MHD Hybrid Nanofluid Mixed Convection Heat Transfer and Entropy Generation in a 3-D Triangular Porous Cavity with Zigzag Wall and Rotating Cylinder

Aissa Abderrahmane,Nehad Ali Shah,Jae Dong Chung,Naef A A Qasem,Riadh Marzouki,Abed Mourad,Obai Younis

doi:10.3390/math10050769

Abstract

The purpose of this work was to conduct a numerical examination of mixed convective heat transfer in a three-dimensional triangular enclosure with a revolving circular cylinder in the cavity’s center. Numerical simulations of the hybrid Fe3O4/MWCNT-water nanofluid are performed using the finite element approach (FEM). The simulation is carried out for a range of parameter values, including the Darcy number (between 10−5 and 10−2), the Hartmann number (between 0 and 100), the angular speed of the rotation (between −500 and 1000), and the number of zigzags. The stream function, isotherms, and isentropic contours illustrate the impact of many parameters on motion, heat transfer, and entropy formation. The findings indicate that for enhancing the heat transfer rates of hybrid nanofluid in a three-dimensional triangular porous cavity fitted with a rotating cylinder and subjected to a magnetic field, Darcy number > 10−3, Hartmann number < 0, one zigzag on the hot surface, and rotation speed >500 in flow direction are recommended.

Highlights

Nanofluids are a unique type of artificial fluid that incorporate nanoparticles
To understand the thermal-hydraulic characteristics of a nanofluid’s flow in an enclosure, the following results in terms of 3-D surface plots are devoted to showing a complete picture about the thermal-hydraulic visualization inside the investigated cavity
Due to the zigzag feature at the hot surface, the streamlines are less smooth in the left region of the cavity compared to those closer to the colder surface—two primary vortices are generated around the cylinder

Summary

Introduction

Nanofluids are a unique type of artificial fluid that incorporate nanoparticles. The unique and original properties of nanofluids that encourage us to use it instead of ordinary liquids as a coolant are its greater thermal conductivity and enhanced heat transmission capabilities. Solar receivers, petroleum exploration, chemical engineering, electronics cooling, mechanical engineering, and solar collectors are just a few of the key technologies that can utilize nanofluids to improve their performance [1–3]. Suspending nanoparticles in traditional working fluids has been shown to boost heat transfer rates by growing thermal conductivity. The magnitude of the increment in heat transmission stated in the literature varies greatly. Numerous research articles (both experimental and computational) on application of nanofluids in various fields have been published [4–8]

Objectives

Methods

Results

Conclusion