Investigation of an Objective Function to Optimize a Micro-Peristaltic Pump with Slanted Membranes

• Main Authors: Yung-Hsu Tang, 湯詠旭
• Other Authors: Jyh-Jong Sheen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/71718314841733273808

碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 99 === Most of micro-peristaltic pumps use three plane membranes as actuating membranes. Through sequential control of deflections of three membranes, a periodic peristaltic pumping motion is generated. We design a bi-directional micro pneumatic peristaltic pump driven by slanted membranes. Our micro-peristaltic pump has two opposite slanted membranes tandem along the fluid channel. It will produce continuous and asymmetric deflections under increasing pneumatic pressure. Experimental results show that our peristaltic pump achieves much higher maximum flow rate than that of a micro peristaltic pump with three flat membranes of similar size. Since the pumping performance of the peristaltic pump with slanted membranes depends highly on the thickness distribution of the membranes, the objective of this study is to find the optimal thickness distribution of membranes. We use the multi-physics feature of the simulation software CFD-RC to analyze the membrane deformation and fluid volume expelled downstream. The volume discharged downstream is used as the objective function to optimize the thickness distribution of a micro-peristaltic pump. The effect of the actuating pneumatic pressure is also investigated. Under the condition of 7000 N/m2 actuating pressure, the optimal volume discharged downstream for the rectangle membrane is increased by about 17.3% compared to a slanted membranes with linear thickness distribution.