@article{ff079b0c06bf4d93a60ed6261b22257c,
title = "Biphilic jumping-droplet condensation",
abstract = "Jumping-droplet condensation on rough superhydrophobic surfaces exhibits increased heat-transfer rates when compared with dropwise condensation on smooth hydrophobic surfaces. However, the performance of superhydrophobic surfaces is limited by the low individual droplet growth rates associated with their extreme apparent advancing contact angles. Here, we report that biphilic surfaces having smooth, low-surface-energy spots on a superhydrophobic background exhibit a 10× higher jumping-droplet condensation heat-transfer coefficient when compared with homogeneous superhydrophobic surfaces. Our detailed condensation heat-transfer modeling coupled with numerical simulations of binary and coordinated droplet coalescence show that spot wettability should not be optimized toward minimizing droplet nucleation energy barriers. Rather, spot wettability should be optimized to minimize droplet adhesion while maximizing individual droplet growth rates. Model-predicted design optimization of a variety of biphilic surfaces is validated against experiments. Our findings provide design guidelines for biphilic surface development to maximize condensation heat transfer.",
keywords = "adhesion, biphilic, condensation, coordinated, droplet, energy, heat transfer, jumping, structured surfaces, superhydrophobic",
author = "Hoque, {Muhammad Jahidul} and Shreyas Chavan and Ross Lundy and Longnan Li and Jingcheng Ma and Xiao Yan and Shenghui Lei and Nenad Miljkovic and Ryan Enright",
note = "Funding Information: This work is supported by funding from the Office of Naval Research (grant no. N00014-16-1-2625) and the Air Conditioning and Refrigeration Center, an NSF-founded I/UCRC at UIUC. N.M. gratefully acknowledges the support of the International Institute for Carbon Neutral Energy Research, sponsored by the Japanese Ministry of Education, Culture, Sports, Science, and Technology. SEM was carried out in part in the Materials Research Laboratory Central Facilities, University of Illinois. N.M. and R.E. supervised the project. N.M. and R.E conceived the idea for the work. M.J.H. S.C. and S.L conducted the modeling with the supervision of N.M. and R.E. Sample fabrication, sample characterization, and condensation experiments were carried out by M.J.H. S.C. R.L. L.L. and J.M. Data processing and analysis was done by M.J.H. S.C. and X.Y. M.J.H. S.C. N.M. and R.E. wrote the manuscript with input from all coauthors. The authors declare no competing interests. Funding Information: This work is supported by funding from the Office of Naval Research (grant no. N00014-16-1-2625 ) and the Air Conditioning and Refrigeration Center, an NSF-founded I/UCRC at UIUC. N.M. gratefully acknowledges the support of the International Institute for Carbon Neutral Energy Research, sponsored by the Japanese Ministry of Education, Culture, Sports, Science, and Technology. SEM was carried out in part in the Materials Research Laboratory Central Facilities, University of Illinois. Publisher Copyright: {\textcopyright} 2022 Nokia Bell Labs",
year = "2022",
month = apr,
day = "20",
doi = "10.1016/j.xcrp.2022.100823",
language = "English (US)",
volume = "3",
journal = "Cell Reports Physical Science",
issn = "2666-3864",
publisher = "Cell Press",
number = "4",
}