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Modeling and analysis of airlift pumping system based on momentum theorem |
HU Dong, TANG Chuan-Lin, LIAO Zhen-Fang |
(1. College of Mechanical Engineering, Hunan University of Technology, Zhuzhou, Hunan 412008, China; 2. College of Mechanical Engineering, Chongqing University, Chongqing 401331, China) |
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Abstract In order to look for a new method to establish theoretical models for airlift pumping systems, the mixture flow governing equations were constructed for an airlift pump based on the momentum theory, and the relations among the volumetric fluxes of air, water and solid were obtained numerically by using linearization approach, theoretical analysis and empirical formulas. A river sand airlift pumping system was built in laboratory, and ordinary river sands of medium size were selected as test solid particles to investigate the reliability of the model. The relations between volumetric fluxes of both water and solid and that of air were obtained experimentally and were compared with that evaluated by the theoretical model. It showed that many complicated factors had effect on the model, and therefore it had to be linearized to make the flow parameters prediction easier. The model exhibited a good accuracy for water volumetric flux prediction and the relative errors were almost less than 8%, while slightly poor for solid volumetric flux prediction. Moreover, the model presented more accurately for air / water two phase pumping system and the relative errors were less than 6%. In addition, the theoretical evaluation matched well with the experimental observation at moderate air volumetric flux, while showed slightly poor under other conditions especially at its peak values. The results can provide an important reference for understanding and optimizing various parameters of airlift pumping systems.
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Received: 21 October 2011
Published: 30 September 2012
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