微小通道内不同润湿性表面流动冷凝传热

doi:10.11949/j.issn.0438-1157.20180342

化工学报 ›› 2018, Vol. 69 ›› Issue (10): 4156-4166.DOI: 10.11949/j.issn.0438-1157.20180342

微小通道内不同润湿性表面流动冷凝传热

袁金斗, 王彦博, 胡涵, 余雄江, 徐进良

华北电力大学低品位能源多相流与传热北京市重点实验室, 北京 102206

收稿日期:2018-04-02 修回日期:2018-07-16 出版日期:2018-10-05 发布日期:2018-10-05
通讯作者: 徐进良
基金资助:
国家自然科学基金重点项目（51436004）；国家自然科学基金项目（51676071）。

Flow condensation heat transfer on surfaces with different wettability in mini-channel

YUAN Jindou, WANG Yanbo, HU Han, YU Xiongjiang, XU Jinliang

Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy, North China Electric Power University, Beijing 102206, China

Received:2018-04-02 Revised:2018-07-16 Online:2018-10-05 Published:2018-10-05
Supported by:
supported by the Key Program of the National Natural Science Foundation of China (51436004) and the National Natural Science Foundation of China (51676071).

摘要/Abstract

摘要：

利用丝网烧结和聚四氟乙烯溶液（Teflon）浸渍法，在铜表面上制备了亲疏水匹配的结构，即在疏水四氟涂层上有阵列排布的椭圆亲水点，仅有四氟涂层的全疏水表面和不作修饰的全亲水铜表面作为对照，考察了以这三种表面为底部换热区域的矩形微小通道（水力直径1.5 mm）的换热特性和流动特性。实验的通道内蒸汽质量流速为10～60 kg·m^-2·s^-1，干度为0.3～1，亲疏水匹配表面与亲水表面相比，蒸汽冷凝传热系数（HTC）最高增加了454.6%，与全疏水表面相比，传热系数最高增加了107.3%，利用高速相机拍摄可视化照片，观察了通道内气液两相，尤其是表面液滴成核、聚并、冲刷的周期运动过程，解释了亲疏水匹配表面强化传热的机理。

关键词: 凝结, 亲疏水表面, 微小通道, 传热系数

Abstract:

Hydrophobic surface embedded with arrayed hydrophilic dots can be prepared on a copper surface with mesh screen and Teflon solution. Completely hydrophilic copper surface, completely hydrophobic Teflon-coated surface and hydrophobic-hydrophilic hybrid surfaces are taken into consideration which are served as the bottom heat transfer area of 1.5 mm hydraulic diameter rectangular mini-channels. In this experiment, vapor mass velocity ranges from 10 kg·m^-2·s^-1 to 60 kg·m^-2·s^-1, while the vapor quality from 0.3 to 1. According to the experimental investigation, steam condensation heat transfer coefficient on hybrid surface is about 454.6% higher than that of completely hydrophilic surface and 107.3% higher than completely hydrophobic surface at most. High speed camera provided the photos of two-phase flow pattern, especially the periodic behavior of the droplets nucleation, coalescence and flushing which can explain the mechanism of heat transfer enhancement.

Key words: condensation, hydrophilic/hydrophobic surface, mini-channel, heat transfer coefficient

中图分类号:

袁金斗, 王彦博, 胡涵, 余雄江, 徐进良. 微小通道内不同润湿性表面流动冷凝传热[J]. 化工学报, 2018, 69(10): 4156-4166.

YUAN Jindou, WANG Yanbo, HU Han, YU Xiongjiang, XU Jinliang. Flow condensation heat transfer on surfaces with different wettability in mini-channel[J]. CIESC Journal, 2018, 69(10): 4156-4166.

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微小通道内不同润湿性表面流动冷凝传热

Flow condensation heat transfer on surfaces with different wettability in mini-channel

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