Entropy generation of a hybrid nanofluid on MHD mixed convection is a lid-driven cavity with partial heating having two rounded corners

Zakaria Korei,Smail Benissaad,F Bakir,S Kouidri,R Bennacer

doi:10.1051/e3sconf/202132102004

Abstract

This research aims to investigate thermal and flow behaviors and entropy generation of magnetohydrodynamic Al2O3-Cu/water hybrid nanofluid in a lid-driven cavity having two rounded corners. A solver based on C ++ object-oriented language was developed where the finite volume was used. Parameter’s analysis is provided by varying Reynolds numbers (Re), Hartmann numbers (Ha), the volume fraction of hybrid nanofluid (ϕ), radii of the rounded corners. The findings show that reducing the radii of the rounded corners minimizes the irreversibility. Furthermore, the thermal conductivity and dynamic viscosity of hybrid nanofluid contribute to increasing the irreversibility. Finally, the entropy generation is decreased by increasing the Hartman number and increases by rising the Reynolds number.

Highlights

In most practical applications, the driving force of convection is generally a combination of buoyancy and various applied forces, resulting in mixed convection
The thermal conductivity and dynamic viscosity of hybrid nanofluid contribute to increasing the irreversibility
We present the effect of different parameters: radii of the cavity’s corners, volume fraction, Hartmann number and Reynolds number; on streamlines, isotherms, Num and Sg

Summary

Introduction

The driving force of convection is generally a combination of buoyancy and various applied forces, resulting in mixed convection. Öztop et al [1] investigated mixed convection in a liddriven cavity having a wavy bottom wall using nanofluid in the presence of a magnetic field They observed that increasing the φ can lead to an improvement or reduction in heat transfer based on both numbers Ha and Ri. Khorasanizadeh et al [2] performed mixed convection in an enclosure filled with nanofluid (Cu-water). Selimefendigil et al [4] analyzed mixed convection in an enclosure using nanofluid where the domain divided diagonally, each one affected by inclined magnetic fields They observed that increasing Ha and Ri decrease the Sg. Mehrez et al [5] investigated heat transfer in an open cavity having backward-facing step using nanofluid. The effects of the radii of the rounded corners, volume fraction of hybrid nanofluid, Ha and Re are studied

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