Dynamic wetting angle of a spreading droplet

The dynamic contact angle is required as a boundary condition for modelling problems in capillary hydrodynamics, including certain stages of the droplet impact problem. The dynamic contact angle differs appreciably from the static advancing or receding values, even at low velocities. This paper pres...

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Bibliographic Details
Published in:Experimental thermal and fluid science 2005-08, Vol.29 (7), p.795-802
Main Authors: Šikalo, Š., Tropea, C., Ganić, E.N.
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Condensed matter: structure, mechanical and thermal properties
Contact angle
Drop impact
Droplets
Drops and bubbles
Dynamic contact angle
Dynamics
Exact sciences and technology
Fluid dynamics
Fluid flow
Fundamental areas of phenomenology (including applications)
Mathematical models
Nonhomogeneous flows
Physics
Solid-fluid interfaces
Spreading
Spreads
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Wetting
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Description
Summary:The dynamic contact angle is required as a boundary condition for modelling problems in capillary hydrodynamics, including certain stages of the droplet impact problem. The dynamic contact angle differs appreciably from the static advancing or receding values, even at low velocities. This paper presents experimental results of the dynamic contact angle of spreading droplets after impacting on horizontal and inclined surfaces. Droplets of an 85% (vol.) glycerin/water solution ( D = 2.45 mm) and water ( D = 2.7 mm) were used in the study. Two surfaces, wax (low wettable) and glass (high wettable) are used, to study the effect of surface wettability (static contact angle). The results include the dynamic contact angle of droplets together with the contact line velocity and the dimensionless spread factor as a function of time.
ISSN:0894-1777
1879-2286
DOI:10.1016/j.expthermflusci.2005.03.006