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Numerical Analysis of Flow Geometry in I-Shaped Viscous Micropumps Using LB-IBM
Author(s): Amir Alimoradi, seyed ali mirbozorgi
Keywords: Lattice Boltzmann Method, Immersed Boundary Method, Viscous Micropump
In viscous micropumps one of the main reason for flow rate reduction is vortices which are located at the top of rotating rotor. In this paper, we have tried to add proper additional walls in the micropump channel, in order to eliminate or decrease the size of these vortices. Among the all investigated new models, only one, the I-Shaped micropump with an extra step above the rotor, could reduce the size of the vortices and also increase the outlet flow rate. In this paper, the numerical simulations were conducted by using the Lattice Boltzmann Method and by exploiting the Immersed Boundary method and the Blocking technique in order to overcome the LBM drawbacks. The results show that at the channel height H*=3.7, this new model can produce a flow rate of 150% more than the normal I-Shaped micropumps. In addition, one can tune the maximum produced pressure by adjusting the height of this step.