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Fundamental Study on the Interior Flow of Mini Viscous Pump

Author: LiJinWei
Tutor: LiuShuHong
School: Tsinghua University
Course: Power Engineering and Engineering Thermophysics
Keywords: Micromachines MEMS Viscous pump PIV technology Visualization of measurement
CLC: TH38
Type: Master's thesis
Year: 2005
Downloads: 114
Quote: 1
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Abstract

The mid-1970s, the United States in the development of micro-sensors, the first use of the term micromachines, micro-mechanical characteristic scales in millimeters, mechanical microns. The late 1980s, the micro-mechanical technology and microelectronic control technology combination, the birth of a micro-electro-mechanical systems (MEMS), micro-flow system is an important branch of MEMS, and in recent years has become a popular research area. Implementation of the device as an important micro-flow system, the micro pump is an important symbol of their level of development. Over the last decade, the manufacturing technology of the micro pump With the fast development, although currently there are a variety of micro-pumps have been put into operation, however, most of the studies focused only in the manufacturing process of the micro pump and drive way, researchers their understanding of the internal flow law is still in a relatively backward stage. Only in-depth study of micro pump internal flow law, in order to better achieve the performance prediction and optimization of the design of the miniature pump. This article production processing two different sizes of micro viscous pump, and design of the entire test system. PIV (Particle Image Velocimetry) a visual measurement of the internal flow of a viscous pump further analysis on the collected data viscous interior of the pump flow line distribution, the velocity distribution of the outlet end face and the outlet end the variation of the average speed and volume flow with changes in the test parameters, a more in-depth study of the internal flow characteristics of the viscous pump Discussion. To test the viscous pump internal flow field for numerical calculation of the object, its division unstructured grid, finite volume method is discrete as well SIMPLEC pressure for speed control equation coupling solution, solid wall using no-slip no penetration boundary conditions, no-slip boundary conditions for the solid-liquid interface, the free surface boundary conditions of zero shear, the numerical simulation of the entire internal flow field, get rich internal flow characteristics. Finally, a comparative analysis of the results of the experiment and calculation, mutual verify the accuracy and validity of the two results. Calculated for the future in the case of difficult to test a theoretical basis to optimize the design, and can be used in the numerical calculation based on the structure of the viscous pump, in order to achieve the purpose of improvement viscous properties of the pump.

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