Analysis of rheological properties of fibre suspensions in a Newtonian fluid by direct fibre simulation. Part1: Rigid fibre suspensions

Yamanoi, Mikio; Maia, João M.

doi:10.1016/j.jnnfm.2010.05.003

Cited by 26 publications

(12 citation statements)

References 29 publications

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“…The software has a potential to treat fibrous, platelet, ring, and more complex shapes as T-shaped, by changing the connecting information. The performance of our code for fiber suspension under shear was already reported recently [20][21][22].…”

Section: Introductionmentioning

confidence: 72%

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Stokesian Dynamics simulation of the role of hydrodynamic interactions on the behavior of a single particle suspending in a Newtonian fluid. Part 2. 2D flexible and rigid rings

Yamanoi

Pozo

Maia

2011

Journal of Non-Newtonian Fluid Mechanics

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a b s t r a c tIn this work, a Stokesian Dynamics simulation, which considers deformation due to induced flows, was performed in order to analyze the behavior of a ring-shaped particle in a Newtonian fluid under shear as well as corresponding rheological properties in the absence of Brownian motion. The following results are obtained: (1) the tumbling orbit is kept when ring is rigid, whereas the normal direction of the ring is the independent of the initial state after a large strain when the ring is flexible. (2) When the ring is flexible, there are two states under shear: a stable state, showing a constant tilt angle, and an unstable state, showing a tumbling motion. (3) When the ring is semi-flexible, in steady-state, i.e., after a large strain, a bi-axial nematic phase is predicted when the system is dilute.

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Section: Introductionmentioning

confidence: 72%

“…Flexible fiber suspensions were studied by Yamamoto and Matsuoka [15,16], and afterwards by many other direct fiber simulation techniques [17][18][19][20][21][22]. However, there are very few reports on dynamics of ring suspension.…”

Section: Introductionmentioning

confidence: 99%

Stokesian Dynamics simulation of the role of hydrodynamic interactions on the behavior of a single particle suspending in a Newtonian fluid. Part 2. 2D flexible and rigid rings

Yamanoi

Pozo

Maia

2011

Journal of Non-Newtonian Fluid Mechanics

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“…In this paper, the orientation information is estimated by the second-order tensor given in Eq. (11), which can be changed into the following form:…”

Section: Orientation Tensormentioning

confidence: 99%

“…In part 1 of this work 0377-0257/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jnnfm.2010.05.004 [11] the code was assessed and validated for rigid fibre suspension; the results showed that the code can predict rheological properties of rigid fibre suspensions in a Newtonian fluid qualitatively as well as quantitatively, except for very concentrated systems, where the model overpredicts the results for both viscosity (slightly) and elasticity (substantially) [12]. In this second part of the work rheological properties of straight flexible fibres in a Newtonian fluid are discussed to analyze the effect of fibre deformation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of rheological properties of fibre suspensions in a Newtonian fluid by direct fibre simulation. Part 2: Flexible fibre suspensions

Yamanoi

Maia

Kwak³

2010

Journal of Non-Newtonian Fluid Mechanics

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a b s t r a c tFlexible fibre suspensions in a Newtonian fluid experimentally show shear-thinning and normal stress differences in steady state. This paper discusses properties of the shear viscosity, Á, and the first and second normal stresses, N 1 and N 2 , using the help of direct fibre simulation based on PSM (particle simulation method), considering near-field hydrodynamic interactions, collision without attractively interacting forces and friction forces between fibres. The software reproduces the tendencies obtained experimentally such as shear-thinning and decreasing N 1 . In addition to this result, when the aspect ratio is low (<10) and the volume fraction varies between v = 0.05 and 0.1, shear-thickening and increasing N 1 are predicted. These tendencies are analyzed using the orientation of the end-to-end vector and the radius of gyration. The prediction of N 2 as a function of˙ is also shown in the paper.

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“…For example, the flocculation occurs in the forming process of fiber-reinforced composites and in pulp suspension flows in the manufacturing process of paper. Floc is a relatively weak aggregation, and hence it is relatively easily broken up by flow [4][5][6][7][8][9][10][11][12][13]. Although this approach provides detailed information on the flow-induced structure of flocs, it requires much expensive computational costs.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a Floc-Forming Fluid Using a Reversible Network Model

Yamamoto

2014

J. Text. Eng.

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A reversible network model was applied to a model for a floc-forming fluid such as a pulp suspension. The reversible network model approximately represents the evolution of polymer network structures using non-interacting elastic dumbbells that have two states, active and dangling. The former corresponds to a network segment whose both ends connect to the network, while the latter corresponds to a network segment that its one end dissociates from the network. The transition between the active and the dangling states is stochastically simulated according to probability functions. In the present study, the repetition of forming and breakup of flocs in a flow was modeled by the reversible network model, and the model was examined by evaluating rheology of the model fluid and by simulating its Poiseuille flow in a circular tube. The predictions confirmed that the present model was appropriate for a model of floc-forming fluids.

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Analysis of rheological properties of fibre suspensions in a Newtonian fluid by direct fibre simulation. Part1: Rigid fibre suspensions

Cited by 26 publications

References 29 publications

Stokesian Dynamics simulation of the role of hydrodynamic interactions on the behavior of a single particle suspending in a Newtonian fluid. Part 2. 2D flexible and rigid rings

Stokesian Dynamics simulation of the role of hydrodynamic interactions on the behavior of a single particle suspending in a Newtonian fluid. Part 2. 2D flexible and rigid rings

Analysis of rheological properties of fibre suspensions in a Newtonian fluid by direct fibre simulation. Part 2: Flexible fibre suspensions

Modeling of a Floc-Forming Fluid Using a Reversible Network Model

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