Abstract
We perform quantitative visualization experiments on the vertical (z-direction) motion of a spherical solid particle being lifted off a horizontal flat bottom due to laminar fluid flow generated by a revolving impeller. Describing the observed motion of the particle in terms of a constant vertical hydrodynamic force overcoming gravity and the lubrication force has limited success. For this reason we hypothesize that the hydrodynamic force on the particle quickly increases with its distance from the bottom. This hypothesis is supported by detailed numerical simulations of the flow around the particle. Integrating the equation of motion of the sphere with the vertical hydrodynamic force as a linear function of z derived from simulations provides an adequate description of the experimentally observed vertical motion of the particle.
Original language | English |
---|---|
Article number | e16886 |
Number of pages | 13 |
Journal | AIChE Journal |
Volume | 66 |
Issue number | 4 |
Early online date | 29 Dec 2019 |
DOIs | |
Publication status | Published - 1 Apr 2020 |
Bibliographical note
The financial support from the National Key R&D Program of China (2016YFB0302801), National Natural Science Foundation of China (No. 21676007), and the Fundamental Research Funds for the Central Universities (XK1802-1) are gratefully acknowledged.Keywords
- solids suspension
- quantitative visualization
- lubrication force
- particle-resolved simulation
- agitated flow
- PARTICLES
- STIRRED-TANK
- SLOW MOTION
- SUSPENSION
- BOLTZMANN
- VELOCIMETRY EXPERIMENTS
- BOUNDARY
- NUMERICAL SIMULATIONS
- EQUATION
- VISCOUS FLUID