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Optimal Taylor–Couette flow: radius ratio dependence

Published online by Cambridge University Press:  10 April 2014

Rodolfo Ostilla-Mónico ,
Sander G. Huisman ,
Tim J. G. Jannink ,
Dennis P. M. Van Gils ,
Roberto Verzicco ,
Siegfried Grossmann ,
Chao Sun  and
Detlef Lohse
Rodolfo Ostilla-Mónico*
Affiliation:
Physics of Fluids, Mesa+ Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
Sander G. Huisman
Affiliation:
Physics of Fluids, Mesa+ Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
Tim J. G. Jannink
Affiliation:
Physics of Fluids, Mesa+ Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
Dennis P. M. Van Gils
Affiliation:
Physics of Fluids, Mesa+ Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
Roberto Verzicco
Affiliation:
Physics of Fluids, Mesa+ Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands Dipartimento di Ingegneria Meccanica, University of Rome ‘Tor Vergata’, via del Politecnico 1, 00133 Roma, Italy
Siegfried Grossmann
Affiliation:
Department of Physics, University of Marburg, Renthof 6, 35032 Marburg, Germany
Chao Sun
Affiliation:
Physics of Fluids, Mesa+ Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
Detlef Lohse
Affiliation:
Physics of Fluids, Mesa+ Institute, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
*
†Email address for correspondence: R.Ostillamonico@utwente.nl
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Abstract

Taylor–Couette flow with independently rotating inner ($i$) and outer ($o$) cylinders is explored numerically and experimentally to determine the effects of the radius ratio $\eta $ on the system response. Numerical simulations reach Reynolds numbers of up to $\mathit{Re}_i=9.5\times 10^3$ and $\mathit{Re}_o=5\times 10^3$, corresponding to Taylor numbers of up to $\mathit{Ta}=10^8$ for four different radius ratios $\eta =r_i/r_o$ between 0.5 and 0.909. The experiments, performed in the Twente Turbulent Taylor–Couette ($\mathrm{T^3C}$) set-up, reach Reynolds numbers of up to $\mathit{Re}_i=2\times 10^6$ and $\mathit{Re}_o=1.5\times 10^6$, corresponding to $\mathit{Ta}=5\times 10^{12}$ for $\eta =0.714\mbox{--}0.909$. Effective scaling laws for the torque $J^{\omega }(\mathit{Ta})$ are found, which for sufficiently large driving $\mathit{Ta}$ are independent of the radius ratio $\eta $. As previously reported for $\eta =0.714$, optimum transport at a non-zero Rossby number $\mathit{Ro}=r_i |\omega _i-\omega _o |/[2(r_o-r_i)\omega _o]$ is found in both experiments and numerics. Here $\mathit{Ro}_{opt}$ is found to depend on the radius ratio and the driving of the system. At a driving in the range between $\mathit{Ta}\sim 3\times 10^{8}$ and $\mathit{Ta}\sim 10^{10}$, $\mathit{Ro}_{opt}$ saturates to an asymptotic $\eta $-dependent value. Theoretical predictions for the asymptotic value of $\mathit{Ro}_{opt}$ are compared to the experimental results, and found to differ notably. Furthermore, the local angular velocity profiles from experiments and numerics are compared, and a link between a flat bulk profile and optimum transport for all radius ratios is reported.

JFM classification

Convection: Convection
Type
Papers
Information
Journal of Fluid Mechanics , Volume 747 , 25 May 2014 , pp. 1 - 29
Copyright
© 2014 Cambridge University Press 

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