Heat Transfer and Entropy Generation of Turbulent Flow in Corrugated Channel using Nanofluid

Abstract

This paper presents a numerical study of two-dimensional, turbulent flow with heat transfer in a corrugated channel using 3% of Al₂O₃ nanoparticles volume fraction dispersed in a basic fluid (water) with a particle diameter of 30nm. The equations governing the flow are: the energy equation to model heat transfer, the momentum equations and the continuity equation. To simulate different values ​​of the Reynolds number ranging from 1000 to 6000, the CFD code Ansys- Fluent based on the finite volume method is used. For turbulence modeling, the k-ε realizable model was used. The results are validated by other scientific work. Nu, skin friction coefficient, pressure drop and PEC factor are explored. We noted that the increase in the Reynolds number leads to an increase in the average Nusselt and a decrease in the coefficient of friction. Particular attention is paid to the generation of transfer entropy, friction and general entropy as well as the Bejan number. The transfer entropy generated in the fluid crossing the channel as well as the Bejan number decrease with the increase of the Reynolds while that of the friction increases. In addition, the use of nanofluid (Al₂O₃/water) gives better heat transfer than pure water.