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用于散热器应用的混合启发式冷却液的热性能

Thermal Performance of Hybrid-Inspired Coolant for Radiator Application.

作者信息

Benedict F, Kumar Amit, Kadirgama K, Mohammed Hussein A, Ramasamy D, Samykano M, Saidur R

机构信息

Faculty of Engineering Technology Mechanical and Automotive, Universiti Malaysia Pahang, Pekan 26600, Malaysia.

School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia.

出版信息

Nanomaterials (Basel). 2020 Jun 2;10(6):1100. doi: 10.3390/nano10061100.

DOI:10.3390/nano10061100
PMID:32498258
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7353276/
Abstract

Due to the increasing demand in industrial application, nanofluids have attracted the considerable attention of researchers in recent decades. The addition of nanocellulose (CNC) with water (W) and ethylene glycol (EG) to a coolant for a radiator application exhibits beneficial properties to improve the efficiency of the radiator. The focus of the present work was to investigate the performance of mono or hybrid metal oxide such as AlO and TiO with or without plant base-extracted CNC with varying concentrations as a better heat transfer nanofluid in comparison to distilled water as a radiator coolant. The CNC is dispersed in the base fluid of EG and W with a 60:40 ratio. The highest absorption peak was noticed at 0.9% volume concentration of TiO, AlO, CNC, AlO/TiO, and AlO/CNC nanofluids which indicates a better stability of the nanofluids' suspension. Better thermal conductivity improvement was observed for the AlO nanofluids in all mono nanofluids followed by the CNC and TiO nanofluids, respectively. The thermal conductivity of the AlO/CNC hybrid nanofluids with 0.9% volume concentration was found to be superior than that of the AlO/TiO hybrid nanofluids. AlO/CNC hybrid nanofluid dominates over other mono and hybrid nanofluids in terms of viscosity at all volume concentrations. CNC nanofluids (all volume concentrations) exhibited the highest specific heat capacity than other mono nanofluids. Additionally, in both hybrid nanofluids, AlO/CNC showed the lowest specific heat capacity. The optimized volume concentration from the statistical analytical tool was found to be 0.5%. The experimental results show that the heat transfer coefficient, convective heat transfer, Reynolds number and the Nusselt number have a proportional relationship with the volumetric flow rate. Hybrid nanofluids exhibit better thermal conductivity than mono nanofluids. For instance, a better thermal conductivity improvement was shown by the mono AlO nanofluids than the CNC and TiO nanofluids. On the other hand, superior thermal conductivity was observed for the AlO/CNC hybrid nanofluids compared to the other mono and hybrid ones (AlO/TiO).

摘要

由于工业应用中的需求不断增加，近几十年来纳米流体引起了研究人员的广泛关注。将纳米纤维素（CNC）与水（W）和乙二醇（EG）添加到用于散热器的冷却液中，展现出有助于提高散热器效率的有益特性。本工作的重点是研究单一或混合金属氧化物（如AlO和TiO）在添加或不添加植物基提取的不同浓度CNC的情况下，作为比蒸馏水更好的传热纳米流体用于散热器冷却液时的性能。CNC以60:40的比例分散在EG和W的基础流体中。在TiO、AlO、CNC、AlO/TiO和AlO/CNC纳米流体的体积浓度为0.9%时观察到最高吸收峰，这表明纳米流体悬浮液具有更好的稳定性。在所有单一纳米流体中，AlO纳米流体的热导率提高效果最佳，其次分别是CNC和TiO纳米流体。发现体积浓度为0.9%的AlO/CNC混合纳米流体的热导率优于AlO/TiO混合纳米流体。在所有体积浓度下，AlO/CNC混合纳米流体在粘度方面优于其他单一和混合纳米流体。CNC纳米流体（所有体积浓度）的比热容高于其他单一纳米流体。此外，在两种混合纳米流体中，AlO/CNC的比热容最低。通过统计分析工具得出的优化体积浓度为0.5%。实验结果表明，传热系数、对流换热、雷诺数和努塞尔数与体积流量成正比关系。混合纳米流体的热导率优于单一纳米流体。例如，单一的AlO纳米流体的热导率提高效果优于CNC和TiO纳米流体。另一方面，与其他单一和混合纳米流体（AlO/TiO）相比，AlO/CNC混合纳米流体的热导率更高。

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