Longitudinal dispersion of micro-organisms in a turbulent open-channel flow

摘要：

　　The longitudinal dispersion of micro-organisms in a turbulent open-channel flow is significant for understanding various ecological phenomena associated with the water conveyance process in an open channel.This paper analyses micro-organisms migration in a fully developed open-channel flow with the logarithmic velocity distribution.The migration velocity and longitudinal dispersivity of a micro-organisms cloud are analyzed based on Aris'concentration moment method.Results show that the strong swimming velocity can result in the non-monotonous variation of longitudinal dispersion coefficient and velocity of centred motion during the initial stage,enhance the centred motion,and weaken the longitudinal dispersion of micro-organisms during the stable stage.The concentration distribution of micro-organisms concentration is illustrated and analyzed using the Edgeworth expansion.The strong cell swimming in the vertical direction can accumulate micro-organisms near the free-water surface,while the weak cell swimming tends to make uniform distribution across the channel.

关键词： Longitudinal dispersion Turbulent flow Micro-organisms

作者: YANG Fang-yu CHEN Xiao GUAN Ming-yang YANG Yu CHEN Bin ZENG Li

作者单位: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of W Development Research Center of the Ministry of Water Resources of P.R.China,Beijing,100038,China College of Engineering,Peking University,Beijing,100871,China State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University

会议类型: 国内会议

会议名称: 第十六届全国水动力学学术会议暨第三十二届全国水动力学研讨会

会议地点: 江苏无锡

会议语种:英文

页码: 296-304

在线出版日期: 2021-10-29（万方平台首次上网日期，不代表论文的发表时间）