铜基纳米结构疏水表面冷凝传热实验研究

发布时间：2018-11-01 15:02

【摘要】：为研究纳米结构差异性对冷凝传热性能的影响,通过化学刻蚀法、电化学沉积法、水热法等方法制备了不同结构的Cu(OH)_2纳米线、C_(36)H_(70)CuO_4纳米片及CuO纳米花等疏水表面。实验测得Cu(OH)_2纳米线表面静态接触角最大,达到151.9°;而C_(36)H_(70)CuO_4纳米片表面和CuO纳米花表面接触角较为接近,分别为130.5°和124.7°。通过冷凝传热对比实验发现,Cu(OH)_2纳米线和CuO纳米花结构表面能够维持稳定滴状冷凝,且CuO纳米花结构表面传热性能最佳。虽然液滴在C_(36)H_(70)CuO_4纳米片表面成核密度最大,但由于无法维持稳定的滴状冷凝,其传热性能不到纳米花表面的50%。此外,传热性能测试实验后,Cu(OH)_2纳米线和CuO纳米花表面性质基本保持不变,但C_(36)H_(70)CuO_4表面接触角下降到82.6°,试样表面的片状多孔纳米结构因C_(36)H_(70)CuO_4在高温蒸汽中分解而受到破坏。
[Abstract]:Cu (OH) _ 2 nanowires with different structures were prepared by chemical etching, electrochemical deposition and hydrothermal method in order to study the effect of nanostructure differences on condensation heat transfer. The hydrophobic surfaces of C _ (36) H _ (70) CuO_4 nanoparticles and CuO nanoparticles were investigated. The maximum static contact angle of Cu (OH) _ 2 nanowires was 151.9 掳, while the contact angle of C _ (36) H _ (70) CuO_4 nanoparticles and CuO nanowires was 130.5 掳and 124.7 掳, respectively. It is found that the surface of, Cu (OH) _ 2 nanowires and CuO nanorods can maintain a steady trickle condensation and the surface heat transfer performance of CuO nano-flower structure is the best through the contrastive experiment of condensation heat transfer. Although the nucleation density of droplets on the surface of C36 H70 CuO_4 nanoparticles is the largest, the heat transfer performance of the droplets is less than 50% of that on the surface of C36 H70 nanoparticles due to the inability to maintain a steady droplet condensation. In addition, the surface properties of, Cu (OH) _ 2 nanowires and CuO nanowires remained basically unchanged, but the contact angle of C _ (36) H _ (70) CuO_4 surface decreased to 82.6 掳. The flake porous nanostructures on the surface of the samples were destroyed by the decomposition of C36 H70 CuO_4 in high temperature steam.
【作者单位】：西安交通大学化学工程与技术学院;伊利诺伊大学机械科学与工程系;西安交通大学动力工程多相流国家重点实验室;
【基金】：高等学校博士学科点专项科研基金资助项目(20120201120068) 国家自然科学基金资助项目(5130614)
【分类号】：TB383.1

【相似文献】