ABSTRACT

The present paper reports the experimental investigation of nucleate pool boiling heat transfer above heating surface with the creation of new geometric micro-cavities. Cylindrical, cubic, and pentagonal micro-cavities created on heating surface were studied. Micro-cavity surfaces were fabricated using a fiber laser machine. The heat transfer coefficient (HTC) of the heating surfaces were estimated experimentally by using pure water and water–Al₂O₃ nanofluid. The results showed that by creating geometrical micro-cavity on the heating surface, a maximum improvement of 83%–123.4% was obtained when using pure water. At a concentration of 0.005 vol.% nanofluid, the HTC increased by 95.2%–140.5% for different micro-cavities.

摘要

本文报告了在加热表面上方的核池沸腾传热的实验研究，并创建了新的几何微腔。研究了在加热表面上产生的圆柱形、立方和五边形微腔。使用光纤激光机制造微腔表面。通过使用纯水和水-Al ₂ O ₃纳米流体对加热表面的传热系数（HTC）进行了实验估计。结果表明，通过在受热面上创建几何微腔，使用纯水时最大提高了83%~123.4%。在 0.005 vol.% 的纳米流体浓度下，不同微腔的 HTC 增加了 95.2%–140.5%。