Cavity configuration, flooding and pumping capacity of disc-type turbines in aerated stirred tanks
✍ Scribed by Wei-Ming Lu; Shin-Jon Ju
- Book ID
- 103007244
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 880 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0009-2509
No coin nor oath required. For personal study only.
✦ Synopsis
Cavity configuration, flooding condition, and pumping capacity of aerated disc-type turbines were measured as a function of operating conditions using a constant temperature anemometer. Experimental results reveal that the number of large cavities may be one, two, or three for a 6-blade turbine. The large and small cavities form a three-three structure in the case of three large cavities, but no interchange of positions was observed. However, this interchange was observed in the cases of one and two large cavities at a high impeller rotational speed. The flooding condition was determined from the two end points of the hysteresis loop of the impeller discharge velocity when impellers were operated between flooding and dispersing conditions. The correlating equations obtained are: QL=1.25 x 10-3(P,/V)o-~"(~/Z-)'~31(2-Q/DJ)o~28 3.5 N,= A(Z-,D)T(gQ/D+(4.07+ 1.21n,-0.147n;)
where A = 0.072 for the highest limit of impeller flooding and A = 0.064 for the lowest limit of gas dispersion.
The flooding correlation is in close agreement with the newest published data.