Magnetohydrodynamic Nanofluid Natural Convection in a Cavity under Thermal Radiation and Shape Factor of Nanoparticles Impacts: A Numerical Study Using CVFEM

Ali Chamkha,A.S Dogonchi,D.D Ganji

doi:10.3390/app8122396

Abstract

In this study, the natural convection of a magnetohydrodynamic nanofluid in an enclosure under the effects of thermal radiation and the shape factor of nanoparticles was analyzed numerically using the control-volume-based finite element method (CVFEM). Columns, spheres, and lamina are examples of the nanoparticle shapes used in the investigation. The study of nanofluid flow and heat transfer was accomplished with an extensive range of nanofluid volume fractions, radiation parameters, Hartmann numbers, Rayleigh numbers, and nanoparticle shape factors. Also, the correlation between the average Nusselt number and the influencing parameters of the current study was determined. The findings demonstrate that laminar nanoparticles have a more notable impact on the average and local Nusselt numbers than the other nanoparticle shapes.

Highlights

The inherently moderate thermal conductivity of regular fluids, such as water, oil, etc., causes a deterioration in the performance of engineering systems
A numerical study was carried out to analyze the influences of the Hartmann number (Ha = 0–50), Rayleigh number (Ra =, and ), radiation parameter (N = 1–3), volume fraction of the nanofluid (φ = 0–0.04), and shape factor (m = 3, 6.3698, and 16.1576) on magnetohydrodynamic nanofluid natural convection in a cavity
As shown by the increasing Ra, the stream function’s maximum absolute value increases; the flow moves more quickly in the cavity. This phenomenon is due to the intensity of the natural convection, which has a direct relationship with the stream function’s maximum absolute value

Summary

Introduction

The inherently moderate thermal conductivity of regular fluids, such as water, oil, etc., causes a deterioration in the performance of engineering systems. To overcome this barrier, researchers add metallic nanoscale particles—owing to the fact that they have a higher thermal conductivity than regular fluids—to these fluids. Entropy generation on a magnetohydrodynamic nanofluid toward a stagnation-point flow over a penetrable expanding wall was investigated by Bhatti and Rashidi [1]. They observed the increasing velocity of the fluid due to the pronounced effects of the magnetic field and the porosity parameter. They noted that the entropy generation number increased with increasing Brinkman number and Reynolds number

Methods

Results

Conclusion