An Iterative Approach for the Parameter Estimation of Shear-Rate and Temperature-Dependent Rheological Models for Polymeric Liquids.

ABSTRACT: Numerical flow simulations play an important role in polymer processing. One of the essential prerequisites for accurate and precise flow simulations is to obtain accurate materials functions. In the framework of the generalized Newtonian fluid model, one needs to obtain shear viscosity as a function of the rate-of-shear and temperature-as determined by rheometry-and then fitted to a mathematical model. Often, many subjectively perform the fitting without paying attention to the relative quality of the estimated parameters. This paper proposes a unique iterative algorithm for fitting the rate-of-shear and temperature-dependent viscosity model under the time-temperature superposition (TTS) principle. Proof-of-concept demonstrations are shown using the five-parameter Carreau-Yasuda model and

SUBMITTER: Amangeldi M 

PROVIDER: S-EPMC8659470 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature