ディフューザ型バルブレスマイクロポンプの開発(流体工学,流体機械)  [in Japanese] Development of Diffuser/Nozzle Based Valve-Less Micro-Pump(Fluids Engineering)  [in Japanese]

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.

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.