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首页> 外文期刊>Journal of Heat Transfer >Thermal Nanofluid Property Model With Application to Nanofluid Flow in a Parallel-Disk System-Part Ⅰ: A New Thermal Conductivity Model for Nanofluid Flow
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Thermal Nanofluid Property Model With Application to Nanofluid Flow in a Parallel-Disk System-Part Ⅰ: A New Thermal Conductivity Model for Nanofluid Flow

机译:热纳米流体特性模型及其在平行盘系统中的纳米流体流动中-第一部分:一种新型的纳米流体导热系数模型

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This is a two-part paper, which proposes a new theory explaining the experimentally observed enhancement of the thermal conductivity, k_nf, of nanofluids (Part Ⅰ) and discusses simulation results of nanofluid flow in a radial parallel-plate channel using different k_(nf)- models (Part Ⅱ). Specifically, Part Ⅰ provides the derivation of the new model as well as comparisons with benchmark experimental data sets and other theories, focusing mainly on aluminum and copper oxide nanoparticles in water. The new thermal conductivity expression consists of a base-fluid static part, k_(bf), and a new "micromixing" part, k_(mm), i.e., k_(nf)= k_(bf)+ k_(mm). While k_(bf) relies on Maxwell's theory, k_(mm) encapsulates nanopar-ticle characteristics and liquid properties as well as Brownian-motion induced nanopar-ticle fluctuations, nanoparticle volume fractions, mixture-temperature changes, particle-particle interactions, and random temperature fluctuations causing liquid-particle interactions. Thus, fundamental physics principles include the Brownian-motion effect, an extended Langevin equation with scaled interaction forces, and a turbulence-inspired heat transfer equation. The new model predicts experimental data for several types of metal-oxide nanoparticles (20
机译:这是一个分为两部分的论文,提出了一个新的理论来解释实验观察到的纳米流体的导热系数k_nf的增强(第一部分),并讨论了使用不同k_(nf )模型(第二部分)。具体而言,第一部分提供了新模型的推导以及与基准实验数据集和其他理论的比较,主要集中于水中的铝和氧化铜纳米粒子。新的导热率表达式由基本流体静态部分k_(bf)和新的“微混合”部分k_(mm)组成,即k_(nf)= k_(bf)+ k_(mm)。尽管k_(bf)依赖麦克斯韦理论,但k_(mm)封装了纳米粒子的特性和液体特性以及布朗运动引起的纳米粒子的涨落,纳米粒子的体积分数,混合物温度变化,粒子-粒子之间的相互作用以及随机性温度波动会引起液-固相互作用。因此,基本的物理原理包括布朗运动效应,具有成比例的相互作用力的扩展兰格文方程和湍流激发的热传递方程。新模型预测了几种类型的金属氧化物纳米颗粒(20

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