Development of Diffuser/Nozzle Based Valve-Less Micro-Pump

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  • TANAKA Seiichi
    Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology
  • TSUKAMOTO Hiroshi
    Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology
  • MIYAZAKI Koji
    Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology

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  • ディフューザ型バルブレスマイクロポンプの開発
  • ディフューザガタ バルブレス マイクロポンプ ノ カイハツ

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Abstract

In this study we have developed a valve-less micro-pump with one diffuser shaped element and a chamber with a diaphragm, the vibration of which produces an oscillating flow. The pressure-loss in a nozzle is lower than that in a diffuser, therefore one-way flow is realized in the nozzle direction. The frequency characteristics and the pump characteristics are measured. The measured maximum total pump head and volumetric flow rate are 0.8 kPa and 2.4 ml/min, respectively. The effect of working-fluid viscosity on pump characteristics is also discussed using water and glycerin-water solutions. As the result, the pump performances were found to be decreased with increasing fluid viscosity and the pump performances depended on the Reynolds number of oscillating flow.

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