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Counter-rotating suspension Taylor–Couette flow: pattern transition, flow multiplicity and the spectral evolution

Published online by Cambridge University Press:  27 June 2022

Suryadev Pratap Singh Open the ORCID record for Suryadev Pratap Singh [Opens in a new window] ,
Manojit Ghosh Open the ORCID record for Manojit Ghosh [Opens in a new window]  and
Meheboob Alam Open the ORCID record for Meheboob Alam [Opens in a new window]
Suryadev Pratap Singh
Affiliation:
Engineering Mechanics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India
Manojit Ghosh
Affiliation:
Engineering Mechanics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India
Meheboob Alam*
Affiliation:
Engineering Mechanics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India
*
†Email address for correspondence: [email protected]
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Abstract

Inertial transitions in a suspension Taylor–Couette flow are explored for the first time via experiments in the counter-rotation regime (i.e. the rotation ratio $\varOmega =\omega _o/\omega _i<0$, where $\omega _i$ and $\omega _o$ are the angular speeds of the inner and outer cylinders, respectively) up to a particle volume fraction $\phi \leq 0.2$. The primary bifurcation from the circular Couette flow (CCF) is found to yield patterns similar to those in a particle-free Newtonian fluid, and is supercritical at $|\varOmega |\leq 0.5$ but becomes hysteretic at large $|\varOmega |=1$. It is shown that the states with different numbers of vortices can coexist over a large range of shear Reynolds number $\mbox {Re}_s(\phi )$, confirming multi-stable behaviour of the primary and higher-order states for any particle loading at $|\varOmega |\leq 0.5$. A quasi-periodic state characterized by two incommensurate frequencies, namely, the modulated wavy vortices (MWV), is found at $\varOmega =-0.5$ as a tertiary bifurcation from the wavy Taylor vortices (WTV), with the stationary Taylor vortex flow (TVF) being the primary bifurcating state from CCF at $\phi \geq 0$. A novel sequence of transitions ${\rm TVF}\to {\rm MWV}_1\to {\rm WTV}\to {\rm MWV}$, with another variant of modulated vortices (MWV$_1$) appearing directly from TVF as a secondary bifurcation, may also occur even for the particle-free ($\phi =0$) case; the coexistence/non-uniqueness of WTV and MWV states is demonstrated over a range of $\mbox {Re}_s$ values spanning the secondary and tertiary bifurcation loci. At $\varOmega =-1$, the primary bifurcation yields an oscillatory state (spiral/helical vortex flow) that gives birth to another oscillatory state (interpenetrating spiral vortices) and a non-periodic state (non-propagating interpenetrating spirals, NIS) as secondary and tertiary bifurcations, respectively, with NIS being characterized by the absence of frequency peaks in the power spectrum of the scattered light intensity. For all transitions at $\varOmega < 0$, the critical values of $\mbox {Re}_s^c(\phi )$ decrease with increasing $\phi$, with more destabilizing effects of particles being found at larger $|\varOmega |$. The effect of particle loading is found to (i) decrease the amplitude and (ii) increase the wavelength of wavy vortices, with the latter seeming to be responsible for the decreased propagation frequencies of azimuthal waves with increasing $\phi$. The normalized rotation frequency of spiral vortices also decreases with increasing $\mbox {Re}_s$ and $\phi$, and a scaling relation in terms of the relative viscosity is found to collapse the frequency data for all $\phi$.

JFM classification

Complex Fluids: Suspensions Nonlinear Dynamical Systems: Bifurcation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 944 , 10 August 2022 , A18
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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