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Title:
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Secondary Flow and Upstream Dynamics in Double Bifurcation Model |
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Author:
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Leong, Fong Yew; Smith, Kenneth A.; Wang, Chi-Hwa |
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Issue Date:
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2007-01 |
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Abstract:
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Flow behavior in bifurcation models is of great importance to health risk assessments and pulmonary drug delivery. This is particularly true of secondary flow behavior in multi-bifurcation models. Previously, both numerical and experimental methods have shown that four-vortex secondary flow structures can develop in the cross-sections of grand-daughter branches. This work shows that the development of secondary flow in the grand-daughter tubes is due to local stretching of vortex lines in the upstream DT. Scaling arguments have been used to derive two critical parameters governing this particular vorticity transport problem. A simple model for vorticity generation and transport is proposed, taking into account the geometric limitations imposed by the rigid walls of the tubes. |
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URI:
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http://hdl.handle.net/1721.1/35876
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Series/Report no.:
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Chemical and Pharmaceutical Engineering (CPE) |
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Keywords:
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Bifurcation, Lung, Secondary Flow, Vortex Stretching |
