High Deborah Number Flows of Viscoelastic Liquids in Long Tubes with Geometrically Complex Cross-Sections

将对粘弹性流体在非圆截面通道中的二次层流进行理论与实验相结合的研究。将研究矩形、椭圆和梯形剖面。流体的理论模型将是Giesekus模型和首席研究员开发的模型。数值模拟将采用有限元方法。实验将用几种非牛顿液体进行流变学表征。测量将使用LDV和双折射技术。二次流可以发生在内部流道中，例如发生在聚合物材料的成型和挤出中。它影响加工压力和制造零件的最终形状。＊＊＊

9320037 Leonov A combination of theoretical and experimental research will be conducted to describe secondary laminar flow of viscoelastic fluids in channels with non-circular cross-sections. Rectangular, elliptical, and trapezoidal sections are to be imvestigated. The theoretical models for the fluid will be the Giesekus model and one developed by the Principal Investigator. The numerical simulation will be with Finite Elements. The experiments will be with several non-Newtonian liquids, to be rheologically characterized. Measurements will be with LDV and birefringence techniques. Secondary flow can occur in internal flow passages such as occur in molding and extrusion of polymeric materials. It affects processing pressures and the final shape of manufactured parts. ***