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- W1986586191 abstract "Oscillatory flow in straight and deformed geometries is seen in various biomedical applications. The nature of flow plays a significant role in the pathogenesis of an abdominal aortic aneurysm. The present study examines the onset of chaotic flow inside a bulged tube under oscillating flow conditions. An experimental facility is set up for generating the oscillatory flow field inside the model. A fusiform shaped model is hollowed out in a rectangular silicone model. A mixture of water and glycerin is used as the working liquid. Two-camera imaging system placed at right angles is used for three-component velocity measurement of a spherical particle inside the model. Images recorded as a time sequence are analyzed by a particle tracking algorithm. The particle trajectories in space and instantaneous velocities within the bulge have been obtained from experiments as well as numerical simulation. The frequency of oscillation considered is 1.2 Hz and the peak Reynolds numbers are in the range of 650–1200 (experiments) and 1000–3500 (simulation). The dimensionless frequency defined by the Womersely number is in the range of 10–12. Velocity signals obtained from the experiment have been analyzed to study chaotic behavior of fluid flow. Chaos is quantified in terms of the largest Lyapunov exponent, positive values being a signature of chaos. The Lyapunov exponent increases with Reynolds number and is significantly higher in the bulged geometry compared to that of the straight tube. The signature of chaotic flow is also seen in power spectra and Poincaré plots." @default.
- W1986586191 created "2016-06-24" @default.
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- W1986586191 date "2013-06-07" @default.
- W1986586191 modified "2023-10-11" @default.
- W1986586191 title "Chaotic flow in an aortic aneurysm" @default.
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- W1986586191 doi "https://doi.org/10.1063/1.4809559" @default.
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