Factors of Pumping Capacity in Some Different Types of Channel Brownian Pumps  

作　　者：谢嘉泳 XIE Jiayong(School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China)

机构地区：[1]School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China

出　　处：《Journal of Donghua University(English Edition)》2023年第3期326-333,共8页东华大学学报（英文版）

基　　金：National Natural Science Foundation of China (No. 61975058);Blue Shield Technology Project,China (No. LD20170209)。

摘　　要：The motion of particles in different channel Brownian pumps can be described by Langevin equations,and the pumping capacity is a useful indicator to demonstrate the strength of a pump’s transportation ability.Via the simulation,there is always an optimal value of temperature and unbiased external force for different pumps which make the concentration ratio between the right tube and left tube derive its maximum and minimum in two asymmetric tubes respectively.Besides,the concentration ratio will keep 1 regardless of radius,temperature or magnitude of force in the tube in a symmetric tube.To obtain more information about pumping capacity,exploring the average probability current(APC) of tubes in different conditions is necessary.Results indicate that as the concentration ratio is 1,the change of the APC when x_(0)=0 is similar to that when x_(0)=π.Also,when the concentration ratio is more than 1,there are optimal values of temperature,radius and magnitude of force where the APC gains a maximum,and the maximum decreases as the concentration in the right tube increases when x_(0)=0.

关 键 词：Brownian pump pumping capacity unbiased external force average probability current(APC) 

分 类 号：O41[理学—理论物理]