Mode Selection in the Spontaneous Motion of an Alcohol Droplet

Details Mode Selection in the Spontaneous Motion of an Alcohol Droplet Mode Selection in the Spontaneous Motion of an Alcohol Droplet

2005-02-21

arxiv.org/abs/nlin/0502045v3

Phys. Rev. E, 71, 065301 (2005)

Nonlinear Sciences

Adaptation and Self-Organizing Systems

4 pages, 5 figures

Scientific paper

10.1103/PhysRevE.71.065301

An alcohol (pentanol) droplet exhibits spontaneous agitation on an aqueous solution, driven by a solutal Marangoni effect. We found that the droplet's mode of motion is controlled by its volume. A droplet with a volume of less than $0.1 \mu\rm{l}$ shows irregular translational motion, whereas intermediate-sized droplets of $0.1-200 \mu\rm{l}$ show vectorial motion. When the volume is above $300 \mu\rm{l}$, the droplet splits into smaller drops. These experimental results regarding mode selection are interpreted in terms of the wave number selection depending on the droplet volume.

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