Wetting and dewetting processes in the axial retraction of liquid filaments

Pablo D. Ravazzoli, Ingrith Cuellar, Alejandro G. González, and Javier A. Diez
Phys. Rev. E 95, 053111 – Published 24 May 2017

Abstract

We study the hydrodynamic mechanisms involved in the motion of the contact line formed at the end region of a liquid filament laying on a planar and horizontal substrate. Since the flow develops under partially wetting conditions, the tip of the filament recedes and forms a bulged region (head) that subsequently develops a neck region behind it. Later the neck breaks up leading to a separated drop, while the rest of the filament restarts the sequence. One main feature of this flow is that the whole dynamics and final drop shapes are strongly influenced by the hysteresis of the contact angle typical in most of the liquid-substrate systems. The time evolution till breakup is studied experimentally and pictured in terms of a hybrid wettability theory which involves the Cox-Voinov hydrodynamic approach combined with the molecular kinetic theory developed by Blake. The parameters of this theory are determined for our liquid-substrate system (silicone oil–coated glass). The experimental results of the retracting filament are described in terms of a simple heuristic model and compared with numerical simulations of the full Navier-Stokes equations. This study is of special interest in the context of pulsed laser-induced dewetting.

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  • Received 16 March 2017

DOI:https://doi.org/10.1103/PhysRevE.95.053111

©2017 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Pablo D. Ravazzoli, Ingrith Cuellar, Alejandro G. González, and Javier A. Diez

  • Instituto de Física Arroyo Seco, Universidad Nacional del Centro de la Provincia de Buenos Aires, and CIFICEN-CONICET-CICPBA, Pinto 399, 7000 Tandil, Argentina

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Issue

Vol. 95, Iss. 5 — May 2017

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