The present study investigates the ability to improve the stability and heat transfer performance of coolants by dispersing TiO2 nanoparticles in water. Surfactant-free nanofluid with 5 different weight fractions of 1 %, 0.5 %, 0.1 %, 0.05 %, and 0.01 % were prepared by two-step method. The stability of nanofluid was examined. The thermal conductivity and viscosity of TiO2/water nanofluid of 5 concentrations were determined over the temperatures ranging from 25 °C to 60 °C for every 5 °C interval. New correlations (with R2 = 99 %) based on the experimental data of thermal conductivity and viscosity of nanofluids has been presented. Several performance criteria were determined to investigate the heat transfer and pumping power performance of nanofluid. TiO2/water nanofluid showed some interesting results and enhanced heat transfer capability which enables it as a potential candidate for the future cooling medium.

中文翻译：

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提高二氧化钛/水纳米流体的热物理特性和传热潜力

本研究调查了通过将 TiO2 纳米粒子分散在水中来提高冷却剂稳定性和传热性能的能力。通过两步法制备了具有 1%、0.5%、0.1%、0.05% 和 0.01% 5 个不同重量分数的无表面活性剂纳米流体。检查纳米流体的稳定性。在 25°C 至 60°C 的温度范围内，每 5°C 间隔测定 5 种浓度的 TiO2/水纳米流体的热导率和粘度。已经提出了基于纳米流体的热导率和粘度的实验数据的新相关性（R2 = 99%）。确定了几个性能标准来研究纳米流体的传热和泵送功率性能。