Capillary Rise of a Non-Newtonian Power Law Liquid: Impact of the Fluid Rheology and Dynamic Contact Angle

Langmuir ◽  
2008 ◽  
Vol 24 (23) ◽  
pp. 13663-13667 ◽  
Author(s):  
Rafael M. Digilov
Keyword(s):  
Contact Angle ◽  
Power Law ◽  
Capillary Rise ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Liquid Impact ◽  
Fluid Rheology

Capillary Rise with Velocity-Dependent Dynamic Contact Angle

Langmuir ◽  
2008 ◽  
Vol 24 (21) ◽  
pp. 12710-12716 ◽  
Author(s):  
M. N. Popescu ◽  
J. Ralston ◽  
R. Sedev
Keyword(s):  
Contact Angle ◽  
Capillary Rise ◽  
Dynamic Contact Angle ◽  
Dynamic Contact

Capillary Rise: Validity of the Dynamic Contact Angle Models

Langmuir ◽  
2017 ◽  
Vol 33 (32) ◽  
pp. 7862-7872 ◽  
Author(s):  
Pingkeng Wu ◽  
Alex D. Nikolov ◽  
Darsh T. Wasan
Keyword(s):  
Contact Angle ◽  
Capillary Rise ◽  
Dynamic Contact Angle ◽  
Dynamic Contact

scholarly journals Spreading Kinetics of Herschel-Bulkley Fluids Over Solid Substrates

2020 ◽  
Vol 8 ◽  
Author(s):  
Jie Zhang ◽  
Hai Gu ◽  
Jianhua Sun ◽  
Bin Li ◽  
Jie Jiang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Film Thickness ◽  
Yield Stress ◽  
Power Law ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Yield Behavior ◽  
Yield Zone ◽  
Solid Substrates ◽  
Kinetics Of

The spreading kinetics of Herschel-Bulkley fluids on horizontal solid substrates were theoretically studied. The equations of film thickness were derived in both gravitational and capillary regimes. The dynamic contact angle for the capillary regime was also derived. Finally, a limiting result for the case of τ0 = 0 was obtained, which was compared with the known solution for validation. The results show that the yield behavior of the fluids had a significant impact on the spreading kinetics in both cases. Only when stress was larger than the yield stress, would substantial flow occur. The spreading zone was divided into two parts by the yield surface: sheared zone and yield zone, which was completely different from common Newtonian fluids or power-law fluids. The thickness of the yield zone mainly depended on yield stress and pressure gradient along the z-direction. According to the final evolution, both the film thickness and dynamic contact angle were affected not only by the power-law index but also by the yield behavior.

Effect of dynamic contact angle on capillary rise phenomena

2000 ◽  
Vol 161 (1) ◽  
pp. 81-87 ◽  
Author(s):  
Alain Siebold ◽  
Michel Nardin ◽  
Jacques Schultz ◽  
André Walliser ◽  
Max Oppliger
Keyword(s):  
Contact Angle ◽  
Capillary Rise ◽  
Dynamic Contact Angle ◽  
Dynamic Contact

Visualization of Dynamic Contact Angle

2013 ◽  
Author(s):  
Brandon S. Field
Keyword(s):  
Contact Angle ◽  
Contact Line ◽  
High Speed ◽  
Solid Phase ◽  
Capillary Rise ◽  
Dynamic Contact Angle ◽  
Fluid Phase ◽  
Dynamic Contact ◽  
Force Balance ◽  
Receding Contact

Capillary rise of air-water-solid systems have been recorded with high-speed video. Glass and metal have been used as the solid phase, and the dynamic shape of the meniscus and contact angle have been characterized. The advancing and receding contact angle is of interest in computational simulations of boiling flow, and the present visualizations attempt to quantify the dynamic aspects of contact line motion. The centroid of the capillary meniscus has been tracked in order to determine the force at the contact line based on a force balance of the elevated fluid phase. The solid phase is raised and lowered in the fluid at different rates to observe advancing and receding contact lines.

Evolution of Liquid Meniscus Shape in a Capillary Tube

2007 ◽  
Vol 129 (8) ◽  
pp. 957-965 ◽  
Author(s):  
Shong-Leih Lee ◽  
Hong-Draw Lee
Keyword(s):  
Contact Angle ◽  
Contact Line ◽  
Capillary Rise ◽  
Stress Singularity ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Surface Flow ◽  
Force Balance ◽  
Liquid Meniscus ◽  
Meniscus Shape

There are still many unanswered questions related to the problem of a capillary surface rising in a tube. One of the major questions is the evolution of the liquid meniscus shape. In this paper, a simple geometry method is proposed to solve the force balance equation on the liquid meniscus. Based on a proper model for the macroscopic dynamic contact angle, the evolution of the liquid meniscus, including the moving speed and the shape, is obtained. The wall condition of zero dynamic contact angle is allowed. The resulting slipping velocity at the contact line resolves the stress singularity successfully. Performance of the present method is examined through six well-documented capillary-rise examples. Good agreements between the predictions and the measurements are observable if a reliable model for the dynamic contact angle is available. Although only the capillary-rise problem is demonstrated in this paper, the concept of this method is equally applicable to free surface flow in the vicinity of a contact line where the capillary force dominates the flow.

Investigation of behavior of the dynamic contact angle in a problem of convective flows

2017 ◽  
Vol 5 (4) ◽  
pp. 27-42
Author(s):  
O.N Goncharova ◽  
◽  
I.V. Marchuk ◽  
A.V. Zakurdaeva ◽  
◽  
...  
Keyword(s):  
Contact Angle ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Convective Flows
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