Influence of contactor geometry and draft tube configuration on the cycle time distribution in sawdust conical spouted beds

- The draft tubes provide a great versatility in the cycle times.
- The open-side tube gives way to a great number of short cycles.
- Contactor angle is the parameter of greater influence on the cycle time.
- The longer average cycles times are recorded with the nonporous draft tube.
- The open-sided tube provides stability and ensures high turbulence to beds.