Secondary Flow and Upstream Dynamics in Double Bifurcation Model
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 structur...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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2007
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| Online Access: | http://hdl.handle.net/1721.1/35876 |
| _version_ | 1826193339406352384 |
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| author | Leong, Fong Yew Smith, Kenneth A. Wang, Chi-Hwa |
| author_facet | Leong, Fong Yew Smith, Kenneth A. Wang, Chi-Hwa |
| author_sort | Leong, Fong Yew |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T09:37:29Z |
| format | Article |
| id | mit-1721.1/35876 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:37:29Z |
| publishDate | 2007 |
| record_format | dspace |
| spelling | mit-1721.1/358762019-04-13T00:09:09Z Secondary Flow and Upstream Dynamics in Double Bifurcation Model Leong, Fong Yew Smith, Kenneth A. Wang, Chi-Hwa Bifurcation Lung Secondary Flow Vortex Stretching 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. Singapore-MIT Alliance (SMA) 2007-02-06T12:00:00Z 2007-02-06T12:00:00Z 2007-01 Article http://hdl.handle.net/1721.1/35876 en Chemical and Pharmaceutical Engineering (CPE) application/pdf |
| spellingShingle | Bifurcation Lung Secondary Flow Vortex Stretching Leong, Fong Yew Smith, Kenneth A. Wang, Chi-Hwa Secondary Flow and Upstream Dynamics in Double Bifurcation Model |
| title | Secondary Flow and Upstream Dynamics in Double Bifurcation Model |
| title_full | Secondary Flow and Upstream Dynamics in Double Bifurcation Model |
| title_fullStr | Secondary Flow and Upstream Dynamics in Double Bifurcation Model |
| title_full_unstemmed | Secondary Flow and Upstream Dynamics in Double Bifurcation Model |
| title_short | Secondary Flow and Upstream Dynamics in Double Bifurcation Model |
| title_sort | secondary flow and upstream dynamics in double bifurcation model |
| topic | Bifurcation Lung Secondary Flow Vortex Stretching |
| url | http://hdl.handle.net/1721.1/35876 |
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