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The effects of ultrasound on the dynamics of an air-water meniscus in a planar micro-geometry are investigated experimentally.

Traveling waves

With low excitation intensities, traveling waves are found at the meniscus. Crests A and B are moving towards the center of symmetry of the meniscus.


Standing waves

Increasing the actuation intensity, standing waves with larger amplitude appear, which can be subharmonic, harmonic or superharmonic of the excitation frequecny. To the best of knowledge, this is the first time that superharmonic waves are observed on a gas-liquid interface.

Funding: National Science Foundation CAREER grant 0449269

Publications:

  • Xu J. and Attinger D, Acoustic excitation of superharmonic capillary waves on a meniscus in a planar micro-geometry,  Physics of Fluids, Vol 19, pp 108107 2007.
  • Xu J. and Attinger D, Control and ultrasonic actuation of a gas-liquid interface in a microfluidic chip,  Journal of Micromechanics and Microengineering, Vol 17 pp 609-616 2007.