scholarly journals Coalescence of polymeric sessile drops on a partially wettable substrate

2021 ◽  
Vol 33 (12) ◽  
pp. 123101
Author(s):  
Sarath Chandra Varma ◽  
Aniruddha Saha ◽  
Aloke Kumar
Keyword(s):  
Sessile Drops

On the compound sessile drops: configuration boundaries and transitions

2021 ◽  
Vol 917 ◽  
Author(s):  
Chun-Yu Zhang ◽  
Peng Gao ◽  
Er-Qiang Li ◽  
Hang Ding
Keyword(s):  
Sessile Drops

Abstract

scholarly journals Sharp transition between coalescence and non-coalescence of sessile drops

2014 ◽  
Vol 743 ◽  
Author(s):  
Stefan Karpitschka ◽  
Hans Riegler
Keyword(s):  
Contact Region ◽  
Threshold Value ◽  
System Control ◽  
Arithmetic Means ◽  
Liquid Body ◽  
Molecular Diffusivity ◽  
Experimental Resolution ◽  
Miscible Liquids ◽  
Phase Angles ◽  
Sessile Drops

AbstractUnexpectedly, under certain conditions, sessile drops from different but completely miscible liquids do not always coalesce instantaneously upon contact: the drop bodies remain separated in a temporary state of non-coalescence, connected through a thin liquid bridge. Here we investigate the transition between the states of instantaneous coalescence and temporary non-coalescence. Experiments reveal that it is barely influenced by viscosities and absolute surface tensions. The main system control parameters for the transition are the arithmetic means of the three-phase angles, $\overline{\Theta }_{a}$, and the surface tension differences $\Delta \gamma $ between the two liquids. These relevant parameters can be combined into a single system parameter, a specific Marangoni number $\widetilde{M}=3\Delta \gamma /(2\overline{\gamma }\overline{\Theta }_{a}^2)$. This $\widetilde{M}$ universally characterizes the coalescence transition behaviour as a function of both the physicochemical liquid properties and the shape of the liquid body in the contact region. The transition occurs at a certain threshold value $\widetilde{M}_t$ and is sharp within the experimental resolution. The experimentally observed threshold value of $\widetilde{M}_t\approx 2$ agrees quantitatively with values obtained by simulations assuming realistic material parameters. The simulations indicate that the absolute value of $\widetilde{M}_t$ very weakly depends on the molecular diffusivity.

Controlling flow patterns in oscillating sessile drops by breaking azimuthal symmetry

2011 ◽  
Vol 99 (15) ◽  
pp. 154102 ◽  
Author(s):  
Dileep Mampallil ◽  
Dirk van den Ende ◽  
Frieder Mugele
Keyword(s):  
Flow Patterns ◽  
Azimuthal Symmetry ◽  
Sessile Drops

Convective Rolls and Hydrothermal Waves in Evaporating Sessile Drops

Langmuir ◽  
2012 ◽  
Vol 28 (31) ◽  
pp. 11433-11439 ◽  
Author(s):  
George Karapetsas ◽  
Omar K. Matar ◽  
Prashant Valluri ◽  
Khellil Sefiane
Keyword(s):  
Convective Rolls ◽  
Sessile Drops
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