Computational Simulation of Heat Transfer Enhancement in Heat Exchanger using TiO₂ Nanofluid

Abstract

Convectional heat transfer is used extensively in many industrial heating and cooling systems. Small solid metal or metal-oxide nanoparticles floating in a base fluid increase heat transfer efficiency in a thermal system. This study used numerical modelling to investigate the transmission of the heat of a water-TiO₂ nanofluid forced convection turbulent flow in a circular tube with a uniform and continuous heat flux on the wall. Different turbulent models are examined in this simulation using Ansys Fluent CFD commercial software. The volume fraction of TiO₂ nanoparticles is 0.5% with Reynolds numbers varying from 7000 to 16000. According to modelling results, adding nanoparticles to a base fluid greatly improved convective heat transmission in a pipe, and the heat transfer enhancement improves as the Reynolds number rises. The K-epsilon turbulent model also beats the k-omega turbulent model in terms of accuracy, according to the findings.