instability of two-dimensional meniscus: (a) receding contact angle; (b) advancing contact angle.

2004 ◽  
pp. 417-419
Keyword(s):  
Contact Angle ◽  
Two Dimensional ◽  
Receding Contact ◽  
Advancing Contact Angle ◽  
Receding Contact Angle

scholarly journals Numerical Simulation of Residual Oil Flooded by Polymer Solution in Microchannels

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yang Liu ◽  
Jiawei Fan ◽  
Lili Liu ◽  
Shuren Yang
Keyword(s):  
Contact Angle ◽  
Polymer Solution ◽  
Oil Recovery ◽  
Wetting Angle ◽  
Polymer Flooding ◽  
Residual Oil ◽  
Receding Contact ◽  
Advancing Contact Angle ◽  
Receding Contact Angle ◽  
The Impact

This paper establishes a flow equation using non-Newtonian fluid mechanics and defines the deformation of residual oil using numerical computation in order to conduct a study on the flow law of residual oil in microchannels of rock during polymer flooding, the influence of flooding fluid elasticity on the deformation of residual oil, and flooding mechanism of viscoelastic displacing fluid. Computation shows that advancing contact angle increases and receding contact angle decreases as the viscosity ratio decreases. The higher elasticity of polymer solution with higher concentration or molecular weight leads to significantly more obvious deformation of residual oil and benefits migration and stripping of residual oil. The impact of the initial wetting angle of residual oil film on deformation is analyzed. A smaller initial wetting angle corresponds to a bigger change of advancing contact angle and smaller change of receding contact angle. A better understanding of the flooding process is gained via a study on residual oil deformation in polymer flooding. Consequently, oil flooding efficiency and oil recovery can be enhanced. This is the hydrodynamic mechanism of enhanced oil recovery (EOR) by polymer flooding.

The Surface Modification with Fluorocarbon Thin Films for the Prevention of Stiction in Mems

1998 ◽  
Vol 518 ◽  
Author(s):  
Sang-Ho Lee ◽  
Myong-Jong Kwon ◽  
Jin-Goo Park ◽  
Yong-Kweon Kim ◽  
Hyung-Jae Shin
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Contact Angles ◽  
Fluorocarbon Films ◽  
Perfluorodecanoic Acid ◽  
Large Hysteresis ◽  
Static Contact ◽  
Receding Contact ◽  
Highly Hydrophobic ◽  
Receding Contact Angle

AbstractHighly hydrophobic fluorocarbon films were prepared by the vapor phase (VP) deposition method in a vacuum chamber using both liquid (3M's FC40, FC722) and solid sources (perfluorodecanoic acid (CF3(CF2)8COOH), perfluorododecane (C12F26)) on Al, Si and oxide coated wafers. The highest static contact angles of water were measured on films deposited on aluminum substrate. But relatively lower contact angles were obtained on the films on Si and oxide wafers. The advancing and receding contact angle analysis using a captive drop method showed a large contact angle hysteresis (ΔH) on the VP deposited fluorocarbon films. AFM study showed poor film coverage on the surface with large hysteresis. FTIR-ATR analysis positively revealed the stretching band of CF2 groups on the VP deposited substrates. The thermal stability of films was measured at 150°C in air and nitrogen atmospheres as a function of time. The rapid decrease of contact angles was observed on VP deposited FC and PFDA films in air. However, no decrease of contact angle on them was observed in N2.

The effect of contact line dynamics and drop formation on measured values of receding contact angle at very low capillary numbers

2012 ◽  
Vol 404 ◽  
pp. 63-69 ◽  
Author(s):  
Carmen L. Moraila-Martínez ◽  
Francisco J. Montes Ruiz-Cabello ◽  
Miguel A. Cabrerizo-Vílchez ◽  
Miguel A. Rodríguez-Valverde
Keyword(s):  
Contact Angle ◽  
Contact Line ◽  
Drop Formation ◽  
Receding Contact ◽  
Receding Contact Angle ◽  
Contact Line Dynamics

Measurement of dynamic/advancing/receding contact angle by video‐enhanced sessile drop tensiometry

1996 ◽  
Vol 67 (8) ◽  
pp. 2852-2858 ◽  
Author(s):  
Shi‐Yow Lin ◽  
Hong‐Chi Chang ◽  
Lung‐Wei Lin ◽  
Pao‐Yao Huang
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Receding Contact ◽  
Receding Contact Angle

Determination of the Receding Contact Angle of Sessile Drops on Polymer Surfaces by Evaporation

Langmuir ◽  
1999 ◽  
Vol 15 (21) ◽  
pp. 7378-7385 ◽  
Author(s):  
H. Yildirim Erbil ◽  
G. McHale ◽  
S. M. Rowan ◽  
M. I. Newton
Keyword(s):  
Contact Angle ◽  
Polymer Surfaces ◽  
Receding Contact ◽  
Receding Contact Angle ◽  
Sessile Drops

On the Uniqueness of the Receding Contact Angle: Effects of Substrate Roughness and Humidity on Evaporation of Water Drops

Langmuir ◽  
2014 ◽  
Vol 30 (31) ◽  
pp. 9346-9354 ◽  
Author(s):  
Paola G. Pittoni ◽  
Chia-Hui Lin ◽  
Teng-Shiang Yu ◽  
Shi-Yow Lin
Keyword(s):  
Contact Angle ◽  
Substrate Roughness ◽  
Receding Contact ◽  
Water Drops ◽  
Receding Contact Angle
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