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Micro/nanoscale phase-change physics  

   > Two-phase closed thermosyphon

Intelligent thermal management 

Nanoengineered thermal materials

Renewable thermal energy solutions

Condensation on corona-charged film

The polar nature of water has been widely demonstrated to enable droplet manipulation on voltage-applied surfaces. However, how the voltage-applied surfaces influence on the condensation behavior of water droplets remains unclear. Therefore, we have investigated the condensation behavior on a polymer film subjected to a negative voltage across its entire surface through the ionization of air via corona discharge. We found that condensation performance is enhanced on voltage-applied surfaces, and we are conducting further research to quantify this result. In particular, by employing vision algorithm, we have meticulously analyzed the condensation behavior on charged surfaces, confirming significant improvements in average droplet radius and droplet fraction. Additionally, we intend to explore the relationship between surface roughness and wettability using Atomic Force Microscopy (AFM) to determine how surface charging influences these characteristics. Moreover, we are planning to  investigate the condensation on surfaces subjected to positive corona charging. Ultimately, the goal of this research is to identify how corona discharge can enhance condensation performance on polymer film and the environmental conditions under which surface charging maximizes condensation heat transfer.

Multiscale Energy Laboratory

​Department of Mechanical Engineering ㅣ Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon, South Korea ㅣ Email: ysnam1@kaist.ac.kr

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