Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F20: Biological Fluid Dynamics: General II
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B308
Chair: Luciano Castillo, Purdue University
Abstract ID: BAPS.2018.DFD.F20.8
Abstract: F20.00008 : Optical Tweezers-based velocimetry: A method to measure microscale unsteady flows
9:31 AM–9:44 AM
Presenter:
Parviz Ghoddoosi Dehnavi
(Delft Univ of Tech)
Authors:
Parviz Ghoddoosi Dehnavi
(Delft Univ of Tech)
Daniel Tam
(Delft Univ of Tech)
Da Wei
(Delft Univ of Tech)
Motility and transport of fluids by micro-organisms relies on the generation of oscillatory flows generated by flagella or cilia at high frequencies. To understand the underlying physics governing the motility of ciliated microorganisms and ciliary synchronization, it is essential to accurately measure and characterize the unsteady flow fields they generate. Time resolved measurements of unsteady flows of small amplitudes and high frequencies are challenging with PIV or PTV, and measurements have often been limited to average flows. The limitation of particle based methods lies in the fact that, on these scales, the particle motion is indistinguishable from Brownian motion. Here, we present a velocimetry method based on optical tweezers that allow us to measure oscillatory flows with high accuracy and resolution. In this method, we measure the nanometer-scale displacements of a bead trapped inside the optical tweezers, and analyze the position measurements to extract the actual flow velocity. In addition, as an example, we measure the unsteady oscillatory flow around the bi-flagellated green alga Chlamydomonas reinhardtii, and compare with numerical predictions.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F20.8
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