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- Title
Impeller diameter and submergence effects in solids drawdown with up-pumping impellers.
- Authors
Myers, Kevin J.; Pandit, Anand K.; Janz, Eric E.; Fasano, Julian B.
- Abstract
Floating solids drawdown speeds of up-pumping pitched-blade and hydrofoil impellers increase with increasing impeller submergence, with the pitched-blade speed increasing more rapidly than that of the hydrofoil. For submergences greater than 40 % of the vessel diameter, performance of the pitched-blade impeller is adversely affected by the discharge flow impinging on the vessel wall rather than the free liquid surface. Drawdown speeds of both impeller types decrease in a similar manner with increasing impeller diameter. For both impeller types, drawdown torque continually increases with increasing impeller diameter, while drawdown power exhibits a minimum at an intermediate impeller to tank diameter ratio; however, power is not a strong function of impeller diameter to tank diameter ratio over the range of this parameter typically used industrially (D/T ranging from 0.2 to 0.5 was studied in this work). Drawdown torque and power of the hydrofoil impeller are lower than those of the pitched-blade impeller, with the differences between the impeller types increasing rapidly with submergence.
- Subjects
SOLIDS; IMPELLERS
- Publication
Canadian Journal of Chemical Engineering, 2017, Vol 95, Issue 6, p1076
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.22766