Comparative Study on Oil-Based and Water-Based Hybrid Nanofluids with Stagnation-Point Flow Due to Variable Viscosity and Thermal Conductivity

Researchers recently developed hybrid nanofluids to address drawbacks of existing nanofluids, including clogging, low stability, high pressure drop, and expensive production. Here, viscosity and thermal conductivity vary with temperature, and by considering these variations, we can predict the flow behaviour. We consider the stretching sheet with an external magnetic field to conduct the flow. We convert the flow equations of momentum and heat transfer, which prevail in the present problem with boundary conditions, into nonlinear coupled ordinary differential equations using relevant similarity transformations.
Graphs illustrate and analyse how the non-dimensional parameter influences the velocity and temperature profiles. We compared the heat transfer rate for various values of the Prandtl number under some special assumptions with published research works and obtained satisfactory results in alignment with the papers. The results show that the heat transfer rate is sufficiently large for MWCNT-Alumina/engine oil hybrid nanofluid compared to MWCNT-Alumina/water hybrid nanofluid. Because of this, engineers and industry professionals can use MWCNT-Alumina/engine oil hybrid nanofluid as an efficient coolant

Variable viscosity, variable thermal conductivity, hybrid nanofluid velocity ratio parameter. 2010 Mathematics Subject Classification: 80A20

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