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Effects of Sonication Period on Colloidal Stability and Thermal Conductivity of SiO2–Water Nanofluid: An Experimental Investigation
Journal of Cluster Science ( IF 2.8 ) Pub Date : 2021-06-05 , DOI: 10.1007/s10876-021-02100-w
Sayantan Mukherjee , Purna Chandra Mishra , Shanta Chakrabarty , Paritosh Chaudhuri

The objective of the present work is to analyze the consequences of the sonication period on the colloidal stability and thermal conductivity of SiO2–water nanofluid. Ultrasonication assisted two-step method was applied to prepare SiO2–water nanofluid at two different concentrations of 0.5 and 1 wt% without any surfactant. The sonication period varied from 1 to 3 h. Particle size was analysed by direct light scattering (DLS). Zeta potential analysis and light absorbance test were performed to check the colloidal stability of nanofluids. The thermal conductivity of nanofluid was measured over the temperature range of 25–60 °C. The obtained results indicate that increasing sonication time is crucial for the enhacement in stability and thermal conductivity of nanofluid. With increasing temperature, the thermal conductivity of nanofluids also increased. Moreover, at lower temperature, sonication plays a dominant role on thermal conductivity enhacement in nanofluids. The investigation concludes that a minimum 2.5 h of sonication is required for the better performance of nanofluids.



中文翻译:

超声处理时间对 SiO2-水纳米流体胶体稳定性和热导率的影响:实验研究

本工作的目的是分析超声处理时间对 SiO 2 -水纳米流体的胶体稳定性和热导率的影响。超声辅助两步法制备SiO 2– 两种不同浓度的 0.5 和 1 重量%水纳米流体,不含任何表面活性剂。超声处理时间从 1 小时到 3 小时不等。通过直接光散射 (DLS) 分析粒度。进行Zeta电位分析和吸光度测试以检查纳米流体的胶体稳定性。在25-60°C的温度范围内测量纳米流体的热导率。所得结果表明,增加超声处理时间对于提高纳米流体的稳定性和导热性至关重要。随着温度的升高,纳米流体的热导率也增加。此外,在较低温度下,超声处理对纳米流体的热导率增强起主导作用。调查得出的结论是,为了获得更好的纳米流体性能,至少需要 2.5 小时的超声处理。

更新日期:2021-06-05
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