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Viscous fingering in volatile thin films.

¹The Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 28, 2009

Summary

This summary is machine-generated.

Water films on mica exhibit a phase transition. Evaporation induces fingering instability, similar to the Saffman-Taylor problem, revealing new dynamics in thin film evaporation.

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Area of Science:

Physics
Materials Science
Physical Chemistry

Background:

Thin water films on mica substrates can transition between distinct thickness states.
Evaporation introduces complex interface dynamics in confined fluid systems.

Purpose of the Study:

To investigate the fingering instability in evaporating thin water films.
To establish a connection between thin film phase transitions and the Saffman-Taylor instability.
To develop theoretical solutions for the dynamics of evaporation in this system.

Main Methods:

Observing phase transitions in thin water films on cleaved mica.
Inducing controlled evaporation to study interface dynamics.
Applying concepts from the Saffman-Taylor problem to analyze the observed fingering instability.

Main Results:

A first-order phase transition in water film thickness was observed.
Fingering instability at the interface between different film thicknesses was induced by evaporation.
The observed instability was shown to be analogous to the Saffman-Taylor problem.

Conclusions:

Evaporation-driven phase transitions in thin water films exhibit Saffman-Taylor-like fingering.
Theoretical solutions can describe the dynamics of such evaporating systems.
This work links interfacial phenomena in thin films to classical fluid dynamics problems.