面向电磁MEMS的微流通道流体运动特性的数值模拟研究

 陈华生1,吴宏杰1,刘孝光2

(1.安徽池州伟舜机电有限公司,安徽 池州 247000;2.池州学院 机电工程学院,安徽 池州 247000)
摘要:基于正交磁场和速度场的弱耦合作用,建立微流孔通道内导电流体的二维直流磁流体动力学模型,采用数值模拟方法研究电磁MEMS微流道内的导电流体运动特性。数值模拟基于Galerkin有限元方法,采用SIMPLE压力修正算法,求解瞬态不可压层流运动。模拟结果表明微流道内上游抛物线型速度分布的流体加速明显,并在控制段形成M型速度分布,当Hartmann数增大到一定数值后,并不能显著增加系统压力降,反而可能在电极区形成回流涡。
关键词:电磁MEMS;微流体通道;直流磁流体动力学;数值模拟;速度场
中图分类号:O361;TH701 文献标志码:A doi:10.3969/j.issn.1006-0316.2016.09.008
文章编号:1006-0316 (2016) 09-0034-06
Numerical Simulation for Fluid Motion in Microfluidic Channel of Electromagnetic MEMS
CHEN Huasheng1,WU Hongjie1,LIU Xiaoguang2
( 1.Anhui Machinery & Electrical Co., Ltd., Chizhou 247000, China; 2.Department of Mechanical and Electrical Engineering, Chizhou College, Chizhou 247000, China )
Abstract:A 2-dimensional DC magneticfluiddynamics model is developed for Electromagnetic MEMS Microfluidics channel based on weak coupling effect of the perpendicular magnetic field and fluid flow velocity field to investigate the motion characteristics of microfluidics. The characteristics of electric flow are investigated using numerical simulation for electromagnetic MEMS microfluidics controlling. The transient, incompressible, laminar micro-flow is numerically solved using the Galerkin finite element method and pressure correction algorithm-the SIMPLE. The simulation results show that the parabolic velocity distribution of the upstream fluid is accelerated, and evolve into M-type velocity distribution at. The pressure did not significantly change when the Hartmann number increases to a certain value, and the reflux vortex may be formed at the electrode area.
Key words:electromagnetic MEMS;microfluidics channel;DC magnetic fluid dynamics model;numerical simulation;velocity profile of flow
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收稿日期:2016-03-25
基金项目:安徽省高校自然科学研究重点项目(KJ2016A513)
作者简介:陈华生(1967-),男,安徽池州人,本科,工程师,主要从事过程装备及控制、数控加工设备的研制工作。
 

 

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