Dynamic water contact angle during initial phases of droplet impingement

被引：14

作者：

Remer, Michal ^{[1
]}

Psarski, Maciej ^{[1
]}

Gumowski, Konrad ^{[1
]}

Rokicki, Jacek ^{[1
]}

Sobieraj, Grzegorz ^{[1
]}

Kaliush, Maryna ^{[1
]}

Pawlak, Daniel ^{[2
]}

Celichowski, Grzegorz ^{[2
]}

机构：

[1] Warsaw Univ Technol, Inst Aeronaut & Appl Mech, Dept Aerodynam, Nowowiejska 24, PL-00665 Warsaw, Poland

[2] Univ Lodz, Dept Mat Technol & Chem, Fac Chem, Pomorska 163, PL-90236 Lodz, Poland

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2016年 / 508卷

关键词：

Droplet impact; Dynamic contact angle; Contact angle hysteresis; Hydrophobic surfaces; Hydrophilic surfaces; Experimental techniques; SELF-ASSEMBLED MONOLAYERS; SUPERHYDROPHOBIC SURFACES; LIQUID-DROP; IMPACT; AIR; HYSTERESIS; SAMS;

D O I：

10.1016/j.colsurfa.2016.08.028

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigate the dynamics of water contact angle during droplet impact onto substrates with three different surface coatings (one hydrophilic and two hydrophobic). The experiments are carried out for three Weber numbers (We) of approximately 5, 7 and 10. The dynamic contact angle is determined by analysis of consecutive frames of video recordings taken at a frame rate of 50 000 fps. Measurements are carried out for the first advancing (spreading) and receding (retracting) phases of droplet impingement. We find that the evolution of contact angle during impingement is not directly related to contact angle values obtained from traditional static and quasi-static measurements (sessile drop, tilting plate, or Wilhelmy plate methods). We propose that the dynamics of contact angle resulting from fluid flow more accurately reflects surface physico-chemical properties than the values obtained from static and quasi-static measurements. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：57 / 69

页数：13

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