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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer enhancement in microchannel heat sinks using nanofluids
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Heat transfer enhancement in microchannel heat sinks using nanofluids

机译：使用纳米流体增强微通道散热器的传热

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摘要

Heat transfer enhancement in a 3-D microchannel heat sink (MCHS) using nanofluids is investigated by a numerical study. The addition of nanoparticles to the coolant fluid changes its thermophysical properties in ways that are closely related to the type of nanoparticle, base fluid, particle volume fraction, particle size, and pumping power. The calculations in this work suggest that the best heat transfer enhancement can be obtained by using a system with an Al_2O_3-water nanofluid-cooled MCHS. Moreover, using base fluids with lower dynamic viscosity (such as water) and substrate materials with high thermal conductivity enhance the thermal performance of the MCHS. The results also show that as the particle volume fraction of the nanofluid increases, the thermal resistance first decreases and then increases. The lowest thermal resistance can be obtained by properly adjusting the volume fraction and pumping power under given geometric conditions. For a moderate range of particle sizes, the MCHS yields better performance when nanofluids with smaller nanoparticles are used. Furthermore, the overall thermal resistance of the MCHS is reduced significantly by increasing the pumping power. The heat transfer performance of Al_2O_3-water and diamond-water nanofluids was 21.6% better than that of pure water. The results reported here may facilitate improvements in the thermal performance of MCHSs.
机译：通过数值研究研究了使用纳米流体在3-D微通道散热器（MCHS）中的传热增强。向冷却剂流体中添加纳米颗粒会以与纳米颗粒的类型，基础流体，颗粒体积分数，颗粒大小和泵送功率密切相关的方式改变其热物理性质。这项工作中的计算表明，通过使用具有Al_2O_3-水纳米流体冷却的MCHS的系统，可以获得最佳的传热效果。此外，使用具有较低动态粘度的基础流体（例如水）和具有高导热率的基材可以增强MCHS的热性能。结果还表明，随着纳米流体的颗粒体积分数增加，热阻先降低然后增加。通过在给定的几何条件下适当调节体积分数和泵浦功率，可以获得最低的热阻。对于中等粒度范围，当使用纳米颗粒较小的纳米流体时，MCHS可获得更好的性能。此外，通过增加泵浦功率，可大大降低MCHS的整体热阻。 Al_2O_3-水和金刚石水纳米流体的传热性能比纯水好21.6％。此处报告的结果可能有助于改善MCHS的热性能。

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