The Geometric Properties of Spilling Breakers in the Presence of Ambient Surfactants

Physics – Fluid Dynamics

Scientific paper

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Scientific paper

Spilling breakers in the presence of an ambient surfactant, Triton X-100, are studied experimentally. Five different spilling breakers with various wave frequencies and amplitudes were generated mechanically in a tank that is 14.8 m long, 1.2 m wide and 1.0 m deep. For each wave, the evolution of the wave crest profile was measured with a photographic technique that employs fluorescent dye, a laser light sheet and a high-speed digital camera. The dynamical properties of the water surface including surface tension, surface viscosity and surface dilatational elasticity were monitored with an in-situ longitudinal wave propagation device. With a relatively clean water surface, the breaking process is dominated by surface tension and begins with the formation of a round bulge and capillary waves at the wave crest. In the presence of Triton X-100, the bulge is flat and the geometric size of the bulge decreases as the bulk concentration of Triton X-100 increases. As the concentration of Triton X-100 approaches the critical micelle concentration, a small plunging jet is formed at the wave crest. The size of the jet varies with the frequency of the breaking waves.

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