Investigation of Ferro-nanofluid flow within a porous ribbed microchannel heat sink using single-phase and two-phase approaches in the presence of constant magnetic field

In this investigation, the entropy generation, heat transfer, and Fe3O4-water ferro-nanofluid flow within a porous ribbed microchannel heat sink in the presence of a constant magnetic field are investigated, and their impacts are analyzed for single-phase and two-phase approaches. The values of dimensionless numbers, namely Hartmann and the Reynolds numbers are in the range of 0 <= Ha <= 10 and 10 <= Re <= 80. Additionally, the porosity percentage and volume fraction of nanoparticles are in the range of 0 <= epsilon <= 75 % and 0 <= phi <= 2 %, respectively. The influences of dimensionless numbers and porosity percentage in three cases of the microchannel (Cases A.1, A.2, and A.3) are investigated. This study provides a comparison between assumed parameters. It is demonstrated that in all cases, variables such as porosity percentage, Reynolds and Hartmann numbers are directly related to the enhancement of the heat transfer coefficient. Also, in the single-phase model, the dimensionless heat transfer coefficient has a lower amount compared to the two-phase model, and the only exception is for phi = 0%. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study investigated the heat transfer, entropy generation, and flow of Fe3O4-water ferro-nanofluid within a porous ribbed microchannel heat sink in the presence of a constant magnetic field. Various dimensionless numbers and porosity percentages were considered to analyze the impacts on heat transfer performance. The results showed a direct relationship between factors such as porosity percentage, Reynolds number, and Hartmann number with the enhancement of the heat transfer coefficient.