Entrainment of particles during the withdrawal of a fibre from a dilute suspension

Dincau, Brian; Mai, E.; Magdelaine, Quentin; Lee, J. Alex; Bazant, Martin Z.; Sauret, Alban

doi:10.1017/jfm.2020.643

Cited by 17 publications

(24 citation statements)

References 38 publications

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“…In this simple model, the effect of particle size is reminiscent of what is observed for the entrainment of suspension in dip-coating experiments in various geometries 35,37 .…”

Section: Capture Of Particles In the Filmmentioning

confidence: 86%

Generation and stability of cement soap films

et al. 2021

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“…In this simple model, the effect of particle size is reminiscent of what is observed for the entrainment of suspension in dip-coating experiments in various geometries 35,37 .…”

Section: Capture Of Particles In the Filmmentioning

confidence: 86%

Generation and stability of cement soap films

et al. 2021

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“…The above condition is further modified as * > 0.24 0 0.75 by Sauret et al 66 reducing the threshold capillary number and hence the critical film thickness for entrainment. However, for cylindrical geometry like fiber and wires, Dincau et al 52 derived the expression considering the particle and cylinder radius as: * ≅ 0.645 [ 3 (1 + 2.53 1.85 1 + 1.79 0.85 )] 1.5…”

Section: Discussionmentioning

confidence: 99%

“…The minimum film thickness required for neutrally buoyant particle entrainment (ℎ * ) on plate geometry has been reported as ℎ * ≥ 2 65 . Recent experimental studies suggested ℎ * ≥ 0.33 for plate geometry 66 and ℎ * ≥ 1.1 for fiber geometry 52 . However, we found entrained particles even at lower ℎ * which further investigated in the next section.…”

Section: Influence Of Binder Concentrationmentioning

confidence: 99%

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Micro-particle entrainment under stirred energy from liquid carrier system

Shovon

Alam

Khoda

2021

Preprint

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Controlled delivery of inorganic microparticles by the dipping process can open up 3D near-net-shape production techniques through sintering, robocasting or additive manufacturing, and material joining. However, micro-scale inorganic particles (d>1 µm) have reduced surface area and higher density, making them negatively buoyant in dip-coating mixtures and challenging for high yield solid transfer through entrainment due to the density mismatch. In this work, the physical phenomenon of the particle transfer process under stirring energy with negatively buoyant, non-Brownian micro-particles from density mismatching mixture is investigated. Liquid carrier system (LCS) solution is prepared by the combination of a binder polymer and an evaporating solvent. Inorganic micro-particles are dispersed with the assistance of a magnetic stirrer to maintain the suspension characteristics of the mixture. The effect of solid loading and the binder volume fraction on solid transfer has been reported. Two coating regime is observed (i) heterogeneous coating where particles clusters are formed at a low capillary number and (ii) effective viscous regime, where full coverage can be observed on the cylindrical substrate. In our experiment, we have not observed ‘zero’ particle entrainment even at the low capillary number of the mixture, which can be attributed to the presence of binder and hydrodynamic flow of the particles due to the stirring of the mixture. The critical film thickness for particle entrainment is found as ℎ * = 0.16a for 6.5% binder and ℎ * = 0.26a for 10.5% binder, which are smaller than previously reported. Furthermore, the transferred particle matrices are compared with the analytical expression of density matching suspension. The finding of this research will help to understand the high-volume solid transfer technique and develop a novel manufacturing process.

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“…The configuration of isolated particles is simpler to describe because the particles do not interact with each other. This configuration was considered for flat plates (Colosqui, Morris & Stone 2013;Sauret et al 2019) and fibres (Dincau et al 2020). The two-dimensional numerical study of Colosqui et al (2013) has shown that an isolated particle can be entrained in the coating film if the particle diameter d is smaller than the thickness at the stagnation point h * .…”

Section: Introductionmentioning

confidence: 99%

Dip coating of bidisperse particulate suspensions

et al. 2022

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Dip coating consists of withdrawing a substrate from a bath to coat it with a thin liquid layer. This process is well understood for homogeneous fluids, but heterogeneities, such as particles dispersed in liquid, lead to more complex situations. Indeed, particles introduce a new length scale, their size, in addition to the thickness of the coating film. Recent studies have shown that, at first order, the thickness of the coating film for monodisperse particles can be captured by an effective capillary number based on the viscosity of the suspension, providing that the film is thicker than the particle diameter. However, suspensions involved in most practical applications are polydisperse, characterized by a wide range of particle sizes, introducing additional length scales. In this study, we investigate the dip coating of suspensions having a bimodal size distribution of particles. We show that the effective viscosity approach is still valid in the regime where the coating film is thicker than the diameter of the largest particles, although bidisperse suspensions are less viscous than monodisperse suspensions of the same solid fraction. We also characterize the intermediate regime that consists of a heterogeneous coating layer and where the composition of the film is different from the composition of the bath. A model to predict the probability of entraining the particles in the liquid film depending on their sizes is proposed and captures our measurements. In this regime, corresponding to a specific range of withdrawal velocities, capillarity filters the large particles out of the film.

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Entrainment of particles during the withdrawal of a fibre from a dilute suspension

Abstract: Abstract

Cited by 17 publications

References 38 publications

Generation and stability of cement soap films

Generation and stability of cement soap films

Micro-particle entrainment under stirred energy from liquid carrier system

Dip coating of bidisperse particulate suspensions

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