Surfactants with a wide range of uses are often preferred to reduce particle aggregation in nanofluid and provide stability. However, added surfactants affect the properties of not only nanofluids but also base fluids. In this study, binary mixtures were prepared by using water and three different surfactants, namely, SDS, Tween 80, and NP 10, in four different concentrations of 0.2 % to 0.8 % by weight, separately. Density, thermal conductivity, and viscosity values of these prepared mixtures were measured experimentally at atmospheric pressure and the temperature of 298 to 338 K. Then, correlations were derived with respect to the data obtained for the studied parameter ranges. According to the result, a quadratic polynomial with coefficients was fitted for the density equation and two models for viscosity behavior were derived. Moreover, Thermal conductivity correlations were developed as second-order polynomials of temperature and concentration function. The proposed correlations showed good agreement with our experimental results.

中文翻译：

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大气压下不同种类表面活性剂水溶液的热导率和粘度与温度的关系

具有广泛用途的表面活性剂通常是首选，以减少纳米流体中的颗粒聚集并提供稳定性。然而，添加的表面活性剂不仅会影响纳米流体的特性，还会影响基础流体的特性。在本研究中，分别使用水和三种不同的表面活性剂，即 SDS、吐温 80 和 NP 10，分别以 0.2% 至 0.8% 的四种不同浓度制备二元混合物。在大气压和 298 到 338 K 的温度下通过实验测量这些制备的混合物的密度、热导率和粘度值。然后，根据研究参数范围获得的数据推导出相关性。根据结果​​，对密度方程拟合了一个带系数的二次多项式，并推导出了两种粘度行为模型。而且，热导率相关性被开发为温度和浓度函数的二阶多项式。所提出的相关性与我们的实验结果非常吻合。