本研究是以計算流體力學套裝軟體Fluent,來對無閥式微型幫浦進行研究。模擬無閥式微型幫浦需設定移動邊界條件,因此網格需使用動態網格系統,本文會對Fluent的動態網格進行驗證,並找出簡化移動邊界條件的方法以避免使用複雜的動態網格系統;本文藉由假設幫浦進出口兩端流體速度會隨時間成三角函數sine的變化,進而推導出一個計算一個工作周期幫浦流量的積分式,藉由取得暫態幫浦中的漸擴管效率,該積分式可簡化為只有漸擴管效率的關係式,文中會對該關係式在各種雷諾數之下的準確性做驗證;本文亦會對漸擴管效率做研究,比較在不同雷諾數與張角之下,暫態與穩態的漸擴管效率會有何種差異;有了計算幫浦流量的多項式與暫態、穩態之間關於漸擴管效率的研究,對於日後幫浦設計上會有很大的幫助
The objective of study is to investigate valve-less micropump by CFD software Fluent.Simulating valve-less micropump has to use moving boundary condition, so the mesh has to use the dynamic mesh system.This text will prove the feasibility of dynamic mesh,and find out simplified boundary condition for avoiding the complicated dynamic mesh system.This article supposes that the importing and exporting velocity will be changed of trigonometric function sine with time, and then derives out integral formula of the flow rate per period.The integral formula can be simplified to diffuser efficiency formula by getting efficiency of diffuser .This article will prove the accuracy of diffuser efficiency formula in different Reynolds number, and compare the efficiency of diffuser for different Reynolds nurmber and diffuser angles in trainsient and steady process.This investigation will be very helpful for the design of micropump system.