Particle-assisted dynamic wetting in a suspension liquid jet impinged onto a moving solid at different flow rates

Yamamura, Masato; Matsunaga, Atsushi; Mawatari, Yoshihide; Adachi, Kohsuke; Kage, Hiroyuki

doi:10.1016/j.ces.2006.04.017

Cited by 9 publications

(14 citation statements)

References 17 publications

(22 reference statements)

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“…Yamamura et al . [19,20] examined a noninteracting particle-solution system. They studied two different flow geometries; one is similar to slot die coating and the other is a falling circular jet.…”

Section: Introductionmentioning

confidence: 99%

Slot die coating of dilute suspensions

Lin

Chu

Liu

2008

Asia-Pacific J Chem Eng

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An experimental study was carried out to investigate slot die coating of dilute suspensions. Polymethyl methacrylate (PMMA) particles of different sizes were added to glycerol solutions as test fluids. The coating flow experiment was performed on a lab coater. The operating window, which is a domain in which only a stable and uniform coating solution is possible, was determined experimentally. It was found that adding particles has little effect on the physical properties of glycerol solutions, as only the fluid viscosity increases slightly. Two coating defects are commonly observed; ribbing which is caused by flow instability refers to lateral waves on the coated surface, and air entrainment which implies that air bubbles are trapped in the coating solution. Adding particles has little effect on the operating window if the coating defect is ribbing. However, the operating window can be expanded substantially if the coating defect is air entrainment. Higher the particle concentration, or the smaller the particle size, more significant is the expansion of the operating window. The maximum coating speed may increase to 80% for high suspension particle density number. A previous study reported that there exists an optimal particle size which has the largest operating window for a given pure solution; this was not found in the present work. 

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Section: Introductionmentioning

confidence: 99%

Slot die coating of dilute suspensions

Lin

Chu

Liu

2008

Asia-Pacific J Chem Eng

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“…12. On the basis of the film‐splitting hypothesis, Yamamura et al [22, 23] developed the following formula to predict the maximum coating speed from the lubrication theory: where U ae0 is the maximum coating speed of the pure solution, U ae is the maximum coating speed of the suspension, l is the air film length, and Ca * is a capillary number defined as where μ A is the air viscosity.…”

Section: Resultsmentioning

confidence: 99%

“…3 simplifies to Reasonable agreements between Eq . 5 and experimental results were obtained for Re < 20 for vertical jet coating [23]. However, addition of particles had no effect on the appearance of air entrainment if the air film length l was reduced, or if the viscosity of the coating solution was too high.…”

Section: Resultsmentioning

confidence: 99%

“…However, the ribbing defect appeared not to be affected in the presence of particles. Yamamura et al [23] later examined the vertical circular jet coating of dilute suspensions, and found that adding particles in solutions could only increase the maximum coating speed at low flow rates for low viscosity solutions. The presence of particles was found to significantly affect jet coating behavior only when Reynolds number was less than 20.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of particles was found to significantly affect jet coating behavior only when Reynolds number was less than 20. Even though the findings of Yamamura et al [23] on a circular vertical jet are informative and interesting, experimental studies on a laboratory‐scale curtain coating device would be more appealing for industrial applications. It is the aim of the present study to examine the curtain coating behavior of dilute PMMA/glycerol suspensions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Curtain coating of dilute suspensions

Chang

Shih

Liu

et al. 2011

Polymer Engineering & Sci

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An experimental study was carried out to investigate the effects of particles in coating suspensions on the curtain coating window. Different concentrations of poly (methyl methacrylate) (PMMA) particles were dispersed in aqueous glycerol solutions. The maximum coating speed could be extended with the addition of PMMA particles provided the dynamic wetting line was beneath the falling curtain, the so‐called “hydrodynamic assist.” The extension of the maximum coating speed was found to be strongly dependent on the particle number density. The onset of air entrainment was strongly dependent on the ability of direct contact of particles in the suspension with the air film on the moving substrate. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers

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Coupled fluid‐particle modeling of a slot die coating system

Akbarzadeh

Hrymak

2016

AIChE Journal

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This work seeks to develop a fundamental understanding of particle motion in the slot die coating process through studying the interaction of forces between particles, with the die walls and the fluid phase. Coupled computational fluid dynamics and the discrete element method is employed for evaluating the motion of individual suspended particles near moving surfaces in a complex three-dimensional flow field, motivated by the flow of particle laden fluid in a slot die coating system, including the presence of free surfaces. Overall, the particles follow the flow streamlines and their final position in the coating depends on the initial entry region of the particles. Particles experiencing adhesion with each other agglomerate in the low velocity regions of the coating gap, and have long residence times near the edge of the die at the end of the feed slot in the coating gap.

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Particle-assisted dynamic wetting in a suspension liquid jet impinged onto a moving solid at different flow rates

Cited by 9 publications

References 17 publications

Slot die coating of dilute suspensions

Slot die coating of dilute suspensions

Curtain coating of dilute suspensions

Coupled fluid‐particle modeling of a slot die coating system

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