Vibration effect on Rayleigh–Taylor instability of sedimenting suspension

• DOI: 10.1063/5.0190915
• Publication Date: 2024-03-05T16:18:15Z
• Authors: Senlin Zhu; Jianjun Tao
• Keywords: Suspension; Dispersion relation; Rayleigh–Taylor instability; Wavenumber

In this paper, the effect of vertical vibration on Rayleigh–Taylor instability at lower interface a sedimenting suspension layer sandwiched between viscous fluids is studied numerically and theoretically. It shown that suppresses amplitudes perturbations enlarges widths granular fingers, postponing nonlinear growth stage. By modeling as fluid with its effective density viscosity, stability analyses are carried out, dominant rate wave number predicted by dispersion relation agree numerical results, especially for cases strong vibrations. Because small-scale flow induced particles, high acceleration amplitude low frequency, which correspond to large power input, increase kinetic energy spectra regime, phenomenon contrary pure cases.