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

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.