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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer analysis of nanofluid based microchannel heat sink
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Heat transfer analysis of nanofluid based microchannel heat sink

机译：基于纳米流体的微通道散热器的传热分析

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摘要

Heat generation in miniature electronic devices is a limiting factor that often adversely affects device performance. One prominent remedy for this problem is to adopt nanofluid based microchannel heat sinks embedded with pin fins. The performance of these heat sinks depends on their geometry and coolant properties. Aside from these geometrical aspects, there is a dearth of studies on the effects of nanoparticle properties on heat transfer enhancement. In this study, the effects of nanoparticle properties on heat removal performance are modeled using a nanofluid two-component model. It is shown that the nanoparticle distribution plays important roles in heat transfer, and, unlike homogeneous nanofluid models, the flow patterns in the system follow the nanoparticle distribution. Moreover, it is found that the influence of nanoparticles on heat transfer depends both on the pin size and the flow regime. While there is a monotonic dependency between the nanoparticle effect and the pin size at small Reynolds numbers, this effect is non-monotonic at high Reynolds numbers. Nanofluid viscosity is also shown to have adverse effects on heat transfer improvement, and the effect is more detrimental as the inertial forces increase. The particle size and surface energy are also found to change the whole picture of heat removal process due to particle agglomeration and deposition. Therefore, based on the nanoparticle properties, a characteristic curve is introduced, using which, nanoparticles can safely improve heat transfer.
机译：微型电子设备中的发热是通常会不利地影响设备性能的限制因素。解决此问题的一种重要方法是采用嵌入针状鳍片的基于纳米流体的微通道散热器。这些散热器的性能取决于其几何形状和冷却液性能。除了这些几何方面，还缺乏关于纳米颗粒性质对热传递增强的影响的研究。在这项研究中，使用纳米流体两组分模型来模拟纳米颗粒性质对散热性能的影响。结果表明，纳米颗粒的分布在传热中起着重要的作用，与均质纳米流体模型不同，系统中的流动模式遵循纳米颗粒的分布。而且，发现纳米颗粒对热传递的影响取决于销的尺寸和流动状态。虽然在小的雷诺数下纳米颗粒效应和销钉尺寸之间存在单调依赖性，但是在大的雷诺数下纳米颗粒效应与单峰效应是非单调的。纳米流体粘度还显示出对传热改善有不利影响，并且随着惯性力的增加，这种影响更加不利。还发现由于颗粒的团聚和沉积，颗粒大小和表面能改变了整个除热过程。因此，基于纳米颗粒的特性，引入了特性曲线，通过该特性曲线，纳米颗粒可以安全地改善传热。

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