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Influence of viscous force on the dynamic process of micro-sphere in optical tweezers

中国物理B:英文版 2023年第10期32卷 768-775页

作者：刘静吴星宇冯怡敏郑冕李志远 College of Computer Science South-Central Minzu UniversityWuhan 430074China China Ship Development and Design Center Wuhan 430064China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China

With the advantages of noncontact,high accuracy,and high flexibility,optical tweezers hold huge potential for micro-manipulation and force measurement.However,the majority of previous research focused on the state of the motion of particles in the optical trap,but paid little attention to the early dynamic process between the initial state of the particles and the optical trap.Note that the viscous forces can greatly affect the motion of micro-spheres.In this paper,based on the equations of Newtonian mechanics,we investigate the dynamics of laser-trapped micro-spheres in the surrounding environment with different viscosity coefficients.Through the calculations,over time the particle trajectory clearly reveals the subtle details of the optical capture process,including acceleration,deceleration,turning,and reciprocating oscillation.The time to equilibrium mainly depends on the corresponding damping coefficient of the surrounding environment and the oscillation frequency of the optical tweezers.These studies are essential for understanding various mechanisms to engineer the mechanical motion behavior of molecules or microparticles in liquid or air.

关键词： optical tweezers viscous force equations of Newtonian mechanics Runge–Kutta method

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Molecular force mechanism of hydrodynamics in clay nanopores

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浙江大学学报(英文版)A辑:应用物理与工程 2023年第9期24卷 817-827页

作者： Shengjie WEI Yuchao LI Peng SHEN Yunmin CHEN MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China

Nanopores are prevalent within various clay morphologies,and water flow in clay nanopores is significant for various engineering applications.In this study,we performed non-equilibrium molecular dynamics(NEMD)simulations to reveal the molecular force mechanisms of water flow in clay nanopores.The water dynamic viscosity,slip length,and average flow velocity were obtained to verify the NEMD models.Since the water confined in the nanopores maintained a dynamic mechanical equilibrium state,each water lamina can be regarded as a simply supported beam.The applied driving force,the force from clay crystal layers,the force from compensating sodium ions,and the force from other water laminae were further calculated to investigate the force mechanisms.The van der Wals barrier above the surface and hydraulic gradient lead to distribution differences in water oxygen atoms,which contribute to a net van der Waals resistance component of the force from clay crystal layers.Meanwhile,the water molecules tend to rotate to generate the electrostatic resistance component of the force from clay crystal layers and balance the increasing hydraulic gradient.Due to the velocity difference,the water molecules in the slower lamina have a higher tendency to lag and generate a net electrostatic resistance force as well as a net van der Waals driving force on the water molecules in the faster lamina,which together make up the viscous force.

关键词： Molecular dynamics Hydrodynamics Clay Nanopore Molecular force Boundary effect viscous force

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Mechanisms Underlying the Biological WetAdhesion:Coupled Effects of Interstitial Liquid and Contact Geometry

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Journal of Bionic Engineering 2020年第3期17卷 448-456页

作者： Jing Li Jun Liu Chuandong Ma Jiaxin Ji Jianlin Liu College of Mechanical and Electrical Engineering China University of Petroleum(East China)Qingdao 266580China College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580China

Wet adhesion is widely adopted in biological adhesion systems in nature,and it is beneficial to design new materials with desired properties based on the underlying physics of wet adhesion.The aim of this work is to develop a design criterion to regulate the wet adhesion.The effects of different contact shapes(flat and sphere)and morphologies of the substrate(smooth,microstructure and nanostructure)on the adhesion force are investigated.Combining with the theoretical models,the dominated factors in the separation process and isolating the viscous contributions from the capillary interactions are evaluated.The results demonstrate that the adhesion mechanisms depend significantly on the capillary numbers of the interstitial liquid and the contact geometry,and the ratio of capillary force to viscous force is a key to regulate the wet adhesion mechanism.These findings can not only explain some phenomena of wet adhesion to organisms,but also provide some inspirations to design new adhesion technology for robotic fingers that can grasp objects in wet environments.

关键词： wet adhesion capillary force viscous force adhesion mechanism

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Analysis of liquid bridge between spherical particles

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China Particuology 2007年第6期5卷 420-424页

作者： Fusheng Mu Xubin Su College of Mechanical and Electrical Engineering Central South University Changsha 410083 China

A pair of central moving spherical particles connected by a pendular liquid bridge with interstitial Newtonlan fluid is otten encountered in particulate coalescence process. In this paper, by assuming perfect-wet condition, the effects of liquid volume and separation distance on static liquid bridge are analyzed, and the relation between rupture energy and liquid bridge volume is also studied. These points would be of significance in industrial processes related to adhesive particles.

关键词： Surface-wet Liquid bridge force Rupture energy viscous force

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viscous forceS BETWEEN TWO SPHERES COLLIDING THROUGH INTERSTITIAL POWER-LAW FLUID

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Particuology 2005年第Z1期 52-57+5页

作者： Yong Xu, Hongyan Li and Wenbin Huang Department of Applied Mechanics, China Agricultural University, Beijing 100083, P. R. China Department of Transport Engineering, Shandong University of Technology, Zibo 255049, P. R. China

Interaction between two spheres with an interstitial fluid is essential in Discrete Element modeling for simulating the behaviors of ’wet’ particulate materials. In this paper the interaction between two spheres with an interstitial Power-law fluid was approximately resolved as normal and tangential interactive models respe ctively, for which the governing equations were simplified on the basis of Reynolds approximation. These equations were then solved analytically together with the boundary conditions to obtain the pressure distributions for each individual model, and event u-ally solutions of the viscous squeeze force and the tangential viscous resistance were obtained, which provide a set of solutions for implementing into DEM code or other purposes.

关键词： wet granule Discrete Element Method Power-law fluid viscous force

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viscous forceS BETWEEN TWO SPHERES COLLIDING THROUGH INTERSTITIAL POWER-LAW FLUID

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China Particuology 2005年第1期3卷 52-57页

作者： YongXu HongyanLi WenbinHuang DepartmentofAppliedMechanics ChinaAgriculturalUniversityBeijing100083P.R.China DepartmentofTransportEngineering ShandongUniversityofTechnologyZibo255049P.R.China

Interaction between two spheres with an interstitial fluid is essential in Discrete Element modeling for simulating the behaviors of 'wet' particulate materials. In this paper the interaction between two spheres with an interstitial Power-law fluid was approximately resolved as normal and tangential interactive models respe ctively, for which the governing equations were simplified on the basis of Reynolds approximation. These equations were then solved analytically together with the boundary conditions to obtain the pressure distributions for each individual model, and event u-ally solutions of the viscous squeeze force and the tangential viscous resistance were obtained, which provide a set of solutions for implementing into DEM code or other purposes.

关键词： wet granule Discrete Element Method Power-law fluid viscous force

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An improved model predictive control method for wave energy converters

An improved model predictive control method for wave energy ...

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第40届中国控制会议

作者： Zhenchun Wang Feng Luan Nianguo Wang Hebei Key Laboratory of Industrial Computer Control Engineering Yanshan University Engineering Research Centre of the Ministry of Education for Intelligent Control System and Intelligent Equipment Yanshan University

The model accuracy and objective function complexity are key issues that remain in the realisation of model predictive control（MPC） of wave energy converters（WECs）.In this study,the viscous force is considered in a WEC model to improve model accuracy,and an improved model predictive control（IMPC） method is proposed that can reduce the quadratic programming（QP） performance requirements of the processor while maintaining a high energy conversion efficiency.The effectiveness of the IMPC method was verified through numerical simulations.

关键词： viscous force Wave energy converters Model predictive control

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