Comparison of Power Number for Paddle-Type Impellers by Three Methods

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Chen Zou²  Pei-qing Yu²  Jian-ye Xia¹  Ming-hui Xie¹  Guo-zhong Zhou²  Si-liang Zhang¹ 

[1] State Key Laboratory of Bioreactor Engineering, College of Biotechnology, East China University of Science and Technology;Wenzhou Great Wall Mixer Design Institute

关键词: Power Number;    Empirical Correlations;    Computational Fluid Dynamics;    Paddle Impeller;   

DOI  :  10.1252/jcej.11we115

来源: Maruzen Company Ltd

【 摘 要 】

References(8)Cited-By(1)Power numbers in a baffled stirring tank with paddle-type impellers were measured over a range of Reynolds numbers, from laminar- to turbulent-flow regions. The impellers studied included a two-blade flat-paddle impeller, a 45° two-blade pitched-paddle impeller, a 45° four-blade pitched-blade turbine, and a two-stage pitched-blade turbine. The impeller-diameter-to-tank-diameter ratio was 0.5 to 0.6. The measured power numbers were compared with those derived from two other methods: prediction by using correlations and computational fluid dynamics (CFD). Power number correlations showed that the values estimated from the empirical correlations proposed by Nagata agreed closely with those measured in the laminar-flow region but deviated significantly in the transitional- and turbulent-flow regions. The power numbers derived from the correlation proposed by Kamei and Hiraoka agreed well with the experimental results in the laminar- and turbulent-flow regions. The power number in a stirring tank was also simulated by the CFD method. The numerical results showed satisfactory agreement with the experimental data over a wide range of Reynolds numbers.

【 授权许可】

Unknown