Numerical Simulation and Hydrodynamic Design Optimization of a Tesla-Type Valve for Micropumps
نویسنده
چکیده
A numerical optimization methodology is applied to improve the design of a microchannel structure used in a valveless micropump. The flow simulation algorithm employs the control volume method for Cartesian grids, while advanced numerical techniques are implemented for automatic generation of unstructured, adaptively refined grids and for the representation of irregular boundaries. Several geometric properties of the microchannel are considered as free design variables, and an optimization software based on evolutionary algorithms is used to find the best performance design. The latter is characterized by the ratio of the pressure drop in reverse flow to that in forward flow through the channel, and represents the flow rectification efficiency of the valve, when it is used as a check valve in a reciprocating pump. The optimal design is obtained quite fast and its pressure drop ratio is 50% higher compared to a standard design. Effects of Reynolds number on the valve performance are also examined and presented. Finally, the dynamic behavior of the valve under periodic flow conditions encountered in a reciprocating micropump is simulated and discussed.
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