Heat Transfer through a Condensate Droplet on Hydrophobic and Nanostructured Superhydrophobic Surfaces

Shreyas Chavan, Hyeongyun Cha, Daniel Mantecon Orejon, Kashif Nawaz, Nitish Singla, Yip Fun Yeung, Deokgeun Park, Dong Hoon Kang, Yujin Chang, Yasuyuki Takata, Nenad Miljkovic

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Understanding the fundamental mechanisms governing vapor condensation on nonwetting surfaces is crucial to a wide range of energy and water applications. In this paper, we reconcile classical droplet growth modeling barriers by utilizing two-dimensional axisymmetric numerical simulations to study individual droplet heat transfer on nonwetting surfaces (90° < θa < 170°). Incorporation of an appropriate convective boundary condition at the liquid-vapor interface reveals that the majority of heat transfer occurs at the three phase contact line, where the local heat flux can be up to 4 orders of magnitude higher than at the droplet top. Droplet distribution theory is incorporated to show that previous modeling approaches underpredict the overall heat transfer by as much as 300% for dropwise and jumping-droplet condensation. To verify our simulation results, we study condensed water droplet growth using optical and environmental scanning electron microscopy on biphilic samples consisting of hydrophobic and nanostructured superhydrophobic regions, showing excellent agreement with the simulations for both constant base area and constant contact angle growth regimes. Our results demonstrate the importance of resolving local heat transfer effects for the fundamental understanding and high fidelity modeling of phase change heat transfer on nonwetting surfaces.

Original languageEnglish
Pages (from-to)7774-7787
Number of pages14
JournalLangmuir
Volume32
Issue number31
DOIs
Publication statusPublished - Aug 9 2016

Fingerprint

condensates
heat transfer
Heat transfer
condensation
Condensation
Vapors
liquid-vapor interfaces
simulation
Water
water
heat flux
Contact angle
Heat flux
vapors
boundary conditions
scanning electron microscopy
Boundary conditions
Scanning electron microscopy
Computer simulation
Liquids

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Chavan, S., Cha, H., Orejon, D. M., Nawaz, K., Singla, N., Yeung, Y. F., ... Miljkovic, N. (2016). Heat Transfer through a Condensate Droplet on Hydrophobic and Nanostructured Superhydrophobic Surfaces. Langmuir, 32(31), 7774-7787. https://doi.org/10.1021/acs.langmuir.6b01903

Heat Transfer through a Condensate Droplet on Hydrophobic and Nanostructured Superhydrophobic Surfaces. / Chavan, Shreyas; Cha, Hyeongyun; Orejon, Daniel Mantecon; Nawaz, Kashif; Singla, Nitish; Yeung, Yip Fun; Park, Deokgeun; Kang, Dong Hoon; Chang, Yujin; Takata, Yasuyuki; Miljkovic, Nenad.

In: Langmuir, Vol. 32, No. 31, 09.08.2016, p. 7774-7787.

Research output: Contribution to journalArticle

Chavan, S, Cha, H, Orejon, DM, Nawaz, K, Singla, N, Yeung, YF, Park, D, Kang, DH, Chang, Y, Takata, Y & Miljkovic, N 2016, 'Heat Transfer through a Condensate Droplet on Hydrophobic and Nanostructured Superhydrophobic Surfaces', Langmuir, vol. 32, no. 31, pp. 7774-7787. https://doi.org/10.1021/acs.langmuir.6b01903
Chavan, Shreyas ; Cha, Hyeongyun ; Orejon, Daniel Mantecon ; Nawaz, Kashif ; Singla, Nitish ; Yeung, Yip Fun ; Park, Deokgeun ; Kang, Dong Hoon ; Chang, Yujin ; Takata, Yasuyuki ; Miljkovic, Nenad. / Heat Transfer through a Condensate Droplet on Hydrophobic and Nanostructured Superhydrophobic Surfaces. In: Langmuir. 2016 ; Vol. 32, No. 31. pp. 7774-7787.
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