TY  - JOUR
JF  - Journal of Non-Newtonian Fluid Mechanics
TI  - Scaling law for the viscoelasticity-induced particle migration in stirred vessels
SN  - 0377-0257
PB  - Elsevier BV
VL  - 309
AV  - public
N2  - In this study, we investigate the viscoelasticity-induced migration of solid particles immerged in the three-dimensional flow field created by the rotation of a Rushton turbine. At the same time, we propose a scaling law for predicting the characteristic particle migration time as a function of the Weissenberg number. Particle image velocimetry is adopted to reconstruct the three-dimensional velocity and deformation rate fields generated by the rotation of the Rushton turbine in both Newtonian and viscoelastic fluids; concurrently, particle tracking is used to measure the evolution of the particle distribution in the tank. The experimental campaign shows that the deformation rate field is essentially bi-dimensional and confined to the r-? plane. Accordingly, the particles migrate only in the radial direction driven by the presence of gradients of shear rate on the r-? plane. Finally, the scaling law is validated against experimental data obtained at different Weissenberg numbers, impeller diameters and fluid compositions. The results show good agreement between the scaling law and the experimental data.
ID  - discovery10155729
N1  - This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UR  - https://doi.org/10.1016/j.jnnfm.2022.104918
A1  - Meridiano, Giovanni
A1  - Weheliye, Weheliye Hashi
A1  - Mazzei, Luca
A1  - Angeli, Panagiota
Y1  - 2022/11//
ER  -