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<p>This study presents a comprehensive hydrodynamic and transport analysis of the blade coating process involving shear-dependent non-Newtonian nanofluid. The model incorporates interfacial nonlinear slip, temperature-sensitive viscosity, Magnetohydrodynamics (MHD), and the coupled influences of Brownian motion and thermophoresis effects to capture realistic thin-film flow behavior and to improve coating uniformity in industrial applications. Lubrication Approximation Theory (LAT) simplifies mathematical governing expressions after non-dimensionalization and solved by numerical boundary value solver (bvp4c) alongwith fourth order Runge–Kutta method. The impact of non-Newtonian fluid rheology, velocity slip, viscosity variations, magnetic field, thermophoresis and Brownian motion on the heat transfer, uniform film thickness and blade load is discussed in detail. Findings reveal that Brownian motion enhances the temperature by 2% and substantially improves nanoparticle redistribution, homogenizing the concentration field. While thermophoresis drives nanoparticles toward cooler regions, resulting a 2% increase in temperature but leading to concentration depletion relative to normalized wall concentration at <i>y</i> = 1. While viscosity variations and shear-thinning behavior reduce coating thickness by 40.5% and 26.8%, the interplay of nanoparticle migration provides a mechanism for coating film stability. These results offer analytical guidance for the design and optimization of coating system under various operating conditions. Query ID="Q2" Text="Please check and confirm if the author names and initials are correct." </p>

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Influence of variable viscosity, nanoparticle migration and magnetohydrodynamics on thin-film formation in lubricating blade coating process of Sisko nanofluid

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Sabeeh Khaliq,
  • Zaheer Abbas,
  • Basma Souayeh,
  • Huda Alfannakh

摘要

This study presents a comprehensive hydrodynamic and transport analysis of the blade coating process involving shear-dependent non-Newtonian nanofluid. The model incorporates interfacial nonlinear slip, temperature-sensitive viscosity, Magnetohydrodynamics (MHD), and the coupled influences of Brownian motion and thermophoresis effects to capture realistic thin-film flow behavior and to improve coating uniformity in industrial applications. Lubrication Approximation Theory (LAT) simplifies mathematical governing expressions after non-dimensionalization and solved by numerical boundary value solver (bvp4c) alongwith fourth order Runge–Kutta method. The impact of non-Newtonian fluid rheology, velocity slip, viscosity variations, magnetic field, thermophoresis and Brownian motion on the heat transfer, uniform film thickness and blade load is discussed in detail. Findings reveal that Brownian motion enhances the temperature by 2% and substantially improves nanoparticle redistribution, homogenizing the concentration field. While thermophoresis drives nanoparticles toward cooler regions, resulting a 2% increase in temperature but leading to concentration depletion relative to normalized wall concentration at y = 1. While viscosity variations and shear-thinning behavior reduce coating thickness by 40.5% and 26.8%, the interplay of nanoparticle migration provides a mechanism for coating film stability. These results offer analytical guidance for the design and optimization of coating system under various operating conditions. Query ID="Q2" Text="Please check and confirm if the author names and initials are correct."