open access

https://hdl.handle.net/2115/96072

An idea of a facile rheometry for evaluating shear-thinning viscosity

英語

2025-10-07

American Institute of Physics

Journal of Rheology

69(6)

925-938

Facile rheometry for estimating the shear-thinning viscosity of fluid foods based on their spreading behavior is proposed for on-site evaluation. The method called the gap flow test (GFT) aims to inversely estimate the rheological parameters K and n in the power-law model quantitatively by analyzing the temporal evolution of the radial spreading in the gap between parallel disks. Inspired by the line spread test used in clinical sites, GFT retains its simplicity in operation and affordability while enhancing reproducibility by preventing unstable spreading due to individual differences or material factors. The rheological parameters were estimated via a preconstructed database linking spreading characteristics to the rheological properties measured by rheometers. Numerical simulations based on a physical model describing spreading in GFT clarified how K and n influence the spreading dynamics. Validation tests of the method with homogeneous and heterogeneous fluids demonstrated that despite the current sparse database and the use of a simple fitting regression plane, the values of the properties obtained provide good estimations. The corresponding errors were attributable to extrapolation or insufficient shear, both of which could be mitigated by refining experimental conditions and expanding the database.

学術雑誌論文

Accepted Manuscript

The following article has been accepted by Journal of Rheology. After it is published, it will be found at https://doi.org/10.1122/8.0001046

0148-6055

1520-8516