Akademik Veri Yönetim Sistemi
HEAT TRANSFER RESEARCH, cilt.55, sa.6, ss.1-18, 2024 (SCI-Expanded)
In this study, the heat transfer performance with forced convection of two different water-based nanofluids was investigated by applying an alternating magnetic field in a minichannel. CoFe2O4-water and MnFe2O4-water nanofluids have been prepared at 0.5 vol.% and tested. The tests were carried out in a minichannel under laminar flow conditions in the Reynolds numbers range of 300-1700. Nusselt numbers of each fluid used in the experiments were calculated and compared. At the Reynolds number of 1500, the CoFe2O4-water nanofluid exhibited an increase of 12% compared to pure water, while the MnFe2O4-water nanofluid showed an increase of 4%. The Nusselt number increased in both nanofluids by applying the magnetic field to nanofluids. The highest Nusselt number obtained was 9.35 for the CoFe2O4-water nanofluid in the presence of magnetic field. While this increase was more pronounced at low Reynolds numbers, a lower rate of increase was obtained at high Reynolds numbers. In addition, the use of nanofluids significantly increased the pressure drop compared to the base fluid. While an almost 100% increase in the pressure drop was observed for the CoFe2O4-water nanofluid compared to pure water, the 65% increase for the MnFe2O4-water nanofluid was maximum. At the highest Reynolds numbers, the maximum pressure drops were determined as 3.4 kPa for the CoFe2O4-water nanofluid and 3 kPa for the MnFe2O4-water nanofluid. It was also detected that the friction factor for CoFe2O4-water and MnFe2O4-water nanofluids was 80% and 40% higher, respectively, than for the base fluid.