74th Annual Meeting of the APS Division of Fluid Dynamics (November 21, 2021 — November 23, 2021)

V0042: Tussle of the Vortices

  • Shabnam Raayai, Harvard University
DOI: https://doi.org/10.1103/APS.DFD.2021.GFM.V0042

Textured surfaces are known for their ability to alter the physical response of the wall to the flow. This video explores the effect of 2D, streamwise grooves with different cross-sectional profiles (convex, V-groove, and concave) on the transition between Couette Flow and the Taylor vortex regime in a wide-gap Taylor-Couette cell as the rotation rate (i.e. Reynolds number) of the texture-covered inner cylinder is incrementally increased. The vortical patterns are visualized with fluorescent dye (Rhodamine 6G) illuminated by a continuous wave green laser (532 nm). With the smooth rotor, transition to the final 6-vortex state occurs quite early, while the rest of the rotors delay the transition sequentially to larger Reynolds numbers; convex rotor experiences the transition next, afterwards the V-groove, and finally the concave textures.

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