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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal analysis of a low flow piezoelectric air pump
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Thermal analysis of a low flow piezoelectric air pump

机译：低流量压电气泵的热分析

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摘要

With the propagation of ever faster and more powerful electronics, the need for active, low power cooling is becoming apparent. In particular, applications which have traditionally relied only on natural convection will soon require an active cooling solution due to continually rising heat loads. A promising solution lies in utilizing piezoelectric materials via fans or pumps. Examples of such devices include synthetic jets and piezoelectric pumps, both of which rely on an oscillating diaphragm to induce flow. The device under investigation in this paper is able to generate flow rates up to 1 L/min and overcome pressures of over 2 kPa. The focus is to experimentally characterize the cooling potential of a piezoelectric-based air pump oriented normal to the heated element, an environment similar to jet impingement. Experimental characterizations were made through the use of a thin film heater which provided a constant heat flux while an infrared camera was used to capture the resulting temperature field of the heated surface. Full-field data of the convection coefficient was analyzed as a function of vibration amplitude of the piezoelectric diaphragm and distance from the nozzle to the heated target. The maximum heat transfer coefficient was found to always be at the stagnation point regardless of vibration amplitude or distance to the target. Correlations have been developed which account for both variables considered and can be used to predict the performance of future designs which rely on the same physical characteristics.
机译：随着越来越快，功能越来越强大的电子设备的普及，对有源低功耗冷却的需求日益明显。特别是，传统上仅依靠自然对流的应用由于热负荷不断上升，很快将需要主动的冷却解决方案。一种有前途的解决方案在于通过风扇或泵利用压电材料。这样的装置的例子包括合成射流和压电泵，两者都依靠振荡隔膜来引起流动。本文所研究的设备能够产生高达1 L / min的流速，并能克服超过2 kPa的压力。重点是通过实验表征垂直于加热元件定向的基于压电的空气泵的冷却电势，该环境类似于射流冲击。通过使用薄膜加热器进行实验表征，该薄膜加热器提供恒定的热通量，而红外摄像机用于捕获加热表面的温度场。对流系数的全场数据根据压电振动膜的振动幅度和从喷嘴到加热目标的距离进行分析。发现最大传热系数始终处于停滞点，而与振动幅度或距目标的距离无关。已经开发了相关性，这些相关性考虑了所考虑的两个变量，并且可以用来预测依赖于相同物理特性的未来设计的性能。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第10期|p.2461-2471|共11页
  • 作者

    Andrew Eastman; Mark Kimber; Atsuhiko Hirata; Gaku Kamitani;

  • 作者单位

    School of Mechanical Engineering and Materials Science, University of Pittsburgh, 648 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, USA;

    School of Mechanical Engineering and Materials Science, University of Pittsburgh, 648 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, USA;

    Micromechatronics Business Development Department, Murata Manufacturing Co., Ltd. Nagaokakyo-shi, Kyoto 617-8555, Japan;

    Micromechatronics Business Development Department, Murata Manufacturing Co., Ltd. Nagaokakyo-shi, Kyoto 617-8555, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    piezoelectric; impinging jets; heat transfer; low reynolds number;

    机译：压电;冲击射流;传热;低雷诺数;

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