Abstract
A possibility of visualizing flows using random inhomogeneities of film thicknesses of different colors as particles for visualization is shown on an example of a vortex flow structure in an oscillating thin liquid film. Formation of vortex flows in a thin liquid film containing surface-active substances is investigated in experiments. The film is fixed horizontally along the edges of the cell vibrating in the vertical direction. Spatially homogeneous oscillations of the liquid film can excite different types of waves that generate two-dimensional vortex flows due to nonlinearity. We present results of experimental investigation of the structure of vortex flows in a thin film (0.5–10 μm) with rectangular boundaries. It has been revealed that, if the horizontal size of an inhomogeneous region is much smaller than the size of vortices, the inhomogeneities are transported by vortices and their interference pattern can be used for visualization of vortex flows.
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Sergey V. Kiyashko: He received his B. Sc. Degree in physics in 1969 from the University of Nizhny Novgorod (Russia) and his Ph.D. in radio physics in 1980 from the Gorky Research Institute of Radio Physics. He worked at the Gorky Research Institute of Radio Physics from 1969 to 1977. Since 1977 he has been with the Institute of Applied Physics of the Russian Academy of Sciences. His research interests cover radio physics, wave interaction in active media, fluid mechanics.
Alexander V. Nazarovsky: He received his M. Sc. Degree in physics in 1998 from the University of Nizhny Novgorod (Russia). He has been with the Institute of Applied Physics of the Russian Academy of Sciences since 1998. His research interests are nonlinear oscillations and waves, theory of dynamic systems and chaos, fluid mechanics, radio physics.
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Kiyashko, S.V., Nazarovsky, A.V. Visualization of two-dimensional vortex flows in thin oscillating liquid films. J Vis 6, 53–58 (2003). https://doi.org/10.1007/BF03180964
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DOI: https://doi.org/10.1007/BF03180964