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Position and trajectrories of helical microswimmers inside circular channels

Çaldağ, Hakan Osman and Yeşilyurt, Serhat (2015) Position and trajectrories of helical microswimmers inside circular channels. In: 68th Annual Meeting of the APS Division of Fluid Dynamics, Boston, Massachusetts

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Abstract

This work reports the position and orientation of helical mm-sized microswimmers in circular channels obtained by image processing of recorded images. Microswimmers are biologically inspired structures with huge potential for medical practices such as delivery of potent drugs into tissues. In order to understand the hydrodynamic effects of confinement on the velocity and stability of trajectories of swimmers, we developed helical microswimmers with a magnetic head and a rigid helical tail, similar to those of \textit{E. coli} bacteria. The experiments are recorded using a digital camera, which is placed above the experimental setup that consists of three Helmholtz pairs, generating a rotating magnetic field. A channel containing the microswimmer is placed along the axis of the innermost coil. Image processing tools based on contrast-enhancement are used to obtain the centroid of the head of the swimmer and orientation of the whole swimmer in the channel. Swimmers that move in the direction of the head, i.e. pushed kinematically by the tail, has helical trajectories, which are more unstable in the presence of Poiesuille flow inside the channel; and the swimmers that are pulled by the tail, have trajectories that stabilize at the centerline of the channel.

Item Type:Papers in Conference Proceedings
Additional Information:Abstract: R39.00011
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ163.12 Mechatronics
ID Code:27611
Deposited By:Serhat Yeşilyurt
Deposited On:08 Dec 2015 15:50
Last Modified:08 Dec 2015 15:50

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