Using three-dimensional computer simulations, we probe biomimetic free swimming of an internally actuated flexible plate in the regime near the first natural frequency. The plate is driven by an oscillating internal m...Using three-dimensional computer simulations, we probe biomimetic free swimming of an internally actuated flexible plate in the regime near the first natural frequency. The plate is driven by an oscillating internal moment approximating the actuation mechanism of a piezoelectric macro fiber composite (MFC) bimorph. We show in our simulations that the addition of a passive attachment increases both swimming velocity and efficiency. Specifically, if the active and passive sections are of similar size, the overall performance is the best. We determine that this optimum is a result of two competing factors. If the passive section is too large, then the actuated portion is unable to generate substantial deflection to create sufficient thrust. On the other hand, a large actuated section leads to a bending pattern that is inefficient at generating thrust especially at higher frequencies.展开更多
One of the vital functions of naturally occurring cilia is fluid transport.Biological cilia use spatially asymmetric strokes to generate a net fluid flow that can be utilized for feeding,swimming,and other functions.B...One of the vital functions of naturally occurring cilia is fluid transport.Biological cilia use spatially asymmetric strokes to generate a net fluid flow that can be utilized for feeding,swimming,and other functions.Biomimetic synthetic cilia with similar asymmetric beating can be useful for fluid manipulations in lab-on-chip devices.In this paper,we demonstrate the microfluidic pumping by magnetically actuated synthetic cilia arranged in multi-row arrays.We use a microchannel loop to visualize flow created by the ciliary array and to examine pumping for a range of cilia and microchannel parameters.We show that magnetic cilia can achieve flow rates of up to 11μl/min with the pressure drop of~1 Pa.Such magnetic ciliary array can be useful in microfluidic applications requiring rapid and controlled fluid transport.展开更多
文摘Using three-dimensional computer simulations, we probe biomimetic free swimming of an internally actuated flexible plate in the regime near the first natural frequency. The plate is driven by an oscillating internal moment approximating the actuation mechanism of a piezoelectric macro fiber composite (MFC) bimorph. We show in our simulations that the addition of a passive attachment increases both swimming velocity and efficiency. Specifically, if the active and passive sections are of similar size, the overall performance is the best. We determine that this optimum is a result of two competing factors. If the passive section is too large, then the actuated portion is unable to generate substantial deflection to create sufficient thrust. On the other hand, a large actuated section leads to a bending pattern that is inefficient at generating thrust especially at higher frequencies.
基金We thank the USDA NIFA(grant#11317911)the National Science Foundation(CBET-1510884)for financial support
文摘One of the vital functions of naturally occurring cilia is fluid transport.Biological cilia use spatially asymmetric strokes to generate a net fluid flow that can be utilized for feeding,swimming,and other functions.Biomimetic synthetic cilia with similar asymmetric beating can be useful for fluid manipulations in lab-on-chip devices.In this paper,we demonstrate the microfluidic pumping by magnetically actuated synthetic cilia arranged in multi-row arrays.We use a microchannel loop to visualize flow created by the ciliary array and to examine pumping for a range of cilia and microchannel parameters.We show that magnetic cilia can achieve flow rates of up to 11μl/min with the pressure drop of~1 Pa.Such magnetic ciliary array can be useful in microfluidic applications requiring rapid and controlled fluid transport.
