title: Comparing the performances of circular ponds with different impellers by CFD simulation and microalgae culture experiments.
abstract: In this study, a numerical simulation using computational fluid dynamics (CFD) was used to investigate the hydrodynamic characteristics of circular ponds with three different impellers (hydrofoil, four-pitched-blade turbine, and grid plate). The reliability of the CFD model was validated by particle image velocimetry (PIV). Hydrodynamic analyses were conducted to evaluate the average velocity magnitude along the light direction (Uz), turbulence properties, average shear stress, pressure loss and the volume percentage of dead zone inside circular ponds. The simulation results showed that Uz value of hydrofoil was 58.9, 40.3, and 28.8% higher than those of grid plate with single arm, grid plate with double arms and four-pitched blade turbines in small-scale circular ponds, respectively. In addition, hydrofoil impeller with down-flow operation had outstanding mixing characteristics. Lastly, the results of Chlorella pyrenoidosa cultivation experiments indicated that the biomass concentration of hydrofoil impeller with down-flow operation was 65.2 and 88.8% higher than those of grid plate with double arms and four-pitched-blade turbine, respectively. Therefore, the optimal circular pond mixing system for microalgae cultivation involved a hydrofoil impeller with down-flow operation.
authors: State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Meilong Road 130, Mail Box 301, Shanghai, 200237, People's Republic of China.
authors: Chen
authors: C
authors: Meng
authors: Jianke
authors: J
authors: Huang
authors: Chunyu
authors: C
authors: Ye
authors: Wenchao
authors: W
authors: Cheng
authors: Jianpei
authors: J
authors: Chen
authors: Yuanguang
authors: Y
authors: Li
mesh_terms: D002708:Chlorella / Q000166:cytology*; D057446:Hydrodynamics; D061005:Ponds