Breaking Droplet Jumping Energy Conversion Limits with Superhydrophobic Microgrooves

Langmuir : the ACS Journal of Surfaces and Colloids
Qi PengNenad Miljkovic

Abstract

Coalescence-induced droplet jumping has the potential to enhance the performance of a variety of applications including condensation heat transfer, surface self-cleaning, anti-icing, and defrosting to name a few. Here, we study droplet jumping on hierarchical microgrooved and nanostructured smooth superhydrophobic surfaces. We show that the confined microgroove structures play a key role in tailoring droplet coalescence hydrodynamics, which in turn affects the droplet jumping velocity and energy conversion efficiency. We observed self-jumping of individual deformed droplets within microgrooves having maximum surface-to-kinetic energy conversion efficiency of 8%. Furthermore, various coalescence-induced jumping modes were observed on the hierarchical microgrooved superhydrophobic surface. The microgroove structure enabled high droplet jumping velocity (≈0.74U) and energy conversion efficiency (≈46%) by enabling the coalescence of deformed droplets in microgrooves with undeformed droplets on adjacent plateaus. The jumping velocity and energy conversion efficiency enhancements are 1.93× and 6.67× higher than traditional coalescence-induced droplet jumping on smooth superhydrophobic surfaces. This work not only demonstrates high dr...Continue Reading

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Citations

Jan 1, 2021·Journal of Colloid and Interface Science·Zhiping YuanXiaomin Wu
Mar 30, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Lei LiuFusheng Pan
Jan 15, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Chuntian LiuClarence Augustine T H Tee
Oct 6, 2021·Scientific Reports·Ali AlshehriH Pirouz Kavehpour

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