Experimental Study on Convective Heat Transfer of Radial Air Flow in Rotating Multi-Channels Free

Experimental study on the convective heat transfer of radial air flow in rotating multi-channels was performed. Three sets of test sections, one single-flow passage, one nine-flow passages and one twenty-five-flow passages with the same cross sectional area of 9π mm², were applied to the experiments. The test section was formed by rectangular blocks of aluminum alloy with circular flow passages. Between two adjacent blocks, a Bakelite board of 1 mm thickness was placed to separate axial wall heat conduction for local heat transfer measurement. The parameters involved are the Reynolds number Re, the Rotation number Ro, the Buoyancy parameter Gr/Re², and the ratio of the heat transfer area A_p/A_c. The heat transfer results of radially rotating circular ducts based on per-passage and per-system were obtained.