风分离器内部的气固两相流动等方面,分析和比较了各模型的建模思想和分析方法,并展望今后分离模型的发展趋势。