Rheo-PIV of yield-stress fluids in a 3D-printed fractal vane-in-cup geometry

Medina-Bañuelos, Esteban F. and Marín-Santibáñez, Benjamín M. and Chaparian, Emad and Owens, Crystal E. and McKinley, Gareth H. and Pérez-González, José (2023) Rheo-PIV of yield-stress fluids in a 3D-printed fractal vane-in-cup geometry. Journal of Rheology, 67 (4). pp. 891-908. ISSN 1520-8516 (https://doi.org/10.1122/8.0000639)

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Abstract

The vane-in-cup (VIC) geometry has been widely used for the rheological characterization of yield-stress fluids because it minimizes slip effects at the liquid/solid interface of the rotating geometry and reduces sample damage during the loading process. However, severe kinematic limitations arising from the spatial complexity of mixed shear and extensional flow have been identified for quantitative rheometrical measurements in complex fluids. Recently, vanes with fractal cross sections have been suggested as alternatives for accurate rheometry of elastoviscoplastic fluids. In this work, the steady fractal vane-in-cup (fVIC) flow of a Newtonian fluid and a nonthixotropic Carbopol® 940 microgel as well as the unsteady flow of a thixotropic κ-Carrageenan gel are analyzed using rheo-particle image velocimetry (Rheo-PIV). We describe the velocity distributions in all cases and show that the fVIC produces an almost axisymmetric flow field and rotation rate-independent “effective radius” when used with both the Newtonian fluid and the microgel. These findings are supported by 2D simulation results and enable the safe use of both the Couette analogy and the torque-to-stress conversion scheme for a 24-arm fVIC as well as validate it as a reliable rheometrical tool for characterization of a variety of complex fluids. With the κ-Carrageenan gel, however, axial shearing/compression while inserting the rheometric tool into the sample also accelerates syneresis that ultimately results in shear banding for Couette and fVIC flows. By comparing results obtained using the 24-arm fVIC with other conventional geometries, we investigate the effect that the lateral and cross-sectional (shearing/compressing) area of the measuring fixture have on disrupting the κ-Carrageenan gel during its insertion.

  • Item type:Article
    ID code:86156
    Dates:
    Date
    Event
    31 July 2023
    Published
    20 June 2023
    Published Online
    24 April 2023
    Accepted
    Notes:Copyright © 2023 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Medina-Bañuelos, E. F., Marín-Santibáñez, B. M., Chaparian, E., Owens, C. E., McKinley, G. H., & Pérez-González, J. (2023). Rheo-PIV of yield-stress fluids in a 3D-printed fractal vane-in-cup geometry. Journal of Rheology, 67(4), 891-908 and may be found at https://doi.org/10.1122/8.0000639
    Subjects:Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Depositing user: Pure Administrator
    Date deposited:18 Jul 2023 08:37
    Last modified:22 Apr 2024 00:56
    URI:https://strathprints.strath.ac.uk/id/eprint/86156
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