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On the secondary flow through bifurcating pipes

Evegren, Philip LU ; Fuchs, Laszlo LU and Revstedt, Johan LU (2010) In Physics of Fluids 22(10).
Abstract
The secondary motion induced by flow through curves and bifurcations has been subject to investigation over long time due to its importance in physiological and technological applications. In contrast to the flow in a straight pipe, curvature leads to the formation of secondary flow which is often unsteady. Streamline curvature occurs also in bifurcating pipes leading to some corresponding secondary, unsteady flow. This paper presents a detailed description of the unsteady flow in the daughter branch after a 90 degrees bifurcation. A range of Reynolds and Womersley numbers are investigated. The results show the presence of Dean vortices and additional vortical patterns not reported in the literature. Both the streamwise (axial) and the... (More)
The secondary motion induced by flow through curves and bifurcations has been subject to investigation over long time due to its importance in physiological and technological applications. In contrast to the flow in a straight pipe, curvature leads to the formation of secondary flow which is often unsteady. Streamline curvature occurs also in bifurcating pipes leading to some corresponding secondary, unsteady flow. This paper presents a detailed description of the unsteady flow in the daughter branch after a 90 degrees bifurcation. A range of Reynolds and Womersley numbers are investigated. The results show the presence of Dean vortices and additional vortical patterns not reported in the literature. Both the streamwise (axial) and the secondary velocity components change character at larger Womersley numbers, leading to less complex secondary flow. Also, at larger Reynolds numbers, flow instabilities are observed. The secondary flow may lead to the formation of unsteady separation bubbles. This in turn yields peaks in the wall shear stress components. Such wall shear stress variations have often been related in the literature to the development process of atherosclerosis. (C) 2010 American Institute of Physics. (Less)
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Contribution to journal
publication status
published
subject
in
Physics of Fluids
volume
22
issue
10
publisher
American Institute of Physics
external identifiers
  • wos:000283748900015
  • scopus:79251550471
ISSN
1070-6631
DOI
10.1063/1.3484266
language
English
LU publication?
yes
id
a3e7b661-be26-4ca1-ae6e-ec903d3fe1a5 (old id 1753587)
date added to LUP
2010-12-29 11:11:03
date last changed
2018-06-24 03:15:34
@article{a3e7b661-be26-4ca1-ae6e-ec903d3fe1a5,
  abstract     = {The secondary motion induced by flow through curves and bifurcations has been subject to investigation over long time due to its importance in physiological and technological applications. In contrast to the flow in a straight pipe, curvature leads to the formation of secondary flow which is often unsteady. Streamline curvature occurs also in bifurcating pipes leading to some corresponding secondary, unsteady flow. This paper presents a detailed description of the unsteady flow in the daughter branch after a 90 degrees bifurcation. A range of Reynolds and Womersley numbers are investigated. The results show the presence of Dean vortices and additional vortical patterns not reported in the literature. Both the streamwise (axial) and the secondary velocity components change character at larger Womersley numbers, leading to less complex secondary flow. Also, at larger Reynolds numbers, flow instabilities are observed. The secondary flow may lead to the formation of unsteady separation bubbles. This in turn yields peaks in the wall shear stress components. Such wall shear stress variations have often been related in the literature to the development process of atherosclerosis. (C) 2010 American Institute of Physics.},
  articleno    = {103601},
  author       = {Evegren, Philip and Fuchs, Laszlo and Revstedt, Johan},
  issn         = {1070-6631},
  language     = {eng},
  number       = {10},
  publisher    = {American Institute of Physics},
  series       = {Physics of Fluids},
  title        = {On the secondary flow through bifurcating pipes},
  url          = {http://dx.doi.org/10.1063/1.3484266},
  volume       = {22},
  year         = {2010},
}