Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L35: Multiphase Flows: Turbulence
8:00 AM–10:36 AM,
Monday, November 20, 2023
Room: 202A
Chair: Francesco Zonta, Vienna Univ of Technology
Abstract: L35.00004 : Effect of Taylor rolls on two-fluid turbulent Taylor-Couette flow*
8:39 AM–8:52 AM
Presenter:
Naoki Hori
(University of Twente, Physics of Fluids)
Authors:
Naoki Hori
(University of Twente, Physics of Fluids)
Hao-Ran Liu
(University of Twente)
Detlef Lohse
(University of Twente)
Roberto Verzicco
(Univ of Roma Tor Vergata)
We find the presence of the secondary phase always increases the normalized torque compared to the reference single-phase case, which is attributed to the additional energy needed to keep the surface stretched. The torque computed numerically shows a clear deviation from an experimental work by Yi et al., JFM(912), 2021, which is explained by the effect of surfactants.
By investigating the flow fields, we observe that the secondary phase prefers to remain in the cores of the Taylor rolls and is almost absent from the plume-ejecting and -impacting regimes where the momentum is actively exchanged. This phase segregation results in totally different roles played by the two phases in the momentum transfer, highlighting an effect of the Taylor rolls on the interfacial dynamics.
*This research is a part of the project "AQUA - Water Quality in Maritime Hydrodynamics (P17-07)", which is financed by the Dutch Research Council (NWO).We acknowledge PRACE for awarding us access to MareNostrum4 at the Barcelona Supercomputing Center (BSC), Spain and IRENE at Très Grand Centre de Calcul (TGCC) du CEA, France (project 2021250115).
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