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Hydrodynamic model for a hypolimnetic aerator
SUN Xin 1 * #,DUAN Feifei 2,LIU Wei 2,HUANG Tinglin 2,ZHANG Wushou 2,CONG Haibing 2
1.Schoold of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology
2.Schoold of Environmental and Municipal Engineering, Xi\'an University of Architecture and Technology
*Correspondence author
#Submitted by
Subject: Municipal Engineering
Funding: pecialized Research Fund of Educational Commission of Shaanxi Province(No.11JK0954), Specialized Research Fund for the Doctoral Program of Higher Education(No.20106120120012), Science and Technology Research and Development Program of Shanxi Province (No.2010K11-02-03), National Natural Science Foundation of China (No.No.51178379, 51278404)
Opened online: 7 January 2014
Accepted by: none
Citation: SUN Xin,DUAN Feifei,LIU Wei.Hydrodynamic model for a hypolimnetic aerator[OL]. [ 7 January 2014] http://www.paper.edu.cn/lwzx/en_releasepaper/content/4579050
The water velocity in the aeration chamber of a hypolimnetic aerator directly influences the efficiency of mixing and oxygenation in the hypolimnion, and consequently the effect of water quality improvement. Based on the energy balance between the energy input and the energy loss for the gas-liquid two-phase flow in the aeration chamber, a one-dimensional hydrodynamic model for the aeration chamber was developed. Various types of energy loss were analyzed, an equation for the energy loss due to the wakes was particularly proposed. The average gas holdup and water velocity in the riser of the aeration chamber were predicted by solving the developed model with the reeal-domain method of MATLAB. Sensitivity analysis of the model parameters showed that the prediction results were greatly dependant on the flow resistance coefficient at the top and the coefficient due to local disturbances at the entrance and exit. Using optimized parameters, both gas holdup and water velocity were well predicted within ±7% and ±15% of the measured ones respectively. Developed hydrodynamic model for the aeration chamber can be used to accurately predict the average water velocities under different air flowrates in the aeration chamber, and can be used to design and optimize the hypolimnetic aerator.
Keywords:Hypolimnetic aerator;hydrodynamic model;water velocity;prediction

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