Improvement of heat transfer by promoting dropwise condensation using electrospun polytetrafluoroethylene thin films

Hirotaka Tsuchiya, Kengo Manabe, Thomas Gaudelet, Takeo Moriya, Ken Suwabe, Mizuki Tenjimbayashi, Kyu Hong Kyong, Fredric Gillot, Seimei Shiratori

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Vapor condensation is a crucial part of a broad range of industrial applications including power generation, water harvesting, and air conditioning. Hydrophobic and superhydrophobic surfaces promote dropwise condensation in vapor-filled environments and increase their heat transfer coefficients more than filmwise condensation on hydrophilic surfaces. Although dropwise condensation can lead to energy-efficient transfer, it is hard to achieve stable dropwise condensation in high-temperature environments. To decide the best conditions for achieving higher heat transfer is also difficult because the heat transfer coefficient is influenced by not only surface wettability but also surface structures of thin films and substrates. Herein, we fabricated thin films with different wettabilities and surface structures using polytetrafluoroethylene (PTFE) which show high heat resistance to determine the best conditions for heat transfer. Several different films were prepared by electrospinning a mixed solution of PTFE and polyvinyl alcohol on aluminum (Al) and copper (Cu) tubes. After annealing them, the PTFE thin films enhanced heat transfer performance and showed stable dropwise condensation in high-temperature environments. The films fabricated by electrospinning a solution containing 66 wt% PTFE displayed the highest heat transfer coefficients, with heat transfer coefficients 64% and 61% greater than those of uncoated Al and Cu tubes, respectively. That is because homogeneous superhydrophobic surfaces that showed the highest departure frequency of condensed water droplets were fabricated using 66 wt% PTFE. The results suggest that these electrospun PTFE thin films would demonstrate excellent potential for use on the surface of heat exchangers in various industries.

Original languageEnglish
Pages (from-to)982-991
Number of pages10
JournalNew Journal of Chemistry
Volume41
Issue number3
DOIs
Publication statusPublished - 2017

Fingerprint

Polytetrafluoroethylene
Polytetrafluoroethylenes
Condensation
Heat transfer
Thin films
Heat transfer coefficients
Electrospinning
Aluminum
Surface structure
Wetting
Vapors
Water power
Polyvinyl Alcohol
Polyvinyl alcohols
Heat resistance
Air conditioning
Industrial applications
Heat exchangers
Copper
Annealing

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

Cite this

Tsuchiya, H., Manabe, K., Gaudelet, T., Moriya, T., Suwabe, K., Tenjimbayashi, M., ... Shiratori, S. (2017). Improvement of heat transfer by promoting dropwise condensation using electrospun polytetrafluoroethylene thin films. New Journal of Chemistry, 41(3), 982-991. https://doi.org/10.1039/c6nj03566c

Improvement of heat transfer by promoting dropwise condensation using electrospun polytetrafluoroethylene thin films. / Tsuchiya, Hirotaka; Manabe, Kengo; Gaudelet, Thomas; Moriya, Takeo; Suwabe, Ken; Tenjimbayashi, Mizuki; Kyong, Kyu Hong; Gillot, Fredric; Shiratori, Seimei.

In: New Journal of Chemistry, Vol. 41, No. 3, 2017, p. 982-991.

Research output: Contribution to journalArticle

Tsuchiya, H, Manabe, K, Gaudelet, T, Moriya, T, Suwabe, K, Tenjimbayashi, M, Kyong, KH, Gillot, F & Shiratori, S 2017, 'Improvement of heat transfer by promoting dropwise condensation using electrospun polytetrafluoroethylene thin films', New Journal of Chemistry, vol. 41, no. 3, pp. 982-991. https://doi.org/10.1039/c6nj03566c
Tsuchiya, Hirotaka ; Manabe, Kengo ; Gaudelet, Thomas ; Moriya, Takeo ; Suwabe, Ken ; Tenjimbayashi, Mizuki ; Kyong, Kyu Hong ; Gillot, Fredric ; Shiratori, Seimei. / Improvement of heat transfer by promoting dropwise condensation using electrospun polytetrafluoroethylene thin films. In: New Journal of Chemistry. 2017 ; Vol. 41, No. 3. pp. 982-991.
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