| The flow characteristics of fluid in micro-pump have a significant impact on the performances of micro-pump. This paper is specific to the errors and vacancies of the micro-pump researches under steady and unsteady conditions, proposed appropriate theoretical, and discussed the causes of the flow phenomena in details. The main content include the following sections:1. According to the principles of energy dissipation and pressure reduce, study the total pressure loss and pressure loss characteristics of diffuser/nozzle valveless micropump in the case of low reynolds laminar flow, and carry on the numerical simulation using the finite element software. The simulation results show that, in the case of low Reynolds laminar, total pressure loss of various parts of diffuser/nozzle components should not be ignored, total loss coefficient decrease with the increase of divergence angle and pressure difference. When the pressure difference is low, a larger divergence angle micropump has better rectification efficiency, when the pressure difference is high, a smaller divergence angle micropump have better rectification efficiency.2. Through numerical simulation, study the influences of the unsteady hysteresis of the fluid in diffuser/nozzle components to the micropump flow, and the related parameters that effect the rectification efficiency of micro-pump in unsteady state. It is found that the more lag of the diversification of velocity profiles relative to the averaged velocity in diffuser/nozzle components, the less lag of the diversification of flow relative to the diversification of pressure, the flow of the micropump increase more greatly. The optimal unsteady rectification efficiency of the micropump increases with the increase of the aptitude of pressure difference, and the greater of the aptitude of pressure difference, the corresponding drive frequency of the optimal unsteady rectification efficiency of micro-pump increases. |
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