Appearance of a low superheat "quasi-Leidenfrost" regime for boiling on superhydrophobic surfaces

Ileana Malavasi, B. Bourdon, P. Di Marco, J. De Coninck, Marco Marengo

Research output: Contribution to journalArticle

Abstract

Pool boiling experimentswere performedwith degassedwater on stainless steel substrateswith different surface topographies and wettabilities. Boiling curves and visual observations of the boiling process have been carried out. The onset of nucleate boiling (ONB) has been measured and the influence of roughness and wettability has been quantified. Boiling curve shape is different between the hydrophilic and the superhydrophobic cases; superhydrophobic surfaces reaching the ONB heat flux at a lower superheat and presenting a "quasi-Leidenfrost" regime, without showing the typical boiling curve. Bubbles are easier to form on superhydrophobic surfaces, therefore the nucleation temperature is smaller, and bubbles are larger and stable. The ONB appears after less than 5 K of superheat on superhydrophobic surfaces,while on hydrophilic surfaces, with the samesurface roughness, the superheat is above 7 K. Furthermore, superhydrophobic sampleswith a different roughness present the same boiling curve, meaning that, when the contact angle exceeds a certain value, thewettability has a predominant role on the surface roughness.
Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalInternational Communications in Heat and Mass Transfer
Volume63
DOIs
Publication statusPublished - 30 Apr 2015

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boiling
nucleate boiling
roughness
curves
wettability
bubbles
visual observation
heat flux
stainless steels
topography
surface roughness
nucleation
temperature

Keywords

  • Wettability
  • Superhydrophobicity
  • Pool boiling
  • Boiling onset
  • Nucleation

Cite this

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title = "Appearance of a low superheat {"}quasi-Leidenfrost{"} regime for boiling on superhydrophobic surfaces",
abstract = "Pool boiling experimentswere performedwith degassedwater on stainless steel substrateswith different surface topographies and wettabilities. Boiling curves and visual observations of the boiling process have been carried out. The onset of nucleate boiling (ONB) has been measured and the influence of roughness and wettability has been quantified. Boiling curve shape is different between the hydrophilic and the superhydrophobic cases; superhydrophobic surfaces reaching the ONB heat flux at a lower superheat and presenting a {"}quasi-Leidenfrost{"} regime, without showing the typical boiling curve. Bubbles are easier to form on superhydrophobic surfaces, therefore the nucleation temperature is smaller, and bubbles are larger and stable. The ONB appears after less than 5 K of superheat on superhydrophobic surfaces,while on hydrophilic surfaces, with the samesurface roughness, the superheat is above 7 K. Furthermore, superhydrophobic sampleswith a different roughness present the same boiling curve, meaning that, when the contact angle exceeds a certain value, thewettability has a predominant role on the surface roughness.",
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author = "Ileana Malavasi and B. Bourdon and {Di Marco}, P. and {De Coninck}, J. and Marco Marengo",
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language = "English",
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Appearance of a low superheat "quasi-Leidenfrost" regime for boiling on superhydrophobic surfaces. / Malavasi, Ileana; Bourdon, B.; Di Marco, P.; De Coninck, J.; Marengo, Marco.

In: International Communications in Heat and Mass Transfer, Vol. 63, 30.04.2015, p. 1-7.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Appearance of a low superheat "quasi-Leidenfrost" regime for boiling on superhydrophobic surfaces

AU - Malavasi, Ileana

AU - Bourdon, B.

AU - Di Marco, P.

AU - De Coninck, J.

AU - Marengo, Marco

PY - 2015/4/30

Y1 - 2015/4/30

N2 - Pool boiling experimentswere performedwith degassedwater on stainless steel substrateswith different surface topographies and wettabilities. Boiling curves and visual observations of the boiling process have been carried out. The onset of nucleate boiling (ONB) has been measured and the influence of roughness and wettability has been quantified. Boiling curve shape is different between the hydrophilic and the superhydrophobic cases; superhydrophobic surfaces reaching the ONB heat flux at a lower superheat and presenting a "quasi-Leidenfrost" regime, without showing the typical boiling curve. Bubbles are easier to form on superhydrophobic surfaces, therefore the nucleation temperature is smaller, and bubbles are larger and stable. The ONB appears after less than 5 K of superheat on superhydrophobic surfaces,while on hydrophilic surfaces, with the samesurface roughness, the superheat is above 7 K. Furthermore, superhydrophobic sampleswith a different roughness present the same boiling curve, meaning that, when the contact angle exceeds a certain value, thewettability has a predominant role on the surface roughness.

AB - Pool boiling experimentswere performedwith degassedwater on stainless steel substrateswith different surface topographies and wettabilities. Boiling curves and visual observations of the boiling process have been carried out. The onset of nucleate boiling (ONB) has been measured and the influence of roughness and wettability has been quantified. Boiling curve shape is different between the hydrophilic and the superhydrophobic cases; superhydrophobic surfaces reaching the ONB heat flux at a lower superheat and presenting a "quasi-Leidenfrost" regime, without showing the typical boiling curve. Bubbles are easier to form on superhydrophobic surfaces, therefore the nucleation temperature is smaller, and bubbles are larger and stable. The ONB appears after less than 5 K of superheat on superhydrophobic surfaces,while on hydrophilic surfaces, with the samesurface roughness, the superheat is above 7 K. Furthermore, superhydrophobic sampleswith a different roughness present the same boiling curve, meaning that, when the contact angle exceeds a certain value, thewettability has a predominant role on the surface roughness.

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