TY - JOUR
TI - Heat transfer and flow region characteristics study in a non-annular channel between rotor and stator
AU - Nili-Ahmadabadi Mahdi
AU - Karrabi Hadi
JN - Thermal Science
PY - 2012
VL - 16
IS - 2
SP - 593
EP - 603
PT - Article
AB - This paper will present the results of the experimental investigation of heat  transfer in a non-annular channel between rotor and stator similar to a real  generator. Numerous experiments and numerical studies have examined flow and  heat transfer characteristics of a fluid in an annulus with a rotating inner  cylinder. In the current study, turbulent flow region and heat transfer  characteristics have been studied in the air gap between the rotor and  stator of a generator. The test rig has been built in a way which shows a  very good agreement with the geometry of a real generator. The boundary  condition supplies a non-homogenous heat flux through the passing air  channel. The experimental devices and data acquisition method are carefully  described in the paper. Surface-mounted thermocouples are located on the  both stator and rotor surfaces and one slip ring transfers the collected  temperature from rotor to the instrument display. The rotational speed of  rotor is fixed at three under: 300rpm, 900 rpm and 1500 rpm. Based on these  speeds and hydraulic diameter of the air gap, the Reynolds number has been  considered in the range: 4000  Keywords: heat transfer, turbulent flow, forced convection, effective reynolds, experimental study