微混合流道設計、模擬與參數選擇

Abstract

使用兩層平面式流道上下貼合成一個簡單的雙層立體微混合流道(micro mixer)，不需要複雜的製程達到良好的混合效果，具有成本低與製造時間短的優勢。設計的流道有兩項變數，藉由有限元素分析軟體將不同變數組合下的效果模擬並求得混合效率值。混合效率值的計算上考慮流體流速後，有別於傳統混合效率值計算方式，可使混合效率(mixing index)值曲線平滑。平滑的混合效率值曲線較容易使用迴歸(regression)分析方式找出最適合的變數組合。本研究中，藉由回歸方式計算出的參數最佳組合對照研究開始時的參考參數，可以將混合效率提升11.1%。

Design, simulation and optimization of a serial lamination micromixer are adapted with the concept of vortex-producing obstacle. Although the fluid motion is three-dimensional, the channel merely requires a simple fabrication process of adhering two layers of polymer. Optimization is analyzed with two main geometric parameters of the design. Simulation through one computational fluid dynamics software is used to optimize these two variables, while taking into consideration the physical properties of the fluid, i.e., viscosity and the Reynolds number. By additional consideration of the velocity field, a new mixing index is created based on the traditional mixing index. The inherent advantage of this new mixing index is that it always produces smoother curves than that of the traditional one. Optimization results are achieved by using the regression analysis with the two geometric parameters