Fig. 8From: Numerical study of the square-root conformation tensor formulation for confined and free-surface viscoelastic fluid flowsDimensionless polymeric first normal stress difference, \(N_{1} = \left( \tau ^{'}_{yy}-\tau ^{'}_{xx}\right) /\left( \eta _{o}U/D\right) \), as function of x at \(y=0\) for the log-conformation and square-root formulations: \(De=0.1, 0.2, 0.3, 0.35\) Back to article page