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Painting Taylor vor...
Painting Taylor vortices with cellulose nanocrystals: supercritical spectral dynamics
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- Ghanbari, Reza, 1984 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Pashazadehgaznagh, Sajjad, 1994 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sekar, Kesavan, 1998 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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visa fler...
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- Nygård, Kim, 1978 (författare)
- Lunds universitet,Lund University
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- Terry, Ann (författare)
- Lunds universitet,Lund University
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- Liebi, Marianne, 1984 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Matic, Aleksandar, 1968 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Kádár, Roland, 1982 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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visa färre...
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(creator_code:org_t)
- 2023
- 2023
- Engelska.
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://doi.org/10.4...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- We study the flow stability and spatio-temporal spectral dynamics of cellulose nanocrystal (CNC) suspensions in a custom Taylor-Couette flow cell using the intrinsic shear induced birefringence and liquid crystalline properties of CNC suspensions for flow visualizations for the first time. The analysis is performed at constant ramped speed inputs of the independently rotating cylinders for several cases ranging from only inner or outer rotating cylinders to three counter-rotation cases. All CNC suspensions have measurable elastic and shear thinning, both increasing with CNC concentration. We show that the flow patterns recorded are essentially Newtonian-like, with non-Newtonian effects ranging from a decrease in wavenumbers to altering the critical parameters for the onset of instability modes. Outer cylinder rotation flow cases are stable for all concentrations whereas inner cylinder rotation flow cases transition to axisymmetric and azimuthally periodic secondary flows. However, unstable counter-rotation cases become unstable to asymmetric spiral modes. With increasing CNC concentration a counter-rotation case was found where azimuthally periodic wavy patterns transition to asymmetric spiral modes. In contrast to polymeric solutions of similar low to moderate elasticity and shear thinning, the shear-thinning region of CNC suspensions is expected to lead to the breakdown of the chiral nematic phase, whose elastic constants constitute the dominant structural elasticity mechanism. Thus, we interpret the Taylor-Couette stability of the CNC suspensions as dominated by their shear-thinning character due to the expected loss of elasticity in nonlinear flow conditions.
Ämnesord
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- Taylor-Couette instabilities
- spectral dynamics
- birefringence
- small-angle X-ray scattering
- cellulose nanocrystals
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Till lärosätets databas
- Av författaren/redakt...
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Ghanbari, Reza, ...
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Pashazadehgaznag ...
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Sekar, Kesavan, ...
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Nygård, Kim, 197 ...
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Terry, Ann
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Liebi, Marianne, ...
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visa fler...
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Matic, Aleksanda ...
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Kádár, Roland, 1 ...
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Matematik
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och Beräkningsmatema ...
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Materialteknik
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och Pappers massa oc ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Annan fysik
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Maskinteknik
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och Strömningsmekani ...
- Av lärosätet
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Chalmers tekniska högskola