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长春光学精密机械与物... [1]
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会议论文 [1]
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2008 [1]
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专题:长春光学精密机械与物理研究所
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Simulations and experimental studies of diffuser/nozzle pumps (EI CONFERENCE)
会议论文
4th International Symposium on Precision Mechanical Measurements, August 25, 2008 - August 29, 2009, Hefei/Jiuhua Mountain, Anhui, China
Bai L.
;
Feng Z.
;
Wu Y.
;
Li W.
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提交时间:2013/03/25
An investigation of diffuser/nozzle micropumps is presented. Numerical simulations are done using CFD program ANSYS/Flotran. The simulations show when the opening angel is small
the flow in the diffuser/nozzle is steady
the mass flow is increasing with the adding opening angle. But when the opening angel continues increasing
the pressure grads will be bigger than zero. It means that the static pressure is gradually going up along the diverging direction. The fluid near the wall stops flowing because the velocity decreases rapidly and the dynamic pressure is not big enough to overcome the increasing of the static pressure. Finally the fluid flows reversely from the backward position of higher pressure area
this makes the separation flow of fluid
the diffuser is full of reverse fluid. And this results in the dropping of mass flow at last. The simulations also show that the performance of diffuser with a round inlet is better than that with a sharp inlet. The mass flow of micropumps with different opening angles
different inlets are measured. The experimental results agree well with the simulations. 2008 SPIE.
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