Universal evolution of a viscous–capillary spreading drop

Soft Matter ◽  
2016 ◽  
Vol 12 (28) ◽  
pp. 6073-6078 ◽  
Author(s):  
Sumesh P. Thampi ◽  
Ignacio Pagonabarraga ◽  
Ronojoy Adhikari ◽  
Rama Govindarajan
Keyword(s):  
Capillary Spreading

scholarly journals Dynamics of capillary spreading along hydrophilic microstripes

2001 ◽  
Vol 64 (3) ◽  
Author(s):  
Anton A. Darhuber ◽  
Sandra M. Troian ◽  
Walter W. Reisner
Keyword(s):  
Capillary Spreading

scholarly journals Capillary spreading of contact line over a sinking sphere

2017 ◽  
Vol 111 (13) ◽  
pp. 134102 ◽  
Author(s):  
Seong Jin Kim ◽  
Kamel Fezzaa ◽  
Jim An ◽  
Tao Sun ◽  
Sunghwan Jung
Keyword(s):  
Contact Line ◽  
Capillary Spreading

Spreading of Liquids in Textile Assemblies Part II: Effects of Softening on Capillary Spreading

1986 ◽  
Vol 56 (10) ◽  
pp. 617-621 ◽  
Author(s):  
Tokuzo Kawase ◽  
Sakiko Sekoguchi ◽  
Tomiko Fuj ◽  
Motoi Minagawa
Keyword(s):  
Capillary Spreading

Capillary spreading of a droplet in the partially wetting regime using a diffuse-interface model

2007 ◽  
Vol 572 ◽  
pp. 367-387 ◽  
Author(s):  
V. V. KHATAVKAR ◽  
P. D. ANDERSON ◽  
H. E. H. MEIJER
Keyword(s):  
Liquid Droplet ◽  
Spectral Element ◽  
Contact Angles ◽  
Diffuse Interface ◽  
Equilibrium Contact Angle ◽  
Interface Model ◽  
Governing Equations ◽  
Ambient Fluid ◽  
Diffuse Interface Model ◽  
Capillary Spreading

The spreading of a liquid droplet on a smooth solid surface in the partially wetting regime is studied using a diffuse-interface model based on the Cahn--Hilliard theory. The model is extended to include non-90$^{\circ}$ contact angles. The diffuse-interface model considers the ambient fluid displaced by the droplet while spreading as a liquid. The governing equations of the model for the axisymmetric case are solved numerically using a finite-spectral-element method. The viscosity of the ambient fluid is found to affect the time scale of spreading, but the general spreading behaviour remains unchanged. The wettability expressed in terms of the equilibrium contact angle is seen to influence the spreading kinetics from the early stages of spreading. The results show agreement with the experimental data reported in the literature.

scholarly journals Water transport and absorption in pharmaceutical tablets – a numerical study

Meccanica ◽  
2019 ◽  
Vol 55 (2) ◽  
pp. 421-433 ◽  
Author(s):  
Povilas Vaitukaitis ◽  
Dario Maggiolo ◽  
Johan Remmelgas ◽  
Susanna Abrahmsén-Alami ◽  
Diana Bernin ◽  
...  
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Coating Process ◽  
Droplet Impingement ◽  
Pharmaceutical Tablets ◽  
Pharmaceutical Tablet ◽  
Capillary Spreading ◽  
Spreading Time ◽  
Good Agreement

AbstractThe quality of a coated pharmaceutical tablet can be strongly affected by the interactions of water droplets with the porous substrate during processes such as coating process. Three different mechanisms co-exist in the coating process: water spreading, absorption and evaporation. Disentangling the fundamental understanding of these phenomena can therefore be crucial for achieving a higher quality of the products (e.g. a longer shelf-life of the tablets) and for controlling the efficiency of the process. This paper aims to investigate the spreading and absorption mechanisms after droplet impingement on a tablet using a Lattice-Boltzmann methodology. Our numerical results (droplet height and spreading, penetration depth and absorbed volume) are in a good agreement with experimental data and numerical simulations available in the literature. In particular, the spreading phase is characterised by the capillary spreading time scale, as confirmed by previous studies. In contrast to previous studies, we find that the absorption process begins at times shorter than the capillary spreading time but with a different power-law in the absorbed volume. We explain this behaviour through a modified Washburn law that takes into account three-dimensional effects. Our data can be used as a benchmark to test novel mathematical models.

scholarly journals Revealing How Topography of Surface Microstructures Alters Capillary Spreading

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yaerim Lee ◽  
Naoto Matsushima ◽  
Susumu Yada ◽  
Satoshi Nita ◽  
Takashi Kodama ◽  
...  
Keyword(s):  
Capillary Spreading ◽  
Surface Microstructures

scholarly journals Fluctuation assisted spreading of a fluid filled elastic blister

2018 ◽  
Vol 846 ◽  
pp. 1076-1087 ◽  
Author(s):  
Andreas Carlson
Keyword(s):  
Numerical Simulations ◽  
Viscous Flow ◽  
Numerical Study ◽  
Solid Substrate ◽  
Precursor Film ◽  
Scaling Analysis ◽  
Elastic Bending ◽  
Spatially Extended ◽  
Elastic Interface ◽  
Capillary Spreading

In this theoretical and numerical study, we show how spatially extended fluctuations can influence and dominate the dynamics of a fluid filled elastic blister as it deforms onto a pre-wetted solid substrate. To describe the blister dynamics, we develop a stochastic elastohydrodynamic framework that couples the viscous flow, the elastic bending of the interface and the noise from the environment. We deploy a scaling analysis to find the elastohydrodynamic spreading law $\hat{R}\sim \hat{t}^{1/11}$, where $\hat{R}$ is the spreading radius and $\hat{t}$ is time, a direct analogue to the capillary spreading of drops, while the inclusion of noise in our model highlights that the dynamics speeds up significantly $\hat{R}\sim \hat{t}^{1/6}$ as local changes in curvature at the spreading front enhance the peeling of the elastic interface from the substrate. These fluctuations have a pronounced influence on the shape of the deforming blister and lead to the formation of a precursor film similar to a perfectly wetting droplet. Moreover, our analysis identifies a distinct criterion for the transition between the deterministic and the stochastic spreading regime, which is further illustrated by numerical simulations.

Electrowetting Film Formation and Capillary Spreading in Dielectrics: A Theoretical Approach

2007 ◽  
Vol 2 (4) ◽  
pp. 327-333
Author(s):  
C.E. Ekuma . ◽  
N.E. Idenyi . ◽  
F.K. Onwu . ◽  
A.E. Umahi .
Keyword(s):  
Theoretical Approach ◽  
Film Formation ◽  
Capillary Spreading

Capillary Spreading of Liquid Drops on Solid Surfaces

1997 ◽  
Vol 195 (1) ◽  
pp. 66-76 ◽  
Author(s):  
Rachid Chebbi ◽  
M.Sami Selim
Keyword(s):  
Solid Surfaces ◽  
Liquid Drops ◽  
Capillary Spreading
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