Computational Mixing Time of Self-Induced Rotary Sloshing Caused by an Upward Liquid Jet in a Cylindrical Container

Abstract

　　　This paper attempts to seek the possibility for computationally estimate the mixing time of jet-induced rotary sloshing against the previous experimental result. Simulation technique employed in this study includes Computational Fluid Dynamics (CFD). Results for occurrence process and the period of the sloshing are successfully verified against our previous results. A lot of solid particles are then injected into the container as a tracer and tracked every time step for estimating the mixing time computationally. The particles injected move in the bath due to the hydrodynamic force, the added-mass force, the buoyancy force and the own weight, and the positions of the particles can be updated by solving the equation of motion of the particles with the use of a one-way coupling. For a low flow-rate condition of the inlet jet, the resulting computational mixing time is in agreement with the experimental result, introducing a short-time average of the particle dispersion ratio that successfully removes high frequency components in the signals.