CFD simulation of micro-particle trapping under water tweezers  

作　　者：Xin-Hua Yi Xiao-Min Cheng Feng-Lian Niu Hong-Chao Fan 

机构地区：[1]School of Mechanical Engineering,Ningbo University of Technology [2]School of Mechanical and Electrical Engineering,Ningbo Dahongying University

出　　处：《Advances in Manufacturing》2014年第3期259-264,共6页先进制造进展（英文版）

基　　金：jointly sponsored by the National Natural Science Foundation of China(Grant No.51275251);the Natural Science Foundation of Ningbo Municipality(Grant No.2013A610048)

摘　　要：In early research, capture and manipulation of particles were mainly achieved by means of light, electricity and plasma in micro-fabficaton and micro-assembly. A new method is proposed using micro-water jet to form water tweezers to capture solid particles and implement position control of micro-particles. This paper analyzes the basic prin- ciple of water tweezers, and the discrete element method and smoothed particle hydrodynamics method are employed to establish a solid-liquid coupling model used in analyzing the trapping mechanism. A flow field model is set up to simulate dynamic characteristic of water tweezers based on computa- tional fluid dynamics （CFD）. Selection of boundary conditions, initial guess, solver control and convergence strategies of the model are discussed. Velocity and pressure of streamline are predicted and discussed under certain input conditions. Simu- lation results demonstrate that it is an efficiently theoretical method to eventually trap solid particles by water tweezers.In early research, capture and manipulation of particles were mainly achieved by means of light, electricity and plasma in micro-fabficaton and micro-assembly. A new method is proposed using micro-water jet to form water tweezers to capture solid particles and implement position control of micro-particles. This paper analyzes the basic prin- ciple of water tweezers, and the discrete element method and smoothed particle hydrodynamics method are employed to establish a solid-liquid coupling model used in analyzing the trapping mechanism. A flow field model is set up to simulate dynamic characteristic of water tweezers based on computa- tional fluid dynamics （CFD）. Selection of boundary conditions, initial guess, solver control and convergence strategies of the model are discussed. Velocity and pressure of streamline are predicted and discussed under certain input conditions. Simu- lation results demonstrate that it is an efficiently theoretical method to eventually trap solid particles by water tweezers.

关 键 词：Water tweezers Micro-particle trapping Computational fluid dynamics （CFD） Boundary condition 

分 类 号：O35[理学—流体力学]