This study employs the fluctuating-lattice Boltzmann method to investigate temperaturegradient-driven aggregation of microswimmers,specifically,pulling-type(pullers)and pushing-type(pushers),within a fluid confined by...This study employs the fluctuating-lattice Boltzmann method to investigate temperaturegradient-driven aggregation of microswimmers,specifically,pulling-type(pullers)and pushing-type(pushers),within a fluid confined by two channel walls.The analysis incorporates the Brownian motion of both swimmer types and introduces key dimensionless parameters,including the swimming Reynolds,Prandtl,and Lewis numbers,to characterize the influences of self-propulsion strength,thermal diffusivity,and Brownian diffusivity on aggregation efficiency and behavior.Our findings reveal that pushers tend to aggregate either along the channel centerline or near the channel walls under conditions of thermal gradients imposed by heated or cooled boundaries.Notably,pushers can be focused on the channel walls even under minimal temperature differences.In contrast,pullers exhibit sensitivity primarily to heated walls,a phenomenon for which a plausible explanation is proposed.Further analysis identifies the swimming Reynolds number as a critical determinant of aggregation efficiency and performance for both pullers and pushers.Additionally,the Prandtl number predominantly governs aggregation efficiency,while the Lewis number chiefly influences aggregation performance.展开更多
Nanoparticulate flows occur in a wide range of natural and engineering applications hence have received much attention. The purpose of the present paper is to provide a brief review on the research on the nanoparticul...Nanoparticulate flows occur in a wide range of natural and engineering applications hence have received much attention. The purpose of the present paper is to provide a brief review on the research on the nanoparticulate flow in some aspects which consist of the method of moment for solving the particle population balance equation, penetration efficiency, pressure drop and heat transfer in the turbulent nanoparticulate pipe flow, fluctuating-lattice Boltzrnann model for Brownian motion of nanoparticles.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12372251 and 12132015).
文摘This study employs the fluctuating-lattice Boltzmann method to investigate temperaturegradient-driven aggregation of microswimmers,specifically,pulling-type(pullers)and pushing-type(pushers),within a fluid confined by two channel walls.The analysis incorporates the Brownian motion of both swimmer types and introduces key dimensionless parameters,including the swimming Reynolds,Prandtl,and Lewis numbers,to characterize the influences of self-propulsion strength,thermal diffusivity,and Brownian diffusivity on aggregation efficiency and behavior.Our findings reveal that pushers tend to aggregate either along the channel centerline or near the channel walls under conditions of thermal gradients imposed by heated or cooled boundaries.Notably,pushers can be focused on the channel walls even under minimal temperature differences.In contrast,pullers exhibit sensitivity primarily to heated walls,a phenomenon for which a plausible explanation is proposed.Further analysis identifies the swimming Reynolds number as a critical determinant of aggregation efficiency and performance for both pullers and pushers.Additionally,the Prandtl number predominantly governs aggregation efficiency,while the Lewis number chiefly influences aggregation performance.
基金Project supported by the Major Program of National Natural Science Foundation of China(Grant No.11632016)
文摘Nanoparticulate flows occur in a wide range of natural and engineering applications hence have received much attention. The purpose of the present paper is to provide a brief review on the research on the nanoparticulate flow in some aspects which consist of the method of moment for solving the particle population balance equation, penetration efficiency, pressure drop and heat transfer in the turbulent nanoparticulate pipe flow, fluctuating-lattice Boltzrnann model for Brownian motion of nanoparticles.
