“…However, the present ‘kayaking’ rotation mode is also found in the simulation by Wang et al. (2019). Figure 25.Orientation modes of a neutrally prolate particle () in viscoelastic shear flows with different elasticities.…”
supporting
confidence: 82%
“…Note that a small domain size of L × H × W = 2 × 2 × 2 is chosen in this test case to save the computational cost. Moreover, in earlier studies on the single effect (fluid inertia or fluid elasticity), the grid resolutions used for calculating the rotation of the spheroid are approximately Δ = 1/32D p for prolate spheroids in a Newtonian shear flow (Yu et al 2007) and Δ = 1/16 ∼ 1/42D p for spheroids (AR = 1.0 and 4.0) in a viscoelastic shear flow (Krishnan et al 2017;Wang et al 2019;Rosti & Brandt 2020). Therefore, both the present convergence test and the previous studies indicate that the particle rotation modes obtained using the mesh with the present mesh resolution (Δ = 1/32D p ) are reliable.…”
Section: A5 Grid Resolution Effectmentioning
confidence: 99%
“…Numerical simulations of the rotational dynamics of ellipsoids in viscoelastic shear flows have received extensive attention (Phan-Thien & Fan 2002; Nguyen-Hoang et al. 2008; Wang, Yu & Lin 2019). D'Avino et al.…”
Section: Introductionmentioning
confidence: 99%
“…2017; Wang et al. 2019; Rosti & Brandt 2020). Therefore, both the present convergence test and the previous studies indicate that the particle rotation modes obtained using the mesh with the present mesh resolution () are reliable.…”
Non-spherical particles exhibit peculiar behaviour in non-Newtonian flows. In this paper, we numerically investigate the dynamics of a neutrally buoyant prolate spheroid immersed in viscoelastic shear flows at finite Reynolds numbers by means of the immersed boundary method. Our results show that the period of particle rotation changes monotonically with the solvent viscosity ratio but non-monotonically with the mobility factor. Furthermore, we find five rotation modes of the spheroid under the effects of fluid inertia and fluid rheology in the present flow configuration. With weak fluid inertia, the particle rotation rate is remarkably reduced by fluid elasticity, which also induces asymmetric rotational behaviour. While the particle tends to tumble in the shear plane with weak fluid elasticity and moderate fluid inertia. However, as the fluid elasticity increases, the particle rotates with a newly observed mode, named the asymmetric-kayaking mode, which is classified by two additional critical elastic numbers that differ from the earlier studies on Stokesian viscoelastic shear flows. The present findings imply the importance of fluid inertia and fluid elasticity on the particle dynamics and could be potentially used to control the particle orientations in viscoelastic fluid flows.
“…However, the present ‘kayaking’ rotation mode is also found in the simulation by Wang et al. (2019). Figure 25.Orientation modes of a neutrally prolate particle () in viscoelastic shear flows with different elasticities.…”
supporting
confidence: 82%
“…Note that a small domain size of L × H × W = 2 × 2 × 2 is chosen in this test case to save the computational cost. Moreover, in earlier studies on the single effect (fluid inertia or fluid elasticity), the grid resolutions used for calculating the rotation of the spheroid are approximately Δ = 1/32D p for prolate spheroids in a Newtonian shear flow (Yu et al 2007) and Δ = 1/16 ∼ 1/42D p for spheroids (AR = 1.0 and 4.0) in a viscoelastic shear flow (Krishnan et al 2017;Wang et al 2019;Rosti & Brandt 2020). Therefore, both the present convergence test and the previous studies indicate that the particle rotation modes obtained using the mesh with the present mesh resolution (Δ = 1/32D p ) are reliable.…”
Section: A5 Grid Resolution Effectmentioning
confidence: 99%
“…Numerical simulations of the rotational dynamics of ellipsoids in viscoelastic shear flows have received extensive attention (Phan-Thien & Fan 2002; Nguyen-Hoang et al. 2008; Wang, Yu & Lin 2019). D'Avino et al.…”
Section: Introductionmentioning
confidence: 99%
“…2017; Wang et al. 2019; Rosti & Brandt 2020). Therefore, both the present convergence test and the previous studies indicate that the particle rotation modes obtained using the mesh with the present mesh resolution () are reliable.…”
Non-spherical particles exhibit peculiar behaviour in non-Newtonian flows. In this paper, we numerically investigate the dynamics of a neutrally buoyant prolate spheroid immersed in viscoelastic shear flows at finite Reynolds numbers by means of the immersed boundary method. Our results show that the period of particle rotation changes monotonically with the solvent viscosity ratio but non-monotonically with the mobility factor. Furthermore, we find five rotation modes of the spheroid under the effects of fluid inertia and fluid rheology in the present flow configuration. With weak fluid inertia, the particle rotation rate is remarkably reduced by fluid elasticity, which also induces asymmetric rotational behaviour. While the particle tends to tumble in the shear plane with weak fluid elasticity and moderate fluid inertia. However, as the fluid elasticity increases, the particle rotates with a newly observed mode, named the asymmetric-kayaking mode, which is classified by two additional critical elastic numbers that differ from the earlier studies on Stokesian viscoelastic shear flows. The present findings imply the importance of fluid inertia and fluid elasticity on the particle dynamics and could be potentially used to control the particle orientations in viscoelastic fluid flows.
“…17 Needless to say, the dynamics of non-spherical particles in flow may strongly differ from the spherical ones, especially when suspended in non-Newtonian liquids. 18–25…”
Fluid viscoelasticity drives spheroidal particles at the centerline of a square microchannel. After migration, the particles align with major axis along the flow direction. Migration dynamics is slower for more elongated particles.
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