スピンラインレオメータによる高分子溶液の伸長粘度測定と流れの数値解析

抄録

The apparent elongational viscosity of concentrated polymer solutions was measured using a spinline rheometer; 0.1wt% and 1.0wt% solutions of polyacrylamide (PAA) showed a remarkable stretch-thickening property in elongational viscosity. Furthermore, numerical simulation of the elongational flow in the spinline rheometer was carried out using the modified Giesekus model. The apparent elongational viscosity was examined for various values of material constants in the modified Giesekus model including the values for the solutions of PAA and compared with the experimental results. It was found that the gravity force significantly affected the flow in the spinline and the apparent elongational viscosity in the simulation of the solutions of PAA.