The Design And Numerical Simulation Of The Microfluidic System

The Microfluidic system is an important branch of micro-electromechanical systems(MEMS),it is a high integrated micro-system consisting of micro-pipe,micro-pumps,micro-valve,micro-sensor and other components.Because of its advantages such as light portability,low power consumption,high control precision and fast response,the system has wide market application prospect in the fields of micro-chemical analysis,trace particle detection,and micro-injection of drugs.The Microfluidic system is one of the modern analytical science technology.Its broad application prospect makes the microfluidic system become the research hotspot both at home and abroad.The Microfluidic system related quantitative,qualitative analysis in the micro-scale,some of the physical phenomena that appear in the analysis are quite different from the macroscopic world,and these differences bring many difficulties to microfluidic system research.With the continuous development of numerical analysis technology,the application of numerical analysis method to simulate the more complex physical phenomena can make accurate prediction for the researchers,effectively reduce the experimental cost and shorten the research cycle.Therefore,this paper makes a numerical simulation of the microfluidic system,and makes an accurate prediction of the silver sol aggregation and electrostatic micro-pump driving characteristics in the microfluidic system.Firstly,simulating the aggregation of silver sol in the micro-channel through COMSOL Multiphysics,the influence of fluid velocity and silver sol concentration on the maximum concentration of dimer was studied by parameterizing the flow rate and the concentration of silver sol.The simulation results show that the relationship between the dimmers of maximum concentration and silver sol,the position of dimmers and fluid velocity.Secondly,the driving frequency of the electrostatic micro-pump in the wet mode was determined by frequency domain characteristics analysis.then,the three-phase coupling simulation is carried out about the electrostatic micro-pump membrane,the moving fluid and the alternating voltage to study the relationship between the driving voltage and the flow,flow velocity.The simulation results not only show that the electrostatic micro-pump reaches the maximum working efficiency when the frequency is 500 Hz,but show the relationship between the driving voltage and the pumped static flow rate,the driving voltage and the working fluid velocity at maximum working efficiency.Finally,we design the production processes of micro-channel,electrostatic micro-pump,and give the specific process parameters,which make a good preparation for the follow-up experiment.