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首页> 外文期刊>International Journal of Heat and Fluid Flow >Two-phase flow instabilities in a silicon microchannels heat sink
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Two-phase flow instabilities in a silicon microchannels heat sink

机译：硅微通道散热器中的两相流不稳定性

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摘要

Two-phase flow instabilities are highly undesirable in microchannels-based heat sinks as they can lead to temperature oscillations with high amplitudes, premature critical heat flux and mechanical vibrations. This work is an experimental study of boiling instabilities in a microchannel silicon heat sink with 40 parallel rectangular microchannels, having a length of 15 mm and a hydraulic diameter of 194 μm A series of experiments have been carried out to investigate pressure and temperature oscillations during the flow boiling instabilities under uniform heating, using water as a cooling liquid. Thin nickel film thermometers, integrated on the back side of a heat sink with microchannels, were used in order to obtain a better insight related to temperature fluctuations caused by two-phase flow instabilities. Flow regime maps are presented for two inlet water temperatures, showing stable and unstable flow regimes, it was observed that boiling leads to asymmetrical flow distribution within microchannels that result in high temperature non-uniformity and the simultaneously existence of different flow regimes along the transverse direction. Two types of two-phase flow instabilities with appreciable pressure and temperature fluctuations were observed, that depended on the heat to mass flux ratio and inlet water temperature. These were high amplitude/low frequency and low amplitude/high frequency instabilities. High speed camera imaging, performed simultaneously with pressure and temperature measurements, showed that inlet/outlet pressure and the temperature fluctuations existed due to alternation between liquid/two-phase/vapour flows. It was also determined that the inlet water subcooling condition affects the magnitudes of the temperature oscillations in two-phase flow instabilities and flow distribution within the microchannels.
机译：两相流不稳定性在基于微通道的散热器中是非常不希望的，因为它们会导致高幅度的温度振荡，过早的临界热通量和机械振动。这项工作是对具有40个平行矩形微通道，长度为15 mm，水力直径为194μm的微通道硅散热器中沸腾不稳定性的实验研究。已经进行了一系列实验来研究在冷却过程中压力和温度的波动。以水为冷却液，在均匀加热下的流动沸腾不稳定性。为了获得与由两相流不稳定性引起的温度波动有关的更好的见解，使用了集成在带有微通道的散热器背面的镍薄膜温度计。给出了两个进水温度的流态图，显示了稳定和不稳定的流态，观察到沸腾导致微通道内的流量分布不对称，从而导致高温不均匀，并且沿横向同时存在不同的流态。观察到两种类型的两相流不稳定性，它们具有明显的压力和温度波动，这取决于热质通量比和进水温度。这些是高振幅/低频和低振幅/高频不稳定性。与压力和温度测量同时进行的高速相机成像显示，由于液体/两相/蒸气流之间的交替，存在入口/出口压力和温度波动。还确定了进水过冷条件会影响两相流不稳定性中的温度振荡幅度以及微通道内的流分布。

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  • 来源
    《International Journal of Heat and Fluid Flow》 |2009年第5期|854-867|共14页
  • 作者

    D. Bogojevic; K. Sefiane; A.J. Walton; H. Lin; G. Cummins;

  • 作者单位

    School of Engineering, University of Edinburgh, Mayfield Road, King's Buildings, EH9 3JL Edinburgh, UK;

    School of Engineering, University of Edinburgh, Mayfield Road, King's Buildings, EH9 3JL Edinburgh, UK;

    Scottish Microelectronic Centre, Joint Research Institute for Integrated Systems, School of Engineering, The University of Edinburgh, EH9 3JF, UK;

    Scottish Microelectronic Centre, Joint Research Institute for Integrated Systems, School of Engineering, The University of Edinburgh, EH9 3JF, UK;

    Scottish Microelectronic Centre, Joint Research Institute for Integrated Systems, School of Engineering, The University of Edinburgh, EH9 3JF, UK;

  • 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

    microchannels; two-phase flow boiling; instability; silicon heat sinks; microsensors;

    机译：微通道;两相流沸腾;不稳定硅散热器;微传感器;

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