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dc.contributor.authorShi, Meng
dc.contributor.authorDas, Ratul
dc.contributor.authorArunachalam, Sankara
dc.contributor.authorMishra, Himanshu
dc.date.accessioned2021-02-17T11:23:31Z
dc.date.available2021-02-17T11:23:31Z
dc.date.issued2021-02-04
dc.identifier.urihttp://hdl.handle.net/10754/667499
dc.description.abstractThe Leidenfrost phenomenon entails the levitation of a liquid droplet over a superheated surface, cushioned by its vapor layer. For water, superhydrophobic surfaces are believed to suppress the Leidenfrost point ($\it{T}$$_{\rm L}$)-the temperature at which this phenomenon occurs. The vapor film obstructs boiling heat transfer in heat exchangers, thereby compromising energy efficiency and safety. Thus, it is desirable to realize superhydrophobicity without suppressing $\it{T}$$_{\rm L}$. Here we demonstrate that the $\it{T}$$_{\rm L}$ of water on microtextured superhydrophobic surfaces comprising doubly reentrant pillars (DRPs) can exceed those on hydrophilic and even superhydrophilic surfaces. We disentangle the contributions of microtexture, heat transfer, and surface chemistry on $\it{T}$$_{\rm L}$ and reveal how superhydrophobicity can be realized without suppressing $\it{T}$$_{\rm L}$. For instance, silica surfaces with DRPs facilitate ~300% greater heat transfer to water droplets at 200$^{\circ}$C in comparison with silica surfaces coated with perfluorinated-nanoparticles. Thus, superhydrophobic surfaces could be harnessed for energy efficient thermal machinery.
dc.description.sponsorshipThis work was supported by King Abdullah University of Science and Technology (KAUST). M.S. thanks Prof. Sigurdur Thoroddsen from KAUST and Prof. Shangsheng Feng from Xi’an Jiaotong University for fruitful discussions.
dc.publisherarXiv
dc.relation.urlhttps://arxiv.org/pdf/2102.02499
dc.rightsArchived with thanks to arXiv
dc.titleUnexpected Suppression of Leidenfrost Phenomenon on Superhydrophobic Surfaces
dc.typePreprint
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentInterfacial Lab
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.eprint.versionPre-print
dc.identifier.arxivid2102.02499
kaust.personShi, Meng
kaust.personDas, Ratul
kaust.personArunachalam, Sankara
kaust.personMishra, Himanshu
refterms.dateFOA2021-02-17T11:24:14Z


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