Abstract
The hydrodynamics, viz. the solids circulation patterns and
bubble behavior, of a freely bubbling gas-solid fluidized bed
has been investigated experimentally using Particle Image
Velocimetry (PIV) combined with Digital Image Analysis
(DIA). Coupling of these non-invasive measuring techniques
allows us to obtain information on both the bubble behavior
and emulsion phase circulation patterns simultaneously, in
order to study in detail their intricate interaction. In
particular, the combination of DIA with PIV allows correcting
for the influence of particle raining through the roof of the
bubbles on the time-averaged emulsion phase velocity
profiles. Because of the required visual access, this technique
can only be applied for pseudo-2D fluidized beds.
The bubble rise velocity as a function of the equivalent
bubble diameter and the average bubble diameter as a
function of the position above the distributor were
determined with DIA and compared with literature
correlations. Subsequently, the importance was demonstrated
of filtering the instantaneous emulsion phase velocity profiles
obtained with PIV for particle raining, using DIA, to obtain
the time-averaged emulsion phase velocity profiles. The timeaveraged
solids circulation patterns have been studied as a
function of the superficial gas velocity and bed aspect ratio
| Original language | Undefined |
|---|---|
| Number of pages | 10 |
| Publication status | Published - 2008 |
| Event | 6th International Conference on CFD in the Oil & Gas, Metallurgical and Process Industries 2008 - Trondheim, Norway Duration: 10 Jun 2008 → 12 Jun 2008 |
Conference
| Conference | 6th International Conference on CFD in the Oil & Gas, Metallurgical and Process Industries 2008 |
|---|---|
| Country/Territory | Norway |
| City | Trondheim |
| Period | 10/06/08 → 12/06/08 |
| Other | 10-12 June 2008 |
Keywords
- IR-68590
- PIV
- Hydrodynamics
- DIA
- fluidized bed