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

YUAN Jindou1 WANG Yanbo1 HU Han1 YU Xiongjiang1 XU Jinliang1

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

【Abstract】The hydrophobic surface embedded with arrayed hydrophilic dots was prepared on a copper surface with mesh screen and Teflon solution. Completely hydrophilic copper surface, completely hydrophobic Teflon-coated surface and hydrophilic/hydrophobic hybrid surface are taken into consideration which serve as the bottom heat transfer area of rectangular mini-channels (1.5 mm hydraulic diameter). In this experiment, the 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, the steam condensation heat transfer coefficient on hybrid surface is about 454.6% higher than that of the completely hydrophilic surface and 107.3% higher than the completely hydrophobic surface at most. A high-speed camera provides the photos of two-phase flow pattern, especially the periodic behavior of the droplets nucleation, coalescence and flush which can explain the mechanism of heat transfer enhancement.

【Keywords】 condensation; hydrophilic/hydrophobic surface; mini-channel; heat transfer coefficient;


【Funds】 Key Program of the National Natural Science Foundation of China (51436004) National Natural Science Foundation of China (51676071)

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This Article


CN: 11-1946/TQ

Vol 69, No. 10, Pages 4156-4166+4496

October 2018


Article Outline


  • Introduction
  • 1 Surface preparation and characterization
  • 2 Mini-channel packaging and experimental system
  • 3 Experimental results and discussion
  • 4 Mechanism of enhanced heat transfer in hydrophobic–hydrophilic hybrid channel
  • 5 Conclusion
  • Symbol description
  • References