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首页> 外文期刊>Heat Transfer Engineering >Nanofluid Flow and Heat Transfer in Boundary Layers: The Influence of Concentration Diffusion on Heat Transfer Enhancement
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Nanofluid Flow and Heat Transfer in Boundary Layers: The Influence of Concentration Diffusion on Heat Transfer Enhancement

机译：纳米流体在边界层中的流动和传热：浓度扩散对传热增强的影响

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摘要

The present work uses a perturbation procedure to deduce the small perturbation differential equations for velocity, temperature, and the diffusion equation for nanoparticle volume concentration. Thermophysical variables are obtained from conventional means (e.g., mixture and field theory estimates) for nanofluids consisting of alumina nanoparticles dispersed in water (alumina-water nanofluid) and gold nanoparticles dispersed in water (gold-water nanofluid), and, in the case of gold-water nanofluid, molecular dynamics results are used to estimate such properties, including the transport coefficients. The very thin diffusion layer, at large Schmidt numbers, is found to have a great impact on the velocity and temperature profiles, owing to the transport property dependency and has a profound influence on surface conduction heat transfer rate enhancement and skin friction suppression for the case of nanofluid concentration withdrawal at the wall. In this case, the diffusional heat transfer rate is negligible, again, owing to the large Schmidt numbers encountered. Possible experiments directed at this interesting phenomenon are discussed.
机译：本工作使用微扰程序推导了速度，温度和纳米粒子体积浓度扩散方程的微扰微分方程。可以通过常规方法（例如，混合法和场论估计）获得纳米流体的热物理变量，该纳米流体由分散在水中的氧化铝纳米颗粒（氧化铝-水纳米流体）和分散在水中的金纳米颗粒（金水纳米流体）组成。金-水纳米流体的分子动力学结果被用于估算此类性质，包括传输系数。由于传输特性的依赖，发现非常大的施密特数的非常薄的扩散层对速度和温度分布有很大影响，并且对这种情况下的表面传导传热速率的提高和皮肤摩擦的抑制有深远的影响。壁上的纳米流体浓度撤离。在这种情况下，由于遇到的施密特数很大，因此扩散传热速率也可以忽略不计。讨论了针对这种有趣现象的可能实验。

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