The thermal conductivity of Er₂O₃/ethylene glycol (EG) nanofluids was investigated at different concentrations of Er₂O₃ nanoparticles in the temperature range of 20–50 °C. The findings showed that the volume fraction of Er₂O₃ nanoparticles and temperature affect the thermal conductivity. The thermal conductivity increases with increasing Er₂O₃ concentration and temperature, and the Er₂O₃/EG nanofluid showed higher thermal conductivity than the base fluid. Precise correlations are proposed to forecast the thermal conductivity of the Er₂O₃/EG nanofluid relative to the base fluid. These results are promising for using Er₂O₃/EG nanofluid in solar thermal applications.

中文翻译：

---

用于热能应用的氧化铒/乙二醇纳米流体热导率的实验和理论研究

在 20–50 °C 的温度范围内，研究了不同浓度的 Er ₂ O _{3纳米粒子的 Er 2} O ₃ /乙二醇 (EG) 纳米流体的热导率。研究结果表明，Er ₂ O ₃纳米颗粒的体积分数和温度会影响热导率。导热系数随着Er ₂ O ₃浓度和温度的增加而增加，Er ₂ O ₃ /EG纳米流体显示出比基液更高的导热系数。提出了精确的相关性来预测 Er ₂ O _{3的热导率}/EG 纳米流体相对于基液。这些结果有望在太阳能热应用中使用 Er ₂ O _{3 /EG 纳米流体。}