Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 18: Solid-liquid Interfaces II

O 18.13: Talk

Monday, March 31, 2014, 19:00–19:15, WIL A317

The Theoretical and Experimental Study on the Dynamic Ice-making system Using Supercooling Water Based on the Nano-fluorocarbon Coating Material — •Hong Wang — School of civil engineering, Henan Institute of Engineering, Zhengzhou city, China

Supercooling water is used as a superior method to generate ice slurry for its high efficiency and energy conservation. However, the ice blockage occurred in the supercooling heat exchanger is a prominent problem that reduces the efficiency of the ice generation system. In order to avoid or retard ice blockage, a fluorocarbon coating with super-hydrophobicity was applied onto the surface of the supercooling heat exchanger to continuously make ice slurry without any additive. The characteristics of the coated surface with fluorocarbon coating was determined and analyzed relatively. The results showed that the nano-fluorocarbon film in the average thickness was only 9.7nm. It was the very thin film made the solid surface superhydrophobicity with the contact angle of 163.01°. This film not only has a good property in anti-icing but also anti-scale. Compared with the uncoated surface, the process of water freezing on the coated surface with nano-fluorocarbon was slower which demonstrated that the icing on the coated surface was restrained in the experiment. It was also found that the supercooling degree in the coated supercooling heat exchanger was higher, the supercooling state was longer, and the time of ice blockage was delayed. Thus, more ice production can be obtained accordingly and the efficiency of the whole ice-making system was enhanced.