Meridiano, Giovanni;
Weheliye, Weheliye Hashi;
Mazzei, Luca;
Angeli, Panagiota;
(2022)
Scaling law for the viscoelasticity-induced particle migration in stirred vessels.
Journal of Non-Newtonian Fluid Mechanics
, 309
, Article 104918. 10.1016/j.jnnfm.2022.104918.
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Abstract
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-θ plane. Accordingly, the particles migrate only in the radial direction driven by the presence of gradients of shear rate on the r-θ 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.
| Type: | Article |
|---|---|
| Title: | Scaling law for the viscoelasticity-induced particle migration in stirred vessels |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jnnfm.2022.104918 |
| Publisher version: | https://doi.org/10.1016/j.jnnfm.2022.104918 |
| Language: | English |
| Additional information: | 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. |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10155729 |
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