发动机冷却系统中纳米颗粒效应的分析与实验研究

Ebisa Kejela, Prof. Rajendiran Gopal
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摘要

水是集成电路发动机冷却系统中的传统冷却剂。纳米技术的最新发展改进了纳米粒子在汽车发动机冷却系统中的原始用途。在这项研究中,使用〖Al〗_2 O_3 和〖TiO〗_2 两种纳米粒子形成的纳米液体被添加到四冲程内燃机散热器中,并与传统冷却液(纯水)进行了比较。在基础液中添加这些纳米粒子的目的是为了提高冷却液的导热性。首先使用基础水作为冷却剂并进行模拟。然后将〖〗Al_2 O_3和〖〗TiO_2纳米粒子添加到基液中作为冷却剂,并进行CFD流体模拟。结果表明,与基础流体相比,2% 的〖铝〗_2 O_3 纳米粒子的传热效果提高了 15.04%,4% 的〖铝〗_2 O_3 纳米粒子的传热效果提高了 21.28%,而与基础流体相比,2% 的〖氧化钛〗_2 纳米粒子的传热效果提高了 14.28%,4% 的 TiO2 纳米粒子的传热效果提高了 18.69%。与〖钛氧〗_2相比,〖铝〗_2 O_3纳米粒子的效果更好,而且纳米粒子的浓度对冷却系统的传热速率有积极影响。通过可视化和紫外可见光谱吸光度测量对纳米颗粒分散的稳定性进行了实验研究,通过 pH 值调节制备的〖Al〗_2 O_3 纳米流体相对更稳定,pH 值为 7.5。实验分别使用纯水和冷却液中的纳米颗粒,结果表明,0.02 浓度的纳米颗粒可将传热率提高 17.5%。纳米粒子浓度和流速的增加会导致传热速率的增加,从而改善散热器的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analytical and Experimental Study of Nano Particles Effect in Engine Cooling System
Water is the conventional coolant in the IC engine cooling system. The most recent developments in nanotechnology have led to improvements in the original uses of Nanoparticles in car engine cooling systems. In this study, Nano fluids formed by using kinds of nanoparticles 〖Al〗_2 O_3 and 〖TiO〗_2 were added to the four-stroke internal combustion engine radiator and compared with the conventional coolant (pure water). The purpose of adding these nanoparticles to base fluid is to improve thermal conductivity of the coolant. First base water is used as coolant and simulation is carried out. Then 〖Al〗_2 O_3 and 〖TiO〗_2 nanoparticles had added in base fluid as coolant and CFD fluent simulation is carried out. The result shows that Nanoparticles of 2% 〖Al〗_2 O_3 is 15.04% enhancement of heat transfer than base fluid and 4% 〖Al〗_2 O_3 increases heat transfer rate to 21.28% while 2% of 〖TiO〗_2 is 14.28%enhancement of heat transfer compared to base fluid and 4% TiO2 increases the rate of heat transfer to 18.69%. 〖Al〗_2 O_3 Nanoparticles shows better result than 〖TiO〗_2 and concentration of nanoparticles has a positive effect on the heat transfer rate of the cooling system. The experimental investigation on stability Nanoparticles dispersion through visualization and UV. visible spectroscopy absorbance measurement is carried out on 〖Al〗_2 O_3 Nano fluid prepared by pH modification and pH~7.5 is relatively more stable. Experiments are performed with pure water and Nanoparticles in coolant separately and results showed that 0.02 concentration of Nanoparticles enhances heat transfer rate by 17.5%. Increases the concentration of nanoparticles and flowrate leads to increases heat transfer rate which leads to improved radiator performance.
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