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Painting Taylor vortices with cellulose nanocrystals: Suspension flow supercritical spectral dynamics

Ghanbari, Reza, 1984 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Max IV-laboratoriet,MAX IV Laboratory
Pashazadehgaznagh, Sajjad, 1994 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Sekar, Kesavan, 1998 (author)
Chalmers tekniska högskola,Chalmers University of Technology
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Nygård, Kim, 1978 (author)
Max IV-laboratoriet,MAX IV Laboratory
Terry, Ann (author)
Max IV-laboratoriet,MAX IV Laboratory
Liebi, Marianne, 1984 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Paul Scherrer Institut,Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL)
Matic, Aleksandar, 1968 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Kádár, Roland, 1982 (author)
Chalmers tekniska högskola,Chalmers University of Technology,Max IV-laboratoriet,MAX IV Laboratory
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 (creator_code:org_t)
2024
2024
English.
In: Physics of Fluids. - 1089-7666 .- 1070-6631. ; 36:4
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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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.

Subject headings

NATURVETENSKAP  -- Matematik -- Beräkningsmatematik (hsv//swe)
NATURAL SCIENCES  -- Mathematics -- Computational Mathematics (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

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art (subject category)
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