The effect of magnetic field applied nanofluid on thermal performance in a horizontal tube

Energy is defined as the ability to do work in the shortest terms. The universe came into being with a huge energy explosion and today, the continuation of life is possible with the existence of energy. Today, it is thought that the world population has exceeded 8 billion. Since the past, the unconscious use of energy resources, the low efficiency of technological systems and the increase in the population, parallel to the rapid depletion of energy resources. Therefore, scientists are conducting research to increase the efficiency of existing energy systems every day. Improving the efficiency of heat transfer systems is important in the researches carried out. It is desired to decrease the energy to be used by increasing the heat transfer rate in the systems. In thermal systems, oil, water or ethylene glycol are generally used as the basic fluid and the thermal performances of these fluids reach a certain level. Many studies are being carried out to improve the heat transfer rate. Nanofluids are at the forefront of the studies carried out in this field. It is aimed to increase heat transfer by using nanofluids in heat transfer systems. Many studies and experiments are being carried out in this field. The effect of different types of nanofluids on thermal performance is being investigated. In this experimental study, the thermal performance of iron oxide-water magnetic nanofluid applied with magnetic field was investigated under constant heat capacity. A total of four different fluid types (pure water, 0.5% iron oxide-water nanofluid, 1.0% iron oxide-water nanofluid, 1.5% iron oxide-water nanofluid), two different flow rates (10x10-5 m3/s and 13x10-5 m3/s), two different constant heat capacities (25000 W/m2 and 50000 W/m2) were investigated first without the effect of magnetic field and then under the effect of magnetic field. A total of 28 different experiments were carried out. Each experiment was repeated twice and the results were checked. During the experiments, care was taken to keep the inlet temperature and the external ambient temperature of the fluids as equal as possible. According to the experimental data, the thermal performance results obtained are as follows; the Nusselt number of 1.5% iron oxide-water nanofluid increased by 38% at 25000 W/m2 heat flux at Re=4350, by 40.3% at 25000 W/m2 heat flux at Re=5750, by 40% at 50000 W/m2 heat flux at Re=4350, and by 44% at 50000 W/m2 heat flux at Re=5750, compared to pure water.