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Painting Taylor vor...
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Ghanbari, Reza,1984Chalmers tekniska högskola,Chalmers University of Technology,Max IV-laboratoriet,MAX IV Laboratory
(author)
Painting Taylor vortices with cellulose nanocrystals: Suspension flow supercritical spectral dynamics
- Article/chapterEnglish2024
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LIBRIS-ID:oai:research.chalmers.se:e80b9aa7-2ec9-430f-83f9-969e60e7dae0
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https://doi.org/10.1063/5.0195130DOI
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https://research.chalmers.se/publication/540932URI
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Language:English
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Summary in:English
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We study the flow stability and spatiotemporal 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 elasticity 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, 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. Based on rheo-SAXS measurements, 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.
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Pashazadehgaznagh, Sajjad,1994Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sajjadp
(author)
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Sekar, Kesavan,1998Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sekar
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Nygård, Kim,1978Max IV-laboratoriet,MAX IV Laboratory
(author)
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Terry, AnnMax IV-laboratoriet,MAX IV Laboratory
(author)
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Liebi, Marianne,1984Chalmers tekniska högskola,Chalmers University of Technology,Paul Scherrer Institut,Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL)(Swepub:cth)liebi
(author)
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Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic
(author)
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Kádár, Roland,1982Chalmers tekniska högskola,Chalmers University of Technology,Max IV-laboratoriet,MAX IV Laboratory(Swepub:cth)kroland
(author)
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Chalmers tekniska högskolaMax IV-laboratoriet
(creator_code:org_t)
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In:Physics of Fluids36:41089-76661070-6631
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