学术论文

      超疏水冷表面上液滴冻结的可视化观测

      Visual observation of water droplet freezing on superhydrophobic cold surface

      摘要:
      对超疏水和普通表面上液滴冻结过程进行了对比试验观测,对液滴初始冻结时间和液滴冻结持续时间进行了对比研究,并对超疏水表面延缓液滴冻结的机制进行了理论分析。试验结果发现:与普通表面相比,超疏水表面上液滴初始冻结时间和液滴冻结持续时间明显滞后,不同冷表面温度下,超疏水表面均可有效延迟液滴冻结。表面接触角和粗糙度的综合效应,可显著增加相变所需吉布斯自由能壁垒,同时减少液滴平板之间传热面积是延缓液滴初始冻结和液滴冻结过程发生的根本原因。
      Abstract:
      A comparative experimental study on water droplet freezing on superhydrophobic and ordinary surface has been conducted and a comparative analysis was carried out concerning the initial droplet freezing time and freezing duration time. In addition, a theoretical analysis was made about the mechanism of delaying water droplet freezing on superhydrophobic surface. The experimental results indicated that compared with that of ordinary surface, the initial droplet freezing time and freezing duration time on superhydrophobic surface could be remarkablely delayed and under different cold plate temperature conditions, all the droplets freezing process could be effectively delayed on superhydrophobic surface. Besides, the combination of surface contact angle and roughness could significantly increase the Gibbs free energy difference for phase change and reduce the heat transfer area between droplets and cold surface, which was the primary cause for delaying the initial droplet freezing time and freezing duration time on superhydrophobic surface.
      作者: 李栋 [1] 张文娣 [2] 赵孝保 [1] 王鑫 [2] 钱晨露 [2]
      Author: LI Dong [1] ZHANG Wendi [2] ZHAO Xiaobao [1] WANG Xin [2] QIAN Chenlu [2]
      作者单位: 南京师范大学 能源与机械工程学院,江苏 南京 210042; 江苏省能源系统过程转化与减排技术工程实验室,江苏 南京 210042 南京师范大学 能源与机械工程学院,江苏 南京,210042
      年,卷(期): 2016, 38(6)
      分类号: TK124
      在线出版日期: 2016年12月23日
      基金项目: 江苏省自然科学基金青年基金(BK20150979);江苏省高校自然科学基金面上项目