Motion of Liquid Drops on Surfaces Induced by Asymmetric Vibration: Role of Contact Angle Hysteresis

Langmuir ◽  
2011 ◽  
Vol 27 (16) ◽  
pp. 10327-10333 ◽  
Author(s):  
Srinivas Mettu ◽  
Manoj K. Chaudhury
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Liquid Drops ◽  
Asymmetric Vibration

scholarly journals Role of contact-angle hysteresis for fluid transport in wet granular matter

2015 ◽  
Vol 91 (4) ◽  
Author(s):  
Roman Mani ◽  
Ciro Semprebon ◽  
Dirk Kadau ◽  
Hans J. Herrmann ◽  
Martin Brinkmann ◽  
...  
Keyword(s):  
Contact Angle ◽  
Fluid Transport ◽  
Contact Angle Hysteresis ◽  
Granular Matter

SUPERHYDROPHOBIC SURFACES FOR WATER-REPELLENT OR SELF-CLEANING BEHAVIOR: CHEMICAL EFFECT

2009 ◽  
Vol 16 (05) ◽  
pp. 645-652
Author(s):  
Y. P. ZHOU ◽  
Z. W. LIN ◽  
J. BROWN
Keyword(s):  
Contact Angle ◽  
Thermodynamic Analysis ◽  
Contact Angle Hysteresis ◽  
Superhydrophobic Surfaces ◽  
Chemical Effect ◽  
Water Repellent ◽  
Cleaning Behavior ◽  
Self Cleaning ◽  
Intrinsic Contact Angle

In this study, a thermodynamic analysis is conducted to investigate the chemical effect, in terms of intrinsic contact angle (CA), on the superhydrophobic behavior. It is theoretically revealed that the essential effect of intrinsic CA is to promote the composite transition. In particular, a large intrinsic CA more than 90° is necessary for such transition. Furthermore, for a pillar system with an intrinsic CA smaller than 90°, composite states are not impossible but is thermodynamically unstable. Once composite states are achieved, the advancing or maximum CA always approaches 180° whether an intrinsic CA is larger or smaller than 90°. In addition, the role of intrinsic CA in the water-repellent or self-cleaning behavior such as contact angle hysteresis (CAH) and equilibrium CA has been discussed in detail.

Motion of Newtonian drops deposited on liquid-impregnated surfaces induced by vertical vibrations

2019 ◽  
Vol 876 ◽  
Author(s):  
Paolo Sartori ◽  
Elia Guglielmin ◽  
Davide Ferraro ◽  
Daniele Filippi ◽  
Annamaria Zaltron ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Contact Angle ◽  
Fast Rate ◽  
Contact Angle Hysteresis ◽  
Solid Surfaces ◽  
Distilled Water ◽  
Liquid Drops ◽  
Dynamical Phase ◽  
Viscous Drops ◽  
Vertical Vibrations

We have studied the motion of drops on inclined liquid-impregnated surfaces (LISs) subject to vertical vibrations. The liquid drops comprise distilled water and different aqueous solutions of glycerol of increasing viscosity. The use of weak pinning LISs strongly affects the dynamical phase diagram. First of all, there is no trace of the dominant static region at low oscillating amplitudes reported for oscillating solid surfaces characterized by contact angle hysteresis. On the contrary, at sufficiently low oscillating amplitudes, the drops always move downwards with a velocity that depends only on the drop viscosity. Further increasing the oscillating amplitude may drive the drop upwards against gravity, as reported for dry surfaces. The use of more viscous drops widens this climbing region. Arguably, the main novelty of this work concerns the observation of two distinct descending regimes where the downhill speed differs by a factor of five or more. Fast-rate videos show that the evolution of the drop profile is diverse in the two regimes, likely because the vertical oscillations reduce the effect of the oil meniscus surrounding the drop at high accelerations.

A NEW APPROACH TO INVESTIGATE CONTACT ANGLE HYSTERESIS

2018 ◽  
Author(s):  
Qiao Liu ◽  
Abbasali Abouei Mehrizi ◽  
Hao Wang
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
New Approach
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