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The mean flow field produced by a 45° pitched blade turbine: Changes in the circulation pattern due to off bottom clearance

 

作者: Suzanne M. Kresta,   Philip E. Wood,  

 

期刊: The Canadian Journal of Chemical Engineering  (WILEY Available online 1993)
卷期: Volume 71, issue 1  

页码: 42-53

 

ISSN:0008-4034

 

年代: 1993

 

DOI:10.1002/cjce.5450710107

 

出版商: Wiley Subscription Services, Inc., A Wiley Company

 

关键词: stirred tank;pitched blade impeller;LDA;flow visualization;refractive index correction

 

数据来源: WILEY

 

摘要:

AbstractThe impeller discharge stream and bulk circulation flow produced by a pitched blade turbine (PBT) in a fully baffled stirred tank have been defined, using a combination of flow visualization and laser Doppler anemometry measurement techniques. Two distinct bulk circulation patterns have been identified, one for higher off bottom clearances, and one for lower clearances. The circulation patterns are shown to have a substantial impact on the discharge stream, even very close to the edge of the impeller blades. These findings indicate that the action of the impeller is not independent of the tank geometry, but contains a substantial feedback component from the bulk flow. This conclusion has substantial implications for the modelling and prediction of stirred tank flow fields.

 

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