Convection Heat transfer Fe3O4/Water in a Square microchannel Under Uniform Heat Flux and Magnetic Field

Document Type : Research Article

Authors

1 Faculty of mechanical engineering, Shahrood university of technology, Shahrood, Iran

2 Professor, Faculty of mechanical Engineering, Shahrood University of Technology, Shahrood, Iran

Abstract

This study aimed to investigate the heat transfer of water/Fe3O4 nanofluid in a square cross-sectional channel with dimensions of 80 cm ⨯1 cm ⨯1 cm under the influence of a uniform heat flux perpendicular to the laminar flow of ferrofluid in the presence of a magnetic field. Firstly, the production of ferrofluid with concentrations of 0.5 vol.% and 1vol.%, their quality, and the quality of the production method was investigated. The results of zeta potential and vibrating-sample magnetometer tests show the good quality and stability of the produced ferrofluid. The thermophysical properties of the made ferrofluid are compared and evaluated with existing experimental correlations. The heat transfer of the produced ferrofluids under the influence of heat fluxes of 134-546 Watts is investigated in the absence of an external magnetic field. Then, the effect of the external magnetic field on the heat transfer at 0.5 vol.%, under the influence of a total heat flux of 1258.2 Watts is investigated. The magnitude of increase of heat transfer coefficient compared to pure water, without external field, for ferrofluid with 1 vol.%, under total heat fluxes of 134, 545, and 321.3 Watts, are 30%, 48%, and 38% respectively. At a heat flux of 1258.2 Watts, the heat transfer coefficient in the presence of an external magnetic field increases by 3.16% at 0.5 vol.% compared to the absence of a magnetic field.

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Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 9
December 2021
Pages 4925-4942

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