Distribution of gyrotactic micro-organisms in a round jet
Understanding the distribution of gyrotactic micro-organisms in a jet is significant for environmental and ecological risk assessments associated with harmful algae blooms in lakes,estuaries,reservoirs.Presented in this paper are a laboratory observation and a numerical simulation for suspensions of Heterosigma akashiwo(H.akashiwo)in a round jet.A mathematical model was applied to predict the cell's migration in the round jet,based on the combination of Fokker-Planck equation and the Monte Carlo method.Results show that cells accumulate symmetrically with respect to the axis of the jet and that a distribution of inverted triangle appears for swimming cells near the free-water surface.However,no obvious accumulation was observed for passive particles,which means cell's swimming plays an important role in the distribution of micro-organisms in the round jet.Numerical results of cell distribution are in good agreement with the observations by the planar laser-induced fluorescence technology.
Complex flow Gyrotactic micro-organism Heterosigma akashiwo Round jet
CHEN Xiao ZENG Li WU Yi-hong YANG Yu
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of W State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of W
国内会议
江苏无锡
英文
305-318
2021-10-29（万方平台首次上网日期，不代表论文的发表时间）