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International Heat Transfer Conference 16

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

Droplet freezing on micro-textured surfaces exposed to humid air

Yuan Wang
Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, China; College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China

Zhen-guo Wang
College of Aerospace Science and Engineering, National University of Defense Technology, Hunan, Changsha 410073, People's Republic of China

DOI: 10.1615/IHTC16.mpf.021762
pages 6163-6170


KEY WORDS: droplet freezing, micro-textured surface, hydrophobic, recalescence, solidification

Abstract

Water droplet freezing on textured micropillar surfaces has been observed visually and thermographically. Hydrophobic surfaces with three different topographies were selected, the contact angle of water on which were 138.05°, 101.79° and 140.75° at 25.8°C and 96.496°, 76.4° and 121.794°at -6.3°C. According to the experiment, the droplet experiences four successive stages to become fully frozen. The ice shell formation at icing incipience has been captured. Besides, the solidification frontier movement, bubbles generation and entrapment inside the droplet are analyzed. Besides, the freezing rate is higher at the solidification frontier edge based on the temperature distribution. This paper is the first study showing the droplet temperature distribution from lateral view with very high-quality visualization images revealing the details inside the droplet while freezing.

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