Effects of superhydrophobicity and Lorentz force on <scp>MWCNT</scp> ‐ <scp> AL ₂ O ₃ </scp> ‐ <scp>CuO</scp> /(10:90) <scp>EG.W</scp> flow in a microtube with viscous dissipation

Abstract Advancements in the chemical engineering field, particularly in small‐scale processes, have led to an increasing demand for high‐performance heat‐dissipating microsystems. Thus, in the present study, a MWCNT‐Al 2 O 3 ‐CuO/(10:90) EG.W ternary hybrid nanoliquid flow in a microtube with viscous dissipation subjected to a constant wall heat flux is investigated numerically. The flow is under a uniform magnetic field with slip velocity at the wall due to wall superhydrophobicity. The set of governing equations and the corresponding boundary conditions were solved by using the finite volume method and the SIMPLER algorithm. The developed code was validated with experimental data from the literature. The main purpose of the present study is to explore the combined effects of Lorentz force and wall superhydrophobicity on the thermohydraulic performance and entropy generation of the ternary hybrid nanoliquid flow. Results showed that increasing the slip parameter enhances the convective heat transfer and decreases the pressure drop with a performance index greater than unity. All entropy production components decrease for high values of slip velocity, while the Bejan number shows opposite behaviour. Higher values of the Hartmann number make convective heat transfer and pressure drop increase with a performance index greater than unity. Magnetic, friction, and global entropy production components increase for high Hartmann values, while thermal entropy production and the Bejan number present opposite behaviour. More details on local and average variations of thermohydraulic performance and irreversibility components are presented and discussed.