Nanoparticles impacts on natural convection nanofluid flow and heat transfer inside a square cavity with fixed a circular obstacle

Abstract

Many significant applications may be acquired in specific nanoparticle shapes as well as size range or size. The shape of nano-sized particles is significant in every field of trace metal detection, for biomolecular assays, molecular labeling and the application of nanotechnology. The nanoparticle's shape effects are very noteworthy on the thermal conductivity of suspension. The main focus of the current study is to elaborate the nanoparticles shape impacts on nanofluid flow in a lid-driven square cavity with a fixed circular obstacle at the center. The top wall of the square cavity is adiabatic and moving. The circular cavity and bottom wall of the cavity is heated, while the remaining walls of the cavity are cold. The diamond-water nanofluid contained three kinds of nanoparticles shape namely Sphere, Column (nonspherical) and Lamina (nonspherical). The flow-modeled phenomena is governed in form of coupled partial differential equations and is tackled with finite element method (FEM). The flow distribution analysis is deliberated in form of streamlines, isothermal contour patterns, velocity distribution, temperature distribution, kinetic energy and Nusselt number. The graphical results indicate that the Lamina (nonspherical) shape nanoparticles have higher performance in (diamond-water) temperature distribution and heat transfer.