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<p>This study examines the rotational magnetohydrodynamic (MHD) flow of Casson–Williamson double-diffusive engine-oil-based molybdenum disulfide (MoS<sub>2</sub>) nanofluid over a slanted stretching sheet focusing on the combined effects of heat generation, Joule heating, and Hall currents. The mathematical model also incorporates the viscous dissipation, chemical reactions, Soret and Dufour effects. The governing partial differential equations are transformed into ordinary differential equations using similarity variables and are then tackled numerically via the spectral relaxation method (SRM). The performance of velocity, temperature, and concentration fields is evaluated by the graphical depictions in relation to the pertinent parameters, whereas the engineering quantities by tabular presentations. We found that the strong magnetic influence and mixed convection parameters caused to decrease both primary and secondary velocities. The primary velocity slowed down due to the rotational and Hall effects, while the secondary velocity was exposed an opposite trend. The strong buoyancy forces in the flow was prompted to hasten the primary flow. The temperature field was considerably magnified by thermophoresis, magnetic field, viscous dissipation, heat source, and higher nanoparticle concentration effects. Likewise, the concentration field was enlarged by the thermophoresis, but it decays with chemical reaction influence. Both primary and secondary skin frictions were decreased by the Brownian motion, magnetic field, thermophoresis and Hall effects, whereas both raised by mixed convection parameter. The effects of thermophoresis, magnetic and Brownian motion were incited to rise the Nusselt number, but it was decreased by heat source and Hall influences. Further, heat transfer rate was approximately raised up to 0.73% when dispersing 4% of MoS<sub>2</sub> nanoparticle into the base-fluid (engine oil).</p>

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Optimized double-diffusive heat transfer of engine-oil-based MoS2 Casson–Williamson nanofluid flow with Hall and rotational impacts over inclined stretching sheet

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Paul M. Matao,
  • Jumanne Mng’ang’a,
  • B. Prabhakar Reddy

摘要

This study examines the rotational magnetohydrodynamic (MHD) flow of Casson–Williamson double-diffusive engine-oil-based molybdenum disulfide (MoS2) nanofluid over a slanted stretching sheet focusing on the combined effects of heat generation, Joule heating, and Hall currents. The mathematical model also incorporates the viscous dissipation, chemical reactions, Soret and Dufour effects. The governing partial differential equations are transformed into ordinary differential equations using similarity variables and are then tackled numerically via the spectral relaxation method (SRM). The performance of velocity, temperature, and concentration fields is evaluated by the graphical depictions in relation to the pertinent parameters, whereas the engineering quantities by tabular presentations. We found that the strong magnetic influence and mixed convection parameters caused to decrease both primary and secondary velocities. The primary velocity slowed down due to the rotational and Hall effects, while the secondary velocity was exposed an opposite trend. The strong buoyancy forces in the flow was prompted to hasten the primary flow. The temperature field was considerably magnified by thermophoresis, magnetic field, viscous dissipation, heat source, and higher nanoparticle concentration effects. Likewise, the concentration field was enlarged by the thermophoresis, but it decays with chemical reaction influence. Both primary and secondary skin frictions were decreased by the Brownian motion, magnetic field, thermophoresis and Hall effects, whereas both raised by mixed convection parameter. The effects of thermophoresis, magnetic and Brownian motion were incited to rise the Nusselt number, but it was decreased by heat source and Hall influences. Further, heat transfer rate was approximately raised up to 0.73% when dispersing 4% of MoS2 nanoparticle into the base-fluid (engine oil).