LaBarbera, “ Feeding currents and particle capture mechanisms in suspension feeding animals,” Am. Koehl, “ The mechanisms of filter feeding: Some theoretical considerations,” Am. Lu, “ Advances in microfluidic cell separation and manipulation,” Curr. Hansen, “ Microfluidic single cell analysis: From promise to practice,” Curr. These findings have potentially important implications on the design and use of biomimetic cilia in processes such as particle sorting in microfluidic devices. The optimal range of particle sizes is enhanced when cilia beat asynchronously. Meanwhile, large particles have difficulty entering the sub-ciliary region once advected downstream, also resulting in low capture rates. The low capture rate of smaller particles is due to the particles’ inability to cross the flow streamlines of neighboring cilia. These parameters affect the cilia-generated flow field, which in turn affects particle trajectories. The optimal size depends nonlinearly on cilia spacing and cilia coordination, synchronous vs. Consistent with experimental observations, we find optimal particle sizes that maximize capture rate. Here, we develop a 3D computational model of ciliary bands interacting with flow suspended particles and calculate particle trajectories for a range of particle sizes. One of the capture strategies is to use the same cilia to generate feeding currents and to intercept particles when the particles are on the downstream side of the cilia. For example, many aquatic microorganisms use filter feeding to capture food particles from the surrounding fluid, using motile cilia. Selective particle filtration is fundamental in many engineering and biological systems.
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