Large-scale structure transitions in turbulent Taylor–Couette flow

Tokgöz, S.; Elsinga, Gerrit E.; Delfos, R.; Westerweel, J.

doi:10.1017/jfm.2020.679

Cited by 11 publications

(9 citation statements)

References 29 publications

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“…These are the first investigations of this geometry on counter-rotating cylinders, so the existence of TVF and WVF for these parameters is proven by our study, while also detached flows had been observed for narrow gaps, also this is proven for this strongly differing system. The ACV as a stable oscillating pattern is a newly made observation in TC flow, although similar singular structures had been made in other studies [20].…”

Section: Flow Patternssupporting

confidence: 71%

Flow regimes in a very wide-gap Taylor–Couette flow with counter-rotating cylinders

Merbold

Hamede

Froitzheim

et al. 2023

Phil. Trans. R. Soc. A.

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In this study, we discuss the observed flow regimes in Taylor–Couette flow of radius ratio η = 0.1 for various Reynolds numbers up to 1.5 × 10 4 . We investigate the flow using a visualization method. The flow states in the centrifugally unstable flow are investigated in the case of counter-rotating cylinders and pure inner cylinder rotation. Beside classical known flow states as Taylor-vortex flow and wavy vortex flow, we observe a variety of new flow structures in the cylindrical annulus, especially for the transition to turbulence. Coexisting turbulent and laminar regions inside the system are observed. Turbulent spots and turbulent bursts are observed, as well as an irregular Taylor-vortex flow and non-stationary turbulent vortices. Especially, a single axially aligned columnar vortex between the inner and outer cylinder is found. The principal regimes observed in flow between independently rotating cylinders are summarized in a flow-regime diagram. This article is part of the theme issue ‘Taylor–Couette and related flows on the centennial of Taylor’s seminal Philosophical Transactions paper (part 2)’.

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Section: Flow Patternssupporting

confidence: 71%

Flow regimes in a very wide-gap Taylor–Couette flow with counter-rotating cylinders

Merbold

Hamede

Froitzheim

et al. 2023

Phil. Trans. R. Soc. A.

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“…These studies also investigated the mechanisms that exist for large enough Reynolds number, for momentum transport in the anticyclonic range with changing rotation number, with these findings largely supported by the later experimental observations of Kawata & Alfredsson (2019). Similar results for the angular momentum transfer in TCF were found both in the numerical simulations of Brauckmann et al (2016) and in the experimental observations of Tokgoz et al (2020).…”

Section: Introductionsupporting

confidence: 64%

Onset of vortex structures in rotating plane Couette flow

2021

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“…[49,83]) as well as fully turbulent flows (e.g. [84]), and particle suspensions [85,86], most of the time in false(r−zfalse) vertical planes (see figure 2). The challenge in applying PIV to elasto-inertially turbulent flows resides, as for conventional turbulence, in the high-flow velocities and short-lived flow structures that need to be captured requiring high-speed systems to achieve good temporal resolution [84].…”

Section: Flow Configuration Key Parameters and Experimental Methodsmentioning

confidence: 99%

“…[84]), and particle suspensions [85,86], most of the time in false(r−zfalse) vertical planes (see figure 2). The challenge in applying PIV to elasto-inertially turbulent flows resides, as for conventional turbulence, in the high-flow velocities and short-lived flow structures that need to be captured requiring high-speed systems to achieve good temporal resolution [84]. For that purpose, laser Doppler velocimetry (LDV) was used by [53] to access local velocity information within the gap at high temporal resolution.…”

Section: Flow Configuration Key Parameters and Experimental Methodsmentioning

confidence: 99%

“…Finally, apart from the optical methods, TC flow characterization setups offer the possibility to measure the torque exerted on the rotating cylinder [46][47][48]85,90,91] (see figure 2). Torque measurements are either used to detect the onset of secondary flows [46,47] or in a more elaborate way to discuss the evolution of friction properties with the variations of control parameters [17,48,84,90]. This can also be used as a way to detect polymer degradation during an experiment [47].…”

Section: (Iii) Flow Characterizationmentioning

confidence: 99%

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Experimental insights into elasto-inertial transitions in Taylor–Couette flows

Boulafentis

Lacassagne

Cagney

et al. 2023

Phil. Trans. R. Soc. A.

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Since the seminal work of Taylor in 1923, Taylor–Couette (TC) flow has served as a paradigm to study hydrodynamic instabilities and bifurcation phenomena. Transitions of Newtonian TC flows to inertial turbulence have been extensively studied and are well understood, while in the past few years, there has been an increasing interest in TC flows of complex, viscoelastic fluids. The transitions to elastic turbulence (ET) or elasto-inertial turbulence (EIT) have revealed fascinating dynamics and flow states; depending on the rheological properties of the fluids, a broad spectrum of transitions has been reported, including rotating standing waves, flame patterns (FP), and diwhirls (DW). The nature of these transitions and the relationship between ET and EIT are not fully understood. In this review, we discuss experimental efforts on TC flows of viscoelastic fluids. We outline the experimental methods employed and the non-dimensional parameters of interest, followed by an overview of inertia, elasticity and elasto-inertia-driven transitions to turbulence and their modulation through shear thinning or particle suspensions. The published experimental data are collated, and a map of flow transitions to EIT as a function of the key fluid parameters is provided, alongside perspectives for the future work. This article is part of the theme issue 'Taylor–Couette and related flows on the centennial of Taylor’s seminal Philosophical Transactions paper (part 1)'.

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Large-scale structure transitions in turbulent Taylor–Couette flow

Abstract: Abstract

Cited by 11 publications

References 29 publications

Flow regimes in a very wide-gap Taylor–Couette flow with counter-rotating cylinders

Flow regimes in a very wide-gap Taylor–Couette flow with counter-rotating cylinders

Onset of vortex structures in rotating plane Couette flow

Experimental insights into elasto-inertial transitions in Taylor–Couette flows

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