The Effects of Magnetic Nanofluid Flow with Different Heat Flux and Magnetic Field on Heat Transfer Through Horizontal Pipe

The influence of using nanoparticles with and without magnetic field on the characteristics of the flow and heat transfer rate is experimentally through a horizontal pipe. The base working fluid is distilled water, and the added nanoparticles are iron oxide (Fe3O4), with a volume fraction of (φ= 0.3, 0.6 and 0.9%). The intensity of the supplied magnetic field is (0.1 Tesla). The experiments are conducted at different heat fluxes (12.7, 15.9, 19.8 kW/m2), two different inlet temperatures (23, 45 oC), four different flow rates (2, 3, 3.5, 4, l/min) and range of Reynolds number (3930-7860). The results show that an increase in the concentration of nanofluids and heat flux give a boost in Nusselt number. Also, it is found that the use of a magnetic intensity enhances further heat transfer. The maximum enhancement in Nusselt number is about (18.3%) without using a magnetic field, and (20.1%) with the magnetic field, at a concentration of nanofluid of (φ = 0.9%) and lower heat flux