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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >AN EXPERINENTAL STUDY ON FORCED CONVECTION FROM A RECTANGULAR HEATED BLOCK BY ACOUSTIC EXCITATION IN A CHANNEL FLOW
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AN EXPERINENTAL STUDY ON FORCED CONVECTION FROM A RECTANGULAR HEATED BLOCK BY ACOUSTIC EXCITATION IN A CHANNEL FLOW

机译：声波激励在矩形加热块中强迫对流的实验研究

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摘要

An experimental study on forced convection from a heated block in a pulsating channel flow has been carried out. This problem is of particular interest in various thermal applications such as electronics cooling and industrial heat exchangers. A pulsating flow is imposed by an acoustic excitation at the channel inlet and a constant heat flux is given along the surfaces of the block. The impact of the important governing parameters such as the Reynolds number, the Strouhal number, and the pulsation amplitude on the heat transfer rate from the heated block is investigated in detail. The vortex shedding frequencies generated from the block are measured and the flow around the block is visualized by means of the particle visualization technique. The experimental results show that the inlet flow pulsation and the Reynolds number substantially affect thermal transport from the heated block. The heat transfer is dramatically enhanced at the frequencies of f_F=75Hz and f_F=150Hz. It is found by the flow visualization that this phenomenon is related to the intensified fluid mixing at the frequencies. The increase of the pulsation amplitude also significantly amplifies the heat transfer rate from the heated block.
机译：已经进行了在脉动通道流中来自加热块的强制对流的实验研究。在诸如电子冷却和工业换热器之类的各种热应用中，这个问题特别重要。通道入口处的声激发会产生脉动流，沿着模块的表面会产生恒定的热通量。详细研究了重要控制参数（如雷诺数，斯特劳哈尔数和脉动幅度）对加热块传热速率的影响。测量从块产生的涡旋脱落频率，并通过粒子可视化技术将块周围的流动可视化。实验结果表明，进口流量脉动和雷诺数实质上影响了加热块的热传递。在f_F = 75Hz和f_F = 150Hz的频率下，热传递得到了显着增强。通过流动可视化发现，该现象与频率上的强化流体混合有关。脉动幅度的增加还显着放大了来自加热块的传热速率。

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