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

Merbold, Sebastian; Hamede, Mohammed Hussein; Froitzheim, Andreas; Egbers, Christoph

doi:10.1098/rsta.2022.0113

Cited by 4 publications

(8 citation statements)

References 23 publications

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“…The top view TC Cottbus (TvTC) facility is used in the current study. Using this TC apparatus, the gap width is changeable by changing the inner cylinder (van der Veen et al 2016;Froitzheim et al 2017;Merbold et al 2023). In the current study the inner and outer cylinder radii used are R 1 = 7 mm and R 2 = 70 ± 0.2 mm, respectively, leading to a radius ratio of η = 0.1 and a gap width of d = R 2 − R 1 = 63 ± 0.2 mm.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…In contrast to the radial velocity, the azimuthal velocity shows a weak axial dependency in the bulk, but it varies near the inner and outer boundaries along the heights. The different flow regimes observed in the currently studied TC geometry are presented and discussed in detail in Merbold et al (2023).…”

Section: Dependence Of the Flow Structures On The Rotation Ratiomentioning

confidence: 99%

“…The huge variety of flow states in this system provides the possibility to study the flow in its different phases (laminar and turbulent) and the transition between these two phases (Taylor 1923;Chandrasekhar 1961;Dong & Zheng 2011;VanGils et al 2012). The different hydrodynamic instabilities that occur in the flow lead to the appearance of different patterns (Andereck, Liu & Swinney 1986;Razzak, Khoo & Lua 2019;Merbold et al 2023). The most famous example of the pattern formations in the flow is the centrifugally driven Taylor vortices (TV), which arise in both laminar and turbulent flows (Taylor 1923;Froitzheim et al 2019a;Huisman et al 2014;Grossmann, Lohse & Sun 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The different hydrodynamic instabilities that occur in the flow lead to the appearance of different patterns (Andereck, Liu & Swinney 1986; Razzak, Khoo & Lua 2019; Merbold et al. 2023). The most famous example of the pattern formations in the flow is the centrifugally driven Taylor vortices (TV), which arise in both laminar and turbulent flows (Taylor 1923; Froitzheim et al.…”

Section: Introductionmentioning

confidence: 99%

“…After the different flow regimes in counter-rotating TC flow in a very wide gap () were studied in Merbold et al. (2023), the scope of the present work is to study the turbulent statistics, , contributions to , and flow temporal behaviour. In this paper the physical behaviour of the fluid is studied in geometry, which has rarely been investigated up to today.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of turbulent counter-rotating Taylor–Couette flows for radius ratio η = 0.1

2023

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Turbulent Taylor–Couette flow between two concentric independently rotating cylinders with a radius ratio of $\eta = 0.1$ is studied experimentally. While the scope is to study the counter-rotating cases between both cylinders, the radial and azimuthal velocity components are recorded at different horizontal planes with high-speed particle image velocimetry. The parametric study considered a set of different shear Reynolds numbers in the range of $20\,000 \leq Re_s \leq 1.31 \times 10^5$ , with different rotation ratios of $-0.06 \leq \mu \leq +0.008$ . The observed flow fields had a clear dependence on the rotation ratio, where flow patterns evolved with a more pronounced axial dependence. The angular momentum transport is computed as a result of the recorded flow fields and given by a quasi-Nusselt number. The dependence of the Nusselt number on the different rotation ratios shows a maximum for the low counter-rotating case and $\mu _{max}$ is found between $-0.011 < \mu _{max} < -0.0077$ . The Nusselt number decreases for stronger counter-rotation until a minimum is reached, where it tends to increase again for higher counter-rotation rates. The space–time behaviour of the turbulent flow showed the existence of patterns propagating from the inner region towards the outer region for all studied counter-rotating cases. In addition, patterns have been found that tend to propagate from the outer region towards the inner region with a novel character at high counter-rotation cases. These patterns enhance the angular momentum transport where a second maximum in the transport mechanism has to be expected.

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Section: Experimental Set-upmentioning

confidence: 99%

Section: Dependence Of the Flow Structures On The Rotation Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of turbulent counter-rotating Taylor–Couette flows for radius ratio η = 0.1

2023

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Taylor–Couette and related flows on the centennial of Taylor’s seminalPhilosophical Transactionspaper: part 2

Hollerbach

Lueptow

Serre

2023

Phil. Trans. R. Soc. A.

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In 1923, the Philosophical Transactions published G. I. Taylor’s seminal paper on the stability of what we now call Taylor–Couette flow. In the century since the paper was published, Taylor’s ground-breaking linear stability analysis of fluid flow between two rotating cylinders has had an enormous impact on the field of fluid mechanics. The paper’s influence has extended to general rotating flows, geophysical flows and astrophysical flows, not to mention its significance in firmly establishing several foundational concepts in fluid mechanics that are now broadly accepted. This two-part issue includes review articles and research articles spanning a broad range of contemporary research areas, all rooted in Taylor’s landmark paper. 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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Experimental method for investigating the formation of flow patterns in a very wide gap Taylor-Couette flow (η = 0.1).

Hamede

Merbold

Egbers

2023

Tm - Technisches Messen

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In this study, we investigate the turbulent Taylor-Couette (TC) flow experimentally. First, in order to show the formation of the different patterns in the flow, the flow was seeded with kalliroscope particles and by applying a vertical laser sheet we were able to capture the different patterns in the flow. For a further detailed study, the flow field was measured in horizontal planes at different cylinder heights using Particle image velocimetry (PIV). The formation of patterns appears for the counter-rotation configuration where the outer cylinder rotates in the opposing direction of the inner cylinder rotation. For low shear Reynolds numbers, stable Taylor vortices fulfilling the whole gap appear for very low counter-rotation rates. While for the same rotation rates and higher shear Reynold number, large scale patterns with shorter length scale compared to the classical Taylor vortices appears, which can be described as interlaced fingers from in and outflow. The existence of these patterns leads to enhanced angular momentum transport.

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

Abstract: 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 centr… Show more

Cited by 4 publications

References 23 publications

Experimental investigation of turbulent counter-rotating Taylor–Couette flows for radius ratio η = 0.1

Experimental investigation of turbulent counter-rotating Taylor–Couette flows for radius ratio η = 0.1

Taylor–Couette and related flows on the centennial of Taylor’s seminalPhilosophical Transactionspaper: part 2

Experimental method for investigating the formation of flow patterns in a very wide gap Taylor-Couette flow (η = 0.1).

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