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首页> 外文会议>1999 International Conference on Modeling and Simulation of Microsystems Apr 19-21, 1999, San Juan, Puerto Rico, USA >Numerical Simulations of Flat-walled Diffuser Elements for Valveless Micropumps
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Numerical Simulations of Flat-walled Diffuser Elements for Valveless Micropumps

机译：无阀微泵平壁扩散器元件的数值模拟

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摘要

The flow directing capability of micromachined flat-walled diffuser elements for valve-less micropumps have been investigated. The diffuser element is a small angle flow channel with a rounded inlet and a preferably sharp outlet. The diverging-wall direction is the positive flow direction. The commercial Computational Fluid Dynamics program ANSYS/Flotran (version 5.3) was used to simulate the flow pressure characteristic of several diffuser elements. The simulations are compared with experimental results. It is found that the simulated flow-pressure characteristic agrees well with the measured in the converging-wall direction and for Reynolds number below 300-400 in the diverging-wall direction. For higher Reynolds numbers the pressure loss in the diverging-wall direction is underestimated. The simulations are not sufficient for design optimization, but is very useful to increase the qualitative understanding of the flow in the diffuser element.
机译：研究了无阀微型泵的微机械扁平壁扩压器元件的导流能力。扩散器元件是具有圆形入口和优选尖锐出口的小角度流动通道。分流壁方向是正流动方向。商业计算流体动力学程序ANSYS / Flotran（5.3版）用于模拟多个扩散器元件的流动压力特性。仿真与实验结果进行了比较。结果表明，模拟的流动压力特性与在会聚壁方向上测得的值和在雷诺数低于300-400时在扩散壁方向上的测量值非常吻合。对于更高的雷诺数，低估了发散壁方向的压力损失。这些模拟不足以优化设计，但对于增加对扩散器元件中流动的定性了解非常有用。

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