Broad shear rate viscosity measurements via reconstruction of fluid velocity profiles in contaminant melts

摘要

A method of building velocity profiles from through the thickness, in situ, optical observations in polymer melts is discussed. It is shown that it is not necessary to know particle position across the thickness of the slit to allow for accurate shear rate determination. Coupled with a pressure drop measurement, the accurate velocity profile is transformed in a broad band viscosity vs. shear rate curve. Controversial resolution limitations are discussed aong with experimental data.