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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

COMPARISON OF HEAT TRANSFER PERFORMANCE ON HOMOGENEOUS SURFACE AND HETEROGENEOUS SURFACE

Lei Zou
Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Baohai Yang
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Hong Wang
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Xun Zhu
Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Yu-Dong Ding
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, MOE, Chongqing, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Rong Chen
Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Qiang Liao
Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

DOI: 10.1615/IHTC16.mpf.023053
pages 6747-6753


KEY WORDS: Heat transfer enhancement, Impact, Droplet, Evaporation, Patterned surface

Abstract

When the droplet impacts on the heterogeneous surface consisting of alternating super-hydrophobic and hydrophilic stripes, it will split out into multiple tiny droplets. This splitting behavior will affect the heat transfer between the liquid and solid. In this article, the droplet impact process and evaporation process on the hydrophilic surface, super-hydrophobic surface and heterogeneous surface is studied by visualized experiment. The result shows that the evaporation time of the droplet on the super-hydrophobic surface is longest, and the time required for droplet vaporization on the heterogeneous is only 52% of that on the hydrophilic surface. Therefore, the method for partially coating with super-hydrophobic material on the hydrophilic surface can effectively promoting the droplet evaporation, which can improve the endothermic power of droplet from 0.753 W to 1.449 W.

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