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�������պ����ѧѧ�� 2006, Vol. 32 Issue (03) :284-287    DOI:
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Local heat transfer in a rotating U-shaped square channel with three channel orientations
Liu Chuankai, Tao Zhi, Ding Shuiting, Xu Guoqiang*
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� The influence of channel orientation on the local heat transfer coefficient in a rotating, U-shaped, square channel with smooth walls was investigated for rotation number from 0 to 0.26. The three channel orientations were square channel parallel to the rotation axis, square channel twisted at 22.5° to the rotation axis and square channel twisted at 45° to the rotation axis. A change in the channel orientation about the rotating frame causes a change in the secondary flow structure,consequently, the heat transfer coefficient from the individual surfaces of the channel changes. Results show that the Nusselt number difference between leading and trailing surfaces was reduced as the channel twisted to the rotation axis, however, the inner and outer surfaces show an increase in Nusselt number discrepancy over their corresponding parallel channel orientation values. Effect of channel orientation on heat transfer is relatively prominent for high rotation number.
Keywords�� gas turbines   cooling blades   convective heat transfer   serpentine passage   rotating     
Received 2005-04-01;
Fund:

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About author: ������(1979-),��,������������,��ʿ��, lckww@sina.com.
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������, ����, ��ˮ͡, ���ǿ.3��ת������תU�η�ͨ���ľֲ�����[J]  �������պ����ѧѧ��, 2006,V32(03): 284-287
Liu Chuankai, Tao Zhi, Ding Shuiting, Xu Guoqiang.Local heat transfer in a rotating U-shaped square channel with three channel orientations[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(03): 284-287
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