Oscillating Electromagnetic Field Effect on Nusselt Number and Pressure Drop of Ferrofluid in the Fluted Tubes

Abstract

The heat transfer and friction factor of ferrofluid passing a helically fluted tube with a constant and oscillating electromagnetic field were experimentally investigated. The sixteen electromagnet units, the monitor system, and the Programmable Logic Controller (PLC) system comprise the electromagnetic field (EF) system. The use of Ferrosoferric oxide (Fe3O4) nanoparticles in this work is based on the excellent response to the electromagnetic field. An experiment with the corrugated tube had inside diameter, outside diameters, and length values of 1.02 cm, 1.27 cm, and 200 cm, respectively. The effect of the electromagnetic rotating direction, flux, frequency, and frequency on the heat removal capability and flow resistance have been considered. It can be seen that increasing the electromagnetic flux and frequency may significantly increase the heat-removal capacity. The average Nusselt number rises by 2.54 %, 5.32 %, and 12.32 % for the electromagnetic field 0.5 µT, 1.4 µT, and 20 µT, respectively, compared with the absent electromagnetic field. Moreover, the Brownian motion of particles greatly influences the electromagnetic rotation direction, power, and frequency, leading to increased heat transfer. The friction factor is also further increased by the disruption of electromagnetic flow. Despite this, the impact is not as significant as the augmentation of heat transport.