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Analysis of Heat Transfer and Flow Characteristics for the Arrangement of Piezoelectric Fan on Heated Cylinder

机译：气缸上压电风扇布置的传热和流动特性分析

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摘要

Piezoelectric fans are an effective device for heat transfer enhancement in low convective regions due to their low power consumption, low noise, and operational simplicity. This study performs a numerical and experimental investigation into the effects of a piezoelectric fan on the velocity and temperature fields near a cylindrical heat source with a constant heat flux on the sidewalls and upper flat surface. In performing the investigation, the blade is placed at various locations along the cylindrical axis and is arranged such that it vibrates in either the vertical direction or the horizontal direction. The results show that the airstream induced by the vibrating fan covers a broader area of the heated surface when the blade vibrates in the vertical direction, and therefore yields a better heat transfer performance than that achieved when the fan vibrates in the horizontal direction. In addition, it is found that the maximum heat transfer augmentation ratio is obtained at dimensionless fan positions ranging from 0.6 to 0.75, and has values of 1.94, 1.53, and 1.44 given dimensionless fan tip clearances of 0.5, 1.0, and 1.5, respectively. Finally, it is shown that while the numerical results underestimate the effect of the vibrating piezoelectric fan in enhancing the heat transfer performance by around 1-14%, a good qualitative agreement is observed between the numerical and experimental results.
机译：压电风扇具有低功耗，低噪音和操作简单的特点，是增强低对流区域传热的有效设备。这项研究对压电风扇对圆柱形热源附近的速度和温度场的影响进行了数值和实验研究，圆柱形热源在侧壁和上平坦表面上具有恒定的热通量。在进行研究时，将叶片沿圆柱轴放置在各个位置，并且将叶片布置成使其在垂直方向或水平方向上振动。结果表明，当叶片在垂直方向上振动时，由振动风扇引起的气流覆盖较宽的受热表面区域，因此与在水平方向上振动时相比，传热性能更好。此外，发现在无因次风扇位置范围为0.6到0.75的情况下，可获得最大的传热增加率，在无因次风扇尖端间隙分别为0.5、1.0和1.5的情况下，其传热系数为1.94、1.53和1.44。最后，结果表明，虽然数值结果低估了振动压电风扇在提高传热性能方面的效果，但其数值和实验结果之间存在良好的定性一致性。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1525-1539|共15页
  • 作者

    CHIEN-NAN LIN; JIN-SHENG LEU;

  • 作者单位

    Department of Mechanical Engineering, Far East University, Tainan, Taiwan,Far East University, No. 49, Zhonghua Rd., Xinshi Dist., Tainan City 74448, Taiwan;

    Department of Mechanical Engineering, Air Force Institute of Technology, Kaohsiung, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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