Abstract This study aims to experimentally investigate the effects of water/ SiO2 nanofluids on the thermal resistance of an L-shaped heat pipe. A wide range of parameters such as different nanoparticle dimensions of 11–14 nm and 60–70 nm, weight concentrations of 0.1 and 0.5 wt%, two heat pipe angles of 0 and 90 degrees, three evaporator's volume fractions of 80%, 90% and 100% and three different heat input of 5, 10 and 15 W have been taken into account for conducting this study. The results showed that thermal resistance decreased with the increase in weight concentrations to 0.5 wt% while it increased with the angle reduction. The maximum reduction in thermal resistance which was 24% observed in the nanoparticle dimension of 11–14 nm, the heat input of 10 W, weight concentration of 0.5 wt%, heat pipe angle of 90 and 100% of evaporator's volume fraction. Also, 16% of reduction in thermal resistance was also observed in case of 11–14 nm, 10 W of heat input, weight concentration of 0.5 wt%, heat pipe angle of 0 and 90% of evaporator's volume fraction. Finally, according to the results, it was observed that the increase in nanoparticle dimension affects the thermal resistance increasingly.

中文翻译：

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纳米流体对热虹吸L型热管不同角度热阻影响的实验研究

摘要 本研究旨在通过实验研究水/SiO2 纳米流体对L 形热管热阻的影响。范围广泛的参数，例如 11-14 nm 和 60-70 nm 的不同纳米颗粒尺寸，重量浓度为 0.1 和 0.5 wt%，两个热管角度为 0 和 90 度，三个蒸发器的体积分数为 80%、90% 100% 和 5、10 和 15 W 三种不同的热输入已被考虑到进行这项研究。结果表明，热阻随着重量浓度增加到0.5wt%而降低，而随着角度的减小而增加。在纳米颗粒尺寸为 11-14 nm、热输入为 10 W、重量浓度为 0.5 wt%、热管角度为 90 和 100% 的蒸发器中观察到的热阻最大降低 24% s 体积分数。此外，在 11-14 nm、10 W 热输入、0.5 wt% 重量浓度、0 热管角度和 90% 蒸发器体积分数的情况下，也观察到热阻降低 16%。最后，根据结果，观察到纳米颗粒尺寸的增加对热阻的影响越来越大。