A Comparative Study of Saw-Toothed No-Moving-Part Valves(NMPV) in Micro-Channels

• Main Authors: Chung-Li Tsai, 蔡宗立
• Other Authors: Dartzi Pan
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/87521227652396124946

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 94 === This thesis compares various designs of Saw-toothed No-Moving-Part Valves (NMPV) for flows in micro-channels. NMPV is a valve design without any mechanical moving-part. The working principle of NMPV is the drag diodicity resulting from the asymmetric shape of the flow passages of the valve design. Under the same pressure difference across the valve, the flow drag is smaller in one direction (the preferred direction) than the drag in the opposite direction. This drag diodicity allows the flow passage function like a one-way check valve. Comparing with the traditional mechanical valves, a NMPV has the advantage of simplicity in both design and manufacturing, and also avoids the possible damage to fluid particles due to the on/off motion of the mechanical pump. This research uses Computational Fluid Dynamics as a tool to analyze designs of NMPV. In particular, the Reynolds number effect on various saw-toothed NMPV and diffuser valves are examined. It is found that in certain range of Reynolds number, the drag diodicity reversal will significantly affect the performance of a NMPV.