Numerical Study for a Large-Volume Droplet on the Dual-Rough Surface: Apparent Contact Angle, Contact Angle Hysteresis, and Transition Barrier

Langmuir ◽  
2018 ◽  
Vol 34 (27) ◽  
pp. 8119-8127 ◽  
Author(s):  
Jian Dong ◽  
Yanli Jin ◽  
He Dong ◽  
Jiawei Liu ◽  
Senbin Ye
Keyword(s):  
Contact Angle ◽  
Rough Surface ◽  
Large Volume ◽  
Numerical Study ◽  
Contact Angle Hysteresis ◽  
Apparent Contact Angle ◽  
Transition Barrier

Controlling the Wetting State With Bio-Mimetic Hierarchical Conical Microstructures

2018 ◽  
Author(s):  
Il Woong Park ◽  
Maria Fernandino ◽  
Carlos Alberto Dorao
Keyword(s):  
Contact Angle ◽  
Geometric Parameter ◽  
Contact Angle Hysteresis ◽  
Apparent Contact Angle ◽  
The Self ◽  
Self Cleaning ◽  
Conical Structures

Achieving a high apparent contact angle with a low contact angle hysteresis represent a major enabling step in applications by the self-cleaning property. In this work, bio-mimetic inspired structures complemented with silanization coating are presented for developing surfaces with a high apparent contact angle with a low contact angle hysteresis. The structures are based on hierarchical conical structures with the different geometric parameter. It was observed that the fabricated surface has high apparent contact angle and low contact angle hysteresis. For that, bio-mimetic texturing of surface and silanization coating can be applied. In this study, hierarchical conical structures were fabricated. The shape of the structures has been inspired from the surface from nature. Moreover, the effect of the silanization coating on the surfaces which has different geometric parameter has been identified.

scholarly journals Wetting of doubly periodic rough surfaces in Wenzel’s regime

2018 ◽  
Vol 145 ◽  
pp. 03006
Author(s):  
Stanimir Iliev ◽  
Nina Pesheva ◽  
Pavel Iliev
Keyword(s):  
Contact Angle ◽  
Contact Line ◽  
Numerical Study ◽  
Rough Surfaces ◽  
Contact Angle Hysteresis ◽  
Stick Slip ◽  
Liquid Meniscus ◽  
Three Phase ◽  
Mutual Disposition ◽  
Physical Defects

In this work we present preliminary results from our numerical study of the shapes of a liquid meniscus in contact with doubly sinusoidal rough surfaces in Wenzel’s wetting regime. Using the full capillary model we obtain the advancing and the receding equilibrium meniscus shapes for a broad interval of surface roughness factors. The contact angle hysteresis is obtained when the three-phase contact line is located on one row (block case) or several rows (kink case) of physical defects. We find that depending on the mutual disposition of the contact line and the lattice of periodic defects, different stick-slip behaviors of the contact line depinning mechanism appear, leading to different values of the contact angle hysteresis.

Moving contact lines on a two-dimensional rough surface

1985 ◽  
Vol 154 ◽  
pp. 1-28 ◽  
Author(s):  
Kalvis M. Jansons
Keyword(s):  
Contact Angle ◽  
Rough Surface ◽  
Rough Surfaces ◽  
Contact Angle Hysteresis ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Contact Lines ◽  
Stick Slip ◽  
Moving Contact ◽  
Moving Contact Lines

The dynamic contact angle for a contact line moving over a solid surface with random sparse spots of roughness is determined theoretically in the limit of zero capillary number. The model exhibits many of the observed characteristics of moving contact lines on real rough surfaces, including contact-angle hysteresis and stick-slip. Several types of rough surface are considered, and a comparison is made between periodic and random rough surfaces.

A NUMERICAL STUDY ON THE UNDERWATER APPARENT CONTACT ANGLE OF OIL DROPLETS ON MICROSTRUCTURE SURFACE

2019 ◽  
Vol 27 (01) ◽  
pp. 1950095 ◽  
Author(s):  
HYONCHOL CHOE ◽  
SONGHAK KIM ◽  
CHOLHUAN O ◽  
JISONG ZONG ◽  
WONCHOL SONG
Keyword(s):  
Contact Angle ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Volume Of Fluid ◽  
Contact Angles ◽  
Apparent Contact Angle ◽  
Oil Droplets ◽  
Oil Droplet ◽  
Vof Model ◽  
Baxter Model

In this study, the apparent contact angles of oil droplets on the rough surfaces in water were numerically studied using the Volume of Fluid (VOF) model. The results showed that the roughness of the surface affected the wettability. By increasing the roughness of the surface, the oleophilicity of the oleophilic surface and the oleophobicity of the oleophobic surface could be increased. Furthermore, the applicability and limitations of the prediction of the underwater apparent contact angle of the oil droplet by the contact angle model were investigated by 3D numerical simulations. It suggests that Wenzel model can accurately predict the underwater apparent contact angle of oil droplets on all the oleophilic, neutral and oleophobic surfaces, and Cassie model can only be applied to the oleophobic surface and Cassie–Baxter model can only be applied to the oleophilic surface.

scholarly journals Apparent contact angle and contact angle hysteresis on liquid infused surfaces

Soft Matter ◽  
2017 ◽  
Vol 13 (1) ◽  
pp. 101-110 ◽  
Author(s):  
Ciro Semprebon ◽  
Glen McHale ◽  
Halim Kusumaatmaja
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Strong Dependence ◽  
Relative Size ◽  
Apparent Contact Angle

The apparent contact angle and contact angle hysteresis of a droplet on liquid infused surfaces have strong dependence on the relative size between the droplet and its surrounding wetting ridge.

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
Sign in / Sign up

Export Citation Format

Share Document