Effect of Channel Orientation on Heat Transfer in Rotating Rectangular Channel (AR=4) with 90º Rib Turbulators
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2016 by IJETT Journal|
|Year of Publication : 2016|
|Authors : Jalal M. Jalil, Fouad A. Saleh, and Sa'ib A. Hamid Al-Jubury
|DOI : 10.14445/22315381/IJETT-V32P222|
Jalal M. Jalil, Fouad A. Saleh, Sa'ib A. Hamid Al-Jubury"Effect of Channel Orientation on Heat Transfer in Rotating Rectangular Channel (AR=4) with 90º Rib Turbulators", International Journal of Engineering Trends and Technology (IJETT), V32(3),124-128 February 2016. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
An experimental investigation to determine the effect of the channel orientation on heat transfer enhancement in stationary and rotating rectangular channel of constant aspect ratio (AR=4) with facing 90º rib turbulators. A Reynolds number range tested in this study was 8000-13500. The effect of channel orientations of β=90 deg and 135 deg with respect to the plane of rotation is investigated and the rotation effect is also studied, where the rotational velocity is fixed at 500 rpm. The results show that the higher heat transfer enhancement for channel at 135º by 2.7 to 2.2 times while was 2.5 to 2 times for β=90º for stationary case. But for rotational cases the heat transfer enhancement was 3.4 to 2.6 and 2.8 to 2.3 for β=135º and β=90º, respectively for Reynolds number range 8000 to 13500, comparing with smooth non rotating pipe adopted by Dittus-Boelter/McAdams. Also the results show that the average percentage of heat transfer enhancement of duct at β=135º was 3% higher than duct at β=90º for stationary case while for rotating case was 12% for the range of Reynolds number tested in this work.
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Enhancement, Heat transfer, Rotating, channel orientation, Turbines cooling.