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Development of new correlations for convective heat transfer and friction factor in turbulent regime for nanofluids

机译:纳米流体湍流中对流换热与摩擦因数的新相关性发展

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This paper presents new correlations for the convective heat transfer and the friction factor developed from the experiments of nanoparticles comprised of aluminum oxide, copper oxide and silicon dioxide dispersed in 60% ethylene glycol and 40% water by mass. The experimental measurements were carried out in the fully developed turbulent regime for the aforementioned three different nanofluids at various particle volumetric concentrations. First, the Theological and the thermophysical properties such as viscosity, density, specific heat and thermal conductivity were measured at different temperatures for varying particle volume concentrations. Next, these properties were used to develop the heat transfer coefficient correlation from experiments, as a function of these properties and the particle volumetric concentration. The pressure loss was also measured and a new correlation was developed to represent the friction factor for nanofluids.
机译:本文介绍了对流传热和摩擦因数的新的相关性,该关系是由分散在60%乙二醇和40%质量的水中的由氧化铝,氧化铜和二氧化硅组成的纳米粒子的实验得出的。在各种颗粒体积浓度下,针对上述三种不同的纳米流体,在完全发展的湍流状态下进行了实验测量。首先,在不同的温度下,对于不同的颗粒体积浓度,测量了流变学和热物理性质,例如粘度,密度,比热和热导率。接下来,根据这些特性和颗粒体积浓度,将这些特性用于根据实验建立传热系数的相关性。还测量了压力损失,并开发了一种新的相关性来表示纳米流体的摩擦系数。

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