Blade coating analysis of viscous nanofluid having Cu–water nanoparticles using flexible blade coater

Kanwal, Marya; Wang, Xinhua; Shahzad, Hasan; Chen, Ying‐Chun; Chai, Hui

doi:10.1177/8756087920910480

Cited by 7 publications

(7 citation statements)

References 40 publications

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“…Khaliq and Abbas [23] presented the Cu-water nanoparticles suspended in a Newtonian fluid to observe the roll coating process on a porous web. Then, flexible blade coater was investigated by Kanwal et al [24] using the same nanofluid model to debate the blade coating analysis. Viscous nanofluid was discussed by Abbas and Khaliq [25] in their investigation of the calendering process to analyze the influence of Cu-nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Variation of coating thickness in blade coating process of an upper-convected Jeffery’s fluid model

Abbas

Khaliq

2021

Iran Polym J

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The coating process is significant in terms of its practical applications in the field of paint and electronics industries. The coating process offers a protective layer in paints; however, it stores information in electronics industries. Current study gives insight on the blade coating analysis by passing an upper convected Jeffery's material through the narrow gap between the moving substrate and a fixed blade. The basic flow expressions were simplified by utilizing lubrication approximation theory, and then solved using the perturbation analysis and numerical shooting technique. The study discussed the effects of material parameters in both cases of plane and exponential coaters. The variations of Weissenberg number, viscosities ratio and normalized coating thickness on the maximum pressure, pressure gradient, coating thickness, pressure, and load are presented through graphs and in a tabular manner. In addition, the perturbation results were validated by comparing with the numerical outcomes and found an excellent agreement. It is noted that increasing both the Weissenberg number and viscosities ratio resulted in reduced coating thickness and increased blade load, hence were the controlling parameters, as they certified the coating quality and life of the substrate. Besides, the parameters had significant impacts on the velocity and pressure profiles. In addition, maximum pressure was directly proportional to the Weissenberg number and viscosities ratio.

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Section: Introductionmentioning

confidence: 99%

Variation of coating thickness in blade coating process of an upper-convected Jeffery’s fluid model

Abbas

Khaliq

2021

Iran Polym J

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“…They determined that the fluid velocity and blade deflection are controllable factors under the existence of magnetic field and slip. Kanwal et al [24] employed LAT for the solution of governing flow equations by using viscous nanofluid, which consists of copper nanoparticles, with a porous substrate, in this case, a flexible blade coater is used for the analysis. They adopted two distinct models that may differ in dynamics viscosities.…”

Section: Introductionmentioning

confidence: 99%

Study of Slip Effects in Reverse Roll Coating Process Using Non-Isothermal Couple Stress Fluid

et al. 2021

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The non-isothermal couple stress fluid inside a reverse roll coating geometry is considered. The slip condition is considered at the surfaces of the rolls. To develop the flow equations, the mathematical modelling is performed using conservation of momentum, mass, and energy. The LAT (lubrication approximation theory) is employed to simplify the equations. The closed form solution for velocity, temperature, and pressure gradient is obtained. While the pressure and flow rate are obtained numerically. The impact of involved parameters on important physical quantities such as temperature, pressure, and pressure gradient are elaborated through graphs and in tabular form. The pressure and pressure gradient decreases for variation of the couple stress parameter and velocity ratio parameter K. While the variation of the slip parameter increases the pressure and pressure gradient inside the flow geometry. Additionally, flow rate decreases for the variation of the slip parameter as fluid starts moving rapidly along the roller surface. The most important physical quantity which is responsible for maintaining the quality of the coating and thickness is flow rate. For variation of both the couple stress parameter and the slip parameter, the flow rate decreases compared to the Newtonian case, consequently the coating thickness decreases for the variation of the discussed parameter.

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“…LAT was used to simplify the involved equations. Kanwal et al 19 also examined a flexible blade coater with a viscous nanofluid and using a porous substrate by taking two distinct models for dynamics viscosities. LAT is utilized to simplify the flow equations.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of Johnson-Segalman fluid in blade coating process

Kanwal

Wang

Shahzad

et al. 2021

Journal of Plastic Film & Sheeting

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This article deals with the blade coating process for Johnson-Segalman (JS) fluid using plane coater. Flow equations are simplified with the Lubrication approximation theory (LAT). The equations are normalized using suitable scales. Reduced equations are solved numerically using the shooting technique. Also, for small Weissenberg numbers, a perturbation solution is obtained. How Weissenberg number and slip parameter influence the pressure gradient, velocity, pressure, load, and thickness are expressed graphically and via table. In the present work, load on the blade is crucial as it controls the thickness quality. One observes that an increased Weissenberg number decreases load, while the coating thickness increases when compared to the viscous case.

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Blade coating analysis of viscous nanofluid having Cu–water nanoparticles using flexible blade coater

Cited by 7 publications

References 40 publications

Variation of coating thickness in blade coating process of an upper-convected Jeffery’s fluid model

Variation of coating thickness in blade coating process of an upper-convected Jeffery’s fluid model

Study of Slip Effects in Reverse Roll Coating Process Using Non-Isothermal Couple Stress Fluid

Mathematical modeling of Johnson-Segalman fluid in blade coating process

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