Abstract
Effect of a uniform magnetic field on heat transfer in rectangular duct flow of a magnetic fluid was investigated experimentally. Experiment was performed with changing flow rate and magnetic field intensity. Magnetic field can be varied from 0 mT to 500 mT. The magnetic fluid used in this experiment is water-based magnetic fluid. Magnetic fluid in the rectangular duct is heated with uniform heat flux. 820, 1630 and 2450 for Reynolds number based on the hydraulic diameter was chosen. As a result of this experiment, in laminar flow, when the magnetic field is applied to magnetic fluid, heat transfer coefficient drastically increases locally in the region where magnetic field exists. This heat transfer coefficient becomes large with increasing magnetic field intensity and this increase of heat transfer coefficient is saturated. About 30 % of maximum increasing rate of heat transfer was obtained in the laminar flow of the magnetic fluid with applying magnetic field.
