Abonnement à la biblothèque: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

Droplet freezing on micro-textured surfaces exposed to humid air

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpf.021762
pages 6163-6170

Résumé

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.