Nonspecular Reflection of Droplets

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Pingan Zhu
  • Chengmin Chen
  • Krishnaswamy Nandakumar
  • Liqiu Wang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2006695
Journal / PublicationSmall
Volume17
Issue number3
Online published21 Dec 2020
Publication statusPublished - 21 Jan 2021

Abstract

The bouncing of droplets on super-repellent surfaces normally resembles specular reflection that obeys the law of reflection. Here, the nonspecular reflection of droplet impingement onto solid surfaces with a dimple for energy-efficient, omnidirectional droplet transport is reported. With the dimple of the radius being comparable to that of the droplet, all the symmetries in the law of reflection can be broken down so that the droplet is endowed with a translational velocity finely tunable in both its direction and magnitude simply by varying the radii of the droplet and the dimple, the impinging position, and droplet Weber number. Tailoring the initial and translational velocity of impinging droplets would steer their reflected trajectories at will, thus enabling versatile droplet manipulation including trapping, shedding, antigravity transport, targeted positioning, and on-demand coalescence of droplets.

Research Area(s)

  • droplet impact, liquid repellency, nonspecular reflection of droplets, omnidirectional droplet transport, symmetry breaking

Citation Format(s)

Nonspecular Reflection of Droplets. / Zhu, Pingan; Chen, Chengmin; Nandakumar, Krishnaswamy; Wang, Liqiu.

In: Small, Vol. 17, No. 3, 2006695, 21.01.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review