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�������պ����ѧѧ�� 2008, Vol. 34 Issue (03) :307-310    DOI:
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Heat transfer enhancement characteristics in nature convection along vibrant surface
Wu Hong, Meng Henghui, Luo Xiang, Xu Guoqiang*
National Key Laboratory on Aero-Engines, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Based on the idea that vibrations can destroy flow and heat boundary layer, which is the main thermal resistance for heat transfer, an experiment was investigated to study the heat transfer characteristics specialty of vibrant surface in natural convection, and to get the relationship between vibration and heat transfer. The electrical bell was used as the vibration source of the heated diaphragm. Infrared thermometer was adopted to measure the temperature field on the vibrant surface, and the temperature distribution with post treatment was gotten. Experiment results show that the effect of heat transfer on the vibrant surface is increased by 90.7% under the working condition. The increasing energy of the vibration can increase the heat transfer coefficient under the constant heat flux condition, while the decreasing heat flux can improve the heat transfer coefficient under the equal vibration energy condition. The results bring a new method for the application of enhancing heat transfer in nature convection.
Keywords�� natural convection   vibrations   heat flux   Nusselt number     
Received 2007-06-29;


About author: �� ��(1971-),��,�����ֳ���,������,wuhong@buaa.edu.cn.
���,�Ϻ��,����,���ǿ.�񶯱�����Ȼ����ǿ����������[J]  �������պ����ѧѧ��, 2008,V34(03): 307-310
Wu Hong, Meng Henghui, Luo Xiang, Xu Guoqiang.Heat transfer enhancement characteristics in nature convection along vibrant surface[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(03): 307-310
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