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<p>It is commonly known that fluids behave differently depending on the application. Couple stress, which is related to the fluid’s internal tensions, is one of its most important and distinguishing properties. This characteristic is essential for modeling fluid flow in microchannels, where elevated shear rates distinguish the flow. Hence, this study offers a numerical investigation of convective heat transfer in a couple stress alloys/methanol (AA7072-AA7075/CH<sub>3</sub>OH) hybrid nanofluid. Similarity transformations are applied to convert the governing partial differential equations into a system of ordinary differential equations and solved using MATLAB’s bvp4c function. The result shows that the presence of couple stress effects and hybrid nanoparticles has a significant impact on both velocity and temperature distributions. It is observed that larger values of the couple stress parameter decrease skin friction and increase the thickness of the thermal boundary layer. Moreover, the suction parameter is also crucial in enhancing the heat by reducing boundary layer thickness, thereby increasing the local Nusselt number. However, higher concentrations of the nanoparticles produce larger viscosity which may diminish the efficiency of convective heat transfer. The results offer valuable insights into optimizing hybrid nanofluid properties for complex thermal management systems, such as cooling systems and energy devices.</p>

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Mixed convection of couple stress hybrid nanofluid past a vertical shrinking plate

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Nurul Amira Zainal,
  • Dg Marina Mokhtar,
  • Iskandar Waini,
  • Haris Alam Zuberi,
  • Roslinda Nazar,
  • Ioan Pop

摘要

It is commonly known that fluids behave differently depending on the application. Couple stress, which is related to the fluid’s internal tensions, is one of its most important and distinguishing properties. This characteristic is essential for modeling fluid flow in microchannels, where elevated shear rates distinguish the flow. Hence, this study offers a numerical investigation of convective heat transfer in a couple stress alloys/methanol (AA7072-AA7075/CH3OH) hybrid nanofluid. Similarity transformations are applied to convert the governing partial differential equations into a system of ordinary differential equations and solved using MATLAB’s bvp4c function. The result shows that the presence of couple stress effects and hybrid nanoparticles has a significant impact on both velocity and temperature distributions. It is observed that larger values of the couple stress parameter decrease skin friction and increase the thickness of the thermal boundary layer. Moreover, the suction parameter is also crucial in enhancing the heat by reducing boundary layer thickness, thereby increasing the local Nusselt number. However, higher concentrations of the nanoparticles produce larger viscosity which may diminish the efficiency of convective heat transfer. The results offer valuable insights into optimizing hybrid nanofluid properties for complex thermal management systems, such as cooling systems and energy devices.