振动表面自然对流强化换热特性  

Heat transfer enhancement characteristics in nature convection along vibrant surface

作　　者：吴宏[1] 孟恒辉[1] 罗翔[1] 徐国强[1] 

机构地区：[1]北京航空航天大学航空发动机气动热力重点实验室,北京100083

出　　处：《北京航空航天大学学报》2008年第3期307-310,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：凡舟青年基金资助项目(20060402)

摘　　要：基于振动影响流动换热边界层发展的思路,通过实验方法对振动条件下的自然对流换热特性进行研究.实验采用电铃谐振器作为加热膜的激振源,并利用红外测温技术对表面温度场进行了测量.结果表明:振动对自然对流的强化可提高90.7%.在等热流密度条件下,振动能量越大,换热越好;在等振动能量条件下,热流密度越小,换热越强.研究结果为强化表面自然对流换热提供了一种新思路.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.

关 键 词：自然对流 振动 热流密度 努塞尔数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]