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Thermal characteristics and performance of Ag-water nanofluid: Application to natural circulation loops

机译：Ag-水纳米流体的热特性和性能：在自然循环中的应用

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摘要

The goal of this study is to investigate the thermal conductivity, viscosity and thermal performance in a single-phase natural circulation mini loop of Ag-water nanofluid which can be a potential working fluid for natural convective flat-plate solar collectors. The silver-water nanofluid with 5 wt% concentration, which contains also polyvinylpyrrolidone (PVP) with 1.25 wt%, was purchased. Then, the sample was diluted with de-ionized water to four different concentrations of 0.25, 0.5, 0.75 and 1 wt%. Thermal conductivity and viscosity were measured by 3 omega method and Brookfield rheometer, respectively. An effectiveness factor was used to define the thermal performance of Ag-water nanofluids for different inclination angles and heating powers. The results showed that nanofluid samples are thermally less conductive than the literature, at ambient temperature (23 degrees C). The viscosity of nanofluid decreases significantly with increasing temperature and increases with increasing concentration. Our measurements appear to be more compatible with PVP solution results available in the literature. Effectiveness is enhanced up to 11% with 1 wt% concentrated nanofluid compared to de-ionized water and the effectiveness of the mini loop indicates an enhancement with increase in inclination angle and particle concentration at whole applied power. According to obtained results, it is concluded that Ag-water nanofluid has a promising potential to be used in natural convective flat-plate solar collector. (C) 2016 Elsevier Ltd. All rights reserved.
机译：这项研究的目的是研究Ag-水纳米流体的单相自然循环微型回路中的导热系数，粘度和热性能，该回路可能是自然对流平板太阳能集热器的潜在工作流体。购买了浓度为5 wt％的银水纳米流体，其中还包含1.25 wt％的聚乙烯吡咯烷酮（PVP）。然后，将样品用去离子水稀释至0.25、0.5、0.75和1 wt％的四种不同浓度。导热率和粘度分别通过3Ω方法和布鲁克菲尔德流变仪测量。使用效率因子来定义Ag-水纳米流体在不同倾角和加热功率下的热性能。结果表明，在环境温度（23摄氏度）下，纳米流体样品的导热性低于文献报道。纳米流体的粘度随温度升高而显着降低，并随浓度升高而升高。我们的测量似乎与文献中提供的PVP解决方案结果更加兼容。与去离子水相比，使用1 wt％的浓缩纳米流体可以将效率提高到11％，微型回路的效率表明在整个施加功率下，随着倾角和颗粒浓度的增加，效率也会提高。根据获得的结果，可以得出结论，Ag-水纳米流体在自然对流平板太阳能集热器中具有广阔的应用前景。 （C）2016 Elsevier Ltd.保留所有权利。

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