Flow and Heat Transfer of Turbulent Magnetic Fluid Flow in Long Magnetic Field Area

抄録

　Streamwise variation of flow field and heat transfer characteristics of turbulent magnetic fluid flow in magnetic field area was investigated experimentally. Ultrasonic velocity profiling (UVP) method was used to measure the velocity field and analyze the turbulent statistics. The test section is a rectangular duct, which has 18 mm × 18 mm of the cross section and 950 mm of the length. Magnetic field is applied to magnetic fluid flow in the perpendicular direction to the direction of heat flux. Streamwise length of the magnetic field area is 600 mm and magnetic field intensities are 50 mT and 130 mT. Reynolds number based on the hydraulic diameter is varied from 6500 to 9500. As a result of this study, the heat transfer is gradually suppressed from the entrance of the magnetic field area toward the downstream, and the suppression of heat transfer is saturated. Similar to the suppression of heat transfer, the Reynolds shear stress is also gradually suppressed toward the downstream of magnetic field area.