Abstract
In a vertically oscillating circular cylindrical container, singular perturbation theory of two-time scale expansions is developed in weakly viscous fluids to investigate the motion of single free surface standing wave by linearizing the Navier-Stokes equation. The fluid field is divided into an outer potential flow region and an inner boundary layer region. The solutions of both two regions are obtained and a linear amplitude equation incorporating damping term and external excitation is derived. The condition to appear stable surface wave is obtained and the critical curve is determined. In addition, an analytical expression of damping coefficient is determined. Finally, the dispersion relation, which has been derived from the inviscid fluid approximation, is modified by adding linear damping. It is found that the modified results are reasonably closer to experimental results than former theory. Result shows that when forcing frequency is low, the viscosity of the fluid is prominent for the mode selection. However, when forcing frequency is high, the surface tension of the fluid is prominent.
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Communicated by DAI Shi-qiang
Project supported by the National Natural Science Foundation of China (Nos.19772063, 19772068) and the Doctoral Research Fund of the Ministry of Education (No.20010141024)
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Jian, Yj., Xue-quan, E. & Zhang, J. Damping of vertically excited surface wave in weakly viscous fluid. Appl Math Mech 27, 417–424 (2006). https://doi.org/10.1007/s10483-006-0319-1
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DOI: https://doi.org/10.1007/s10483-006-0319-1