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首页> 外文期刊>Journal of Heat Transfer >Convective Heat Transfer of AI_2O_3 Nanofluids in Porous Media
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Convective Heat Transfer of AI_2O_3 Nanofluids in Porous Media

机译：多孔介质中AI_2O_3纳米流体的对流传热

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摘要

In this study, the performance of a heat sink embedded with a porous medium and nanofluids as coolants is analyzed experimentally. The nanofluid is a mixture of de-ionized water and nanoscale Al_2O_3 particles with three different volumetric concentrations: £ = 0.41%, 0.58%, and 0.83%. The experimental test section is a rectangular minichannel filled with metal foam, which is electrically heated to provide a constant heat flux. The porous medium is assumed to be homogeneous and the flow regime is laminar. The result of heat transfer enhancement by slurry of Al_2O_3 nanofluid in porous media is studied under various flow velocities, heat flux, porous media structure, and particle concentration of nanofluid. The effect of particles volume fraction on heat transfer coefficient is also studied. This experimental study discovers and/or confirms the following hypotheses: (1) nanoparticle slurry in conjunction with metal foam has a significant effect on heat transfer rate; (2) there is an optimum permeability for the foam resulting in maximal heat transfer rate; (3) for a fixed particle concentration, smaller particles are more effective in enhancing heat transfer; and (4) increasing particle concentration results in some gains, but this trend weakens after a threshold.
机译：在这项研究中，实验分析了嵌入多孔介质和纳米流体作为冷却剂的散热器的性能。纳米流体是去离子水和具有三个不同体积浓度的纳米级Al_2O_3颗粒的混合物：£= 0.41％，0.58％和0.83％。实验测试部分是一个充满金属泡沫的矩形微型通道，将其电加热以提供恒定的热通量。假设多孔介质是均匀的，流动状态是层流的。研究了在各种流速，热通量，多孔介质结构和纳米流体颗粒浓度下，Al_2O_3纳米流体在多孔介质中的淤浆增强传热的结果。还研究了颗粒体积分数对传热系数的影响。该实验研究发现和/或证实了以下假设：（1）纳米颗粒浆料与金属泡沫相结合对传热速率有显着影响； （2）泡沫具有最佳的渗透性，从而实现最大的热传递率； （3）对于固定的颗粒浓度，较小的颗粒在增强热传递方面更有效； （4）增加颗粒浓度会带来一些好处，但是这种趋势在阈值以下会减弱。

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