Abstract
The average dynamics of two immiscible fluids of different densities in a rectangular cavity oscillating horizontally with a high frequency are investigated experimentally. The fluids are characterized by a small surface tension coefficient. The regularities of the quasi-steady spatial relief formation on the fluid interface are studied. It is shown that, in addition to the capillary and vibrational parameters, the pattern excitation threshold is determined by the dimensionless vibration frequency. In the limit of high dimensionless frequency, good agreement with the well-known theoretical results is obtained.
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