CFD simulation of gas--liquid rotational and perforated concurrent flows
on the blade unit of a TRST
Abstract
The blade unit of a tridimensional rotational flow sieve tray (TRST) is
the origin for the rotational–perforated flow. The flow field of that
was investigated using the Multi-fluid VOF method. The water fractions,
and the gas perforation velocity on the blade unit were investigated.
The liquid phase distribution in the jet and mixed flow is more
dispersed than that in film and jet flow. The gas–liquid two-phase
velocity fluctuated with the radial distance. The rotational and
perforated flows on the blade unit were analyzed separately by the local
rotational flow ratio . The variation range of the ratio for the
gas-phase was 0.6 – 0.85, and that for the liquid-phase is 0.2 – 0.8.
Based on the Q criterion, the vortices were mainly concentrated near the
sieve holes. The simulation provides an important theoretical basis for
the mass transfer investigation and structural optimization of the blade
unit.