Heat Transfer in Rotating Channel With Inclined Pin-Fins

Abstract

This study is to examine experimentally the effects of pin inclination and pin height-to-diameter ratio on the heat/mass transfer characteristics in a pin-fin channel with and without rotation. The test model consists of staggered pin-fin arrays with an interpin spacing of 2.5 times of the pin-diameter (S/D=2.5) in both longitudinal and transverse directions. Detailed local heat/mass transfer coefficients on the two principal surfaces of rotating channel are measured using the naphthalene sublimation technique. The inclined angles (θ) studied are 60 deg and 90 deg. The pin height-to-diameter ratio (Hp/Dp) ranges from 2 to 4. The Reynolds number is fixed at 7.0×103 with two rotation numbers (0.0 and 0.2). The measured data show that the overall array heat/mass transfer decreases with the angle of inclination relative to the vertical orientation. The overall array averaged as well as the row-resolved heat/mass transfer increases with an increase in Hp/Dp. Rotation generally results in higher heat/mass transfer than the corresponding stationary case. The nonuniformity or redistribution of heat/mass transfer induced by the Coriolis force generally perceived in a ribbed or smooth channel is less evident in a pin-fin channel.