Numerical simulation of the hydrodynamics of yield stress fluids during dip coating

Zhang, Heng‐Kuan; Yin, Yaran; Zhang, Xianming; Chen, Shi-Chang; Hu, Guohua

doi:10.1016/j.jnnfm.2021.104675

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…The process is still a hot spot for research. The recent areas of study include coating a substrate with a suspension of spherical particles [40], the effect of substrate surface porosity on the entrainment process [42], the characteristics of the liquid sheet ejected by a rotating disc substrate under conditions of high inertia [29], the drag-out of non-Newtonian fluids [43,46] and deriving formulae to predict the flux of coating liquid on non-flat, e.g. circular, substrate [47].…”

Section: Introductionmentioning

confidence: 99%

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Parametric study of the oleophilic skimming process: CFD simulation using VOF model

Lotfy

2023

J Mar Sci Technol

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Oleophilic skimming is a primary alternative when addressing oil spill accidents. However, the existing literature does not define accurately the optimum design and operating conditions of the oleophilic skimmer. In this research, an extensive CFD investigation was conducted on the performance of the drum skimmer. Seven parameters were tested, namely drum diameter, drum centre height, oil slick thickness, rotational speed, oil density, oil viscosity and oil surface tension. The simulations were performed by applying the volume of fluid technique using the OpenFOAM package. The two-dimensional numerical setup was tested for grid size, domain extension and time-step convergence, and the results were validated with experimental data from the literature. The skimmer performance was evaluated through the oil recovery rate and water ingestion rate. The study illustrated that the oleophilic drum skimmer best functions at rotational speed within 30–60 rpm, drum diameter within 200–300 mm, drum centre-height-to-diameter ratio within 0.3–0.4, oil slick thickness $$\ge$$ ≥ 15 mm and oil viscosity within 10–100 cSt.

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Section: Introductionmentioning

confidence: 99%

“…circular, substrate [47]. The drag-out problem has been extensively modelled in the literature in its linear [19,46] and rotational [37] versions. However, very few, if any, publications considered simulating the multi-fluid oleophilic skimming process.…”

Section: Introductionmentioning

confidence: 99%

Parametric study of the oleophilic skimming process: CFD simulation using VOF model

Lotfy

2023

J Mar Sci Technol

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Functional peptide coatings

Liu,

2024

Peptide Self‐Assembly and Engineering

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The normal force evolution of the substrate during the withdrawal process

Zhang

Yin

Pan

et al. 2022

Polymer Engineering & Sci

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The evolution of normal force on the smooth plate immersed in Newtonian and yield stress fluids was investigated during the dip coating. The influences of withdrawal velocity, liquid rheological property, and plate roughness were elaborated. For all fluids, the variation of force versus the withdrawing height was divided into four stages. Importantly, the control forces for coating in each stage were determined, which are in turn viscous force-capillary, viscous forcegravity, capillary-viscous force, and gravity. The critical value of normal force controlled from capillary to viscous effect during drainage was adopted to calculate the surface tension. The possibility of measuring the surface tension was verified under the negligible interference of viscous effect and film instability through a detailed analysis on the evolution of force in a series of tests. Accordingly, the applicable conditions with the low withdrawal speed, high viscosity, and rough surface were finally achieved. This work can provide a theoretical basis for the film-formation mechanism and surface tension measurement in dip coating.

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Numerical simulation of the hydrodynamics of yield stress fluids during dip coating

Cited by 6 publications

References 26 publications

Parametric study of the oleophilic skimming process: CFD simulation using VOF model

Parametric study of the oleophilic skimming process: CFD simulation using VOF model

Functional peptide coatings

The normal force evolution of the substrate during the withdrawal process

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