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�������պ����ѧѧ�� 2009, Vol. 35 Issue (1) :18-22    DOI:
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�콣��, ���ǿ, �� ��, ��ˮ͡*
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Numerical investigation of heat transfer and flow resistance in U-shaped variable cross-section channels with different rib heights
Zhu Jianqin, Xu Guoqiang, Tao Zhi, Ding Shuiting,*
National Key Laboratory on Aero-Engines, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� The flow and temperature distribution in U-shaped variable cross-section channels with different rib heights was investigated numerically by a new developed three-dimensional Navier-Stokes code with low Reynolds number ��k-� turbulence model. The rib pitch is 25�omm and the rib heights are 1�omm,1.5�omm,2�omm respectively. The Reynolds number ��Re�� based on the inlet velocity of the cooling air and hydraulic diameter are 7�o500,12�o500,18�o500,25�o000. Numerical results reveal that the average Nusselt number of the channel increases with the increase of Reynolds number. The enhanced heat transfer was achieved with the higher rib height e when Re is equal to 7�o500 and 12�o500. The higher heat transfer characteristics can be reached for the case of e =1.5�omm when Re is equal to 18�o500 and 25�o000. The effects of rib heights on local heat transfer show different behavior due to the different local Reynolds numbers and centrifugal force. The higher rib height e enhanced the heat transfer of inflow passage. In outflow passage, the higher the rib height, the better heat transfer behavior is produced for Re =7�o500 and 12�o500, while for Re =18�o500 and 25�o000 the optimum rib height is 1.5�omm.
Keywords�� channel flow   heat transfer   simulation     
Received 2008-01-04;
About author: �콣��(1983-),Ů,���Ϻ�����,��ʿ��,zhujianqinbuaa@sina.com.
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�콣��, ���ǿ, �� ��, ��ˮ͡.���߱�����תͨ���������뻻�ȵ���ֵģ��[J]  �������պ����ѧѧ��, 2009,V35(1): 18-22
Zhu Jianqin, Xu Guoqiang, Tao Zhi, Ding Shuiting, .Numerical investigation of heat transfer and flow resistance in U-shaped variable cross-section channels with different rib heights[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(1): 18-22
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