The first normal stress of viscoelastic polymer solution increases with the increase of Weissenberg number the closer the wall of the bellows from the greater the first normal stress and the greater the effect of Weissenberg number on the first normal stress ;

黏弹性聚合物的第一法向应力随 威森 伯格 数（ We）的增大而增大，且越靠近壁面 处，第一法向应力越大，受We的 影响越大；