A new slit‐radial die for simultaneously measuring steady state shear viscosity and first normal stress difference of viscoelastic liquids via capillary rheometry

A new slit-radial die capable of simultaneously obtaining steady state shear viscosity and the average first normal stress difference coefficient via capillary rheometry has been developed. The are calculated in slit part radial die, respectively. from is compared to viscosities obtained a also magnitude complex oscillatory experiment. value which transient experiment cone-plate geometry molecular function model predictions. effect variation power law fitting parameters (consistency index, k n) on discussed. As this shape city map Karlsruhe it named as die.