17 February 2010 Analysis on the effect of geometrical design parameters on maximum shear stresses in an electromagnetic micropump
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In this work, the concept of recently introduced electromagnetic pump has been presented. This pump has been proposed for pumping biomedical fluids carrying particles sensitive to shear stresses. Its working concept depends on controlling the rotation of two pistons placed in a circular channel in opposing polarity under the influence of a moving electromagnetic field. Analytical and numerical investigations on the effect of pump geometrical parameters on shear stresses at different boundary conditions are performed. The geometrical parameters include: channel aspect ratio (channel width to height) and channel radius ratio (inner to outer radius). Non-dimensional simple analytical shear stress expressions that are valid for a wide range of geometrical design parameters and variety of fluids are derived. CFD simulations have been used to verify the analytical expressions within the range of studied parameters. Obtained results showed that the analytical models predict the wall maximum shear stresses with an error less than 5% for w / h≤1.0 at high radius ratios and with an error less than10% for Ri / Ro ≥0.3. These results help the designer in fabricating the micropump to be suitable for biomedical applications, where saving the particles carried in fluids from damage is of high importance.
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A. T. Al-Halhouli, A. T. Al-Halhouli, } "Analysis on the effect of geometrical design parameters on maximum shear stresses in an electromagnetic micropump", Proc. SPIE 7593, Microfluidics, BioMEMS, and Medical Microsystems VIII, 759315 (17 February 2010); doi: 10.1117/12.842652; https://doi.org/10.1117/12.842652

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