dc.contributor.author | Lacassagne, T | |
dc.contributor.author | Cagney, N | |
dc.contributor.author | Balabani, S | |
dc.date.accessioned | 2021-06-03T13:46:17Z | |
dc.date.available | 2021-01-22 | |
dc.date.available | 2021-06-03T13:46:17Z | |
dc.date.issued | 2021-03-24 | |
dc.identifier.citation | Lacassagne, Tom et al. "Shear-Thinning Mediation Of Elasto-Inertial Taylor–Couette Flow". Journal Of Fluid Mechanics, vol 915, 2021. Cambridge University Press (CUP), doi:10.1017/jfm.2021.104. Accessed 3 June 2021. | en_US |
dc.identifier.issn | 0022-1120 | |
dc.identifier.uri | https://qmro.qmul.ac.uk/xmlui/handle/123456789/72290 | |
dc.description.abstract | We study the shear-thinning mediation of elasto-inertial transitions in Taylor-Couette flow of viscoelastic polymer solutions. Two types of high molecular weight polymers are used at various concentrations and in water-glycerol solvents of various viscosities. This allows us to access a wide range of elastic numbers and effective shear-thinning indices. Conservative ramp-up (slow acceleration of the inner cylinder and subsequent increase in Reynolds number) and steady-state (constant rotation speed) experiments are performed, in which the flow is monitored continuously using flow visualisation. Depending on the shear-thinning and elastic properties of the working fluid, very different behaviours are observed. In almost constant-viscosity fluids (Boger fluids), or shear-thinning fluids with significant elasticity, the flow transitions from purely azimuthal Couette flow (CF) to a highly chaotic flow state referred to as elasto-inertial turbulence (EIT) via Taylor vortex flow (TVF) and elasto-inertial rotating spiral waves (RSW). When the degree of shear-thinning is increased and elasticity reduced, elastic waves or EIT may fade to a wavy Taylor vortex flow (WTVF) with increasing inertia. Significant shear-thinning leads to a delay in the onset of EIT. Remarkably, in some highly shear-thinning cases, even with a significant elasticity, elastic flow features (EIT, RSW) are completely suppressed, and the flow exhibits a 'Newtonian-like' transition sequence (CF-TVF-WTVF). Shear-thinning acts to modify, delay, or even completely suppress elasto-inertial behaviours (RSW, EIT), that would otherwise have existed in the absence of shear-thinning. It is, thus, possible to induce various hydrodynamic regimes by tuning the relative degrees of shear-thinning, elasticity and inertia. | en_US |
dc.publisher | Cambridge University Press | en_US |
dc.relation.ispartof | Journal of Fluid Mechanics | |
dc.title | Shear-thinning mediation of elasto-inertial Taylor-Couette flow | en_US |
dc.type | Article | en_US |
dc.rights.holder | © The Author(s), 2021. Published by Cambridge University Press | |
dc.identifier.doi | 10.1017/jfm.2021.104 | |
pubs.notes | Not known | en_US |
pubs.publication-status | Published | en_US |
pubs.volume | 915 | en_US |
dcterms.dateAccepted | 2021-01-22 | |
rioxxterms.funder | Default funder | en_US |
rioxxterms.identifier.project | Default project | en_US |