Two-perspective fluorescence analysis of droplets creeping down a tilted plate

Two-perspective fluorescence analysis of droplets creeping down a tilted plate Many experimental techniques have been developed and applied to investigate hydrodynamics of liquid films and single droplets on solid substrates. A simple but reliable measurement technique has been recently proposed to quantify thickness and apparent contact angles of droplets and rivulets (Hagemeier et al. Exp Fluids 52(2):361–374, 2012). However, this technique leads to ambiguities for any contact angle exceeding 90°. An improved version has thus been derived to solve the most important issues associated with the original method. For this purpose, top and sideways two-perspective images are acquired simultaneously, both relying on fluorescence. Analyzing the data obtained from both views, a correlation between fluorescence intensity and droplet shape can be derived. Furthermore, advancing and receding contact angles can be determined in this manner. A new and particularly important feature of the improved technique is the estimation of the contact line velocity at various locations, all around the moving droplet. The in-plane velocity components show a clear dependency on the Bond number and on the position around the droplet circumference. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Two-perspective fluorescence analysis of droplets creeping down a tilted plate

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-013-1639-7
Publisher site
See Article on Publisher Site

Abstract

Many experimental techniques have been developed and applied to investigate hydrodynamics of liquid films and single droplets on solid substrates. A simple but reliable measurement technique has been recently proposed to quantify thickness and apparent contact angles of droplets and rivulets (Hagemeier et al. Exp Fluids 52(2):361–374, 2012). However, this technique leads to ambiguities for any contact angle exceeding 90°. An improved version has thus been derived to solve the most important issues associated with the original method. For this purpose, top and sideways two-perspective images are acquired simultaneously, both relying on fluorescence. Analyzing the data obtained from both views, a correlation between fluorescence intensity and droplet shape can be derived. Furthermore, advancing and receding contact angles can be determined in this manner. A new and particularly important feature of the improved technique is the estimation of the contact line velocity at various locations, all around the moving droplet. The in-plane velocity components show a clear dependency on the Bond number and on the position around the droplet circumference.

Journal

Experiments in FluidsSpringer Journals

Published: Dec 6, 2013

References

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