This work presents an experimental study of heat transfer and flow of Fe 3 O 4-distilled water at concentrations of field. All the tests are carried out with Reynolds number range (2900 W/m 2). The results show that, the nanofluid concentration and magnetic intensity increase, the Nusselt number increases. The maximum enhancement in Nusselt number with magnetic nanofluid is (5.4 %, 26.4 %, 42.7 %) for volume concentration (0.3, 0.6, 0.9 %) re 0.3 tesla) respectively to (43.9, 44.3, 46 %) with

more »

... lume concentration (0.9 %). The decreases with the increasing of Reynold number concentration increase and the intensity of magnet and decreases with increase of Reynold number.