Numerical Flow Analysis in a Rotating Square Duct and a Rotating Curved-Duct
A numerical study is conducted on the fully-developed laminar flow of an incompressible viscous fluid in a square duct rotating about a perpendicular axis to the axial direction of the duct. At the straight duct, the rotation produces vortices due to the Coriolis force. Generally two vortex cells ar...
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Wiley
2000-01-01
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| Series: | International Journal of Rotating Machinery |
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| Online Access: | http://dx.doi.org/10.1155/S1023621X00000014 |
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| author | Je Hyun Baekt Chang Hwan Ko |
| author_facet | Je Hyun Baekt Chang Hwan Ko |
| author_sort | Je Hyun Baekt |
| collection | DOAJ |
| description | A numerical study is conducted on the fully-developed laminar flow of an incompressible viscous fluid in a square duct rotating about a perpendicular axis to the axial direction of the duct. At the straight duct, the rotation produces vortices due to the Coriolis force. Generally two vortex cells are formed and the axial velocity distribution is distorted by the effect of this Coriolis force. When a convective force is weak, two counter-rotating vortices are shown with a quasi-parabolic axial velocity profile for weak rotation rates. As the rotation rate increases, the axial velocity on the vertical centreline of the duct begins to flatten and the location of vorticity center is moved near to wall by the effect of the Coriolis force. When the convective inertia force is strong, a double-vortex secondary flow appears in the transverse planes of the duct for weak rotation rates but as the speed of rotation increases the secondary flow is shown to split into an asymmetric configuration of four counter-rotating vortices. If the rotation rates are increased further, the secondary flow restabilizes to a slightly asymmetric double-vortex configuration. Also, a numerical study is conducted on the laminar flow of an incompressible viscous fluid in a 90°-bend square duct that rotates about axis parallel to the axial direction of the inlet. At a 90°-bend square duct, the feature of flow by the effect of a Coriolis force and a centrifugal force, namely a secondary flow by the centrifugal force in the curved region and the Coriolis force in the downstream region, is shown since the centrifugal force in curved region and the Coriolis force in downstream region are dominant respectively. |
| format | Article |
| id | doaj-art-46ecf7c9ef9549e79772cc8dfd3ff7fd |
| institution | DOAJ |
| issn | 1023-621X |
| language | English |
| publishDate | 2000-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-46ecf7c9ef9549e79772cc8dfd3ff7fd2025-08-20T02:39:19ZengWileyInternational Journal of Rotating Machinery1023-621X2000-01-01611910.1155/S1023621X00000014Numerical Flow Analysis in a Rotating Square Duct and a Rotating Curved-DuctJe Hyun Baekt0Chang Hwan Ko1School of Environmental Engineering, POSTECH, San 31, HyoJa Dong, Namgu, Pohang 790-784, KoreaSchool of Environmental Engineering, POSTECH, San 31, HyoJa Dong, Namgu, Pohang 790-784, KoreaA numerical study is conducted on the fully-developed laminar flow of an incompressible viscous fluid in a square duct rotating about a perpendicular axis to the axial direction of the duct. At the straight duct, the rotation produces vortices due to the Coriolis force. Generally two vortex cells are formed and the axial velocity distribution is distorted by the effect of this Coriolis force. When a convective force is weak, two counter-rotating vortices are shown with a quasi-parabolic axial velocity profile for weak rotation rates. As the rotation rate increases, the axial velocity on the vertical centreline of the duct begins to flatten and the location of vorticity center is moved near to wall by the effect of the Coriolis force. When the convective inertia force is strong, a double-vortex secondary flow appears in the transverse planes of the duct for weak rotation rates but as the speed of rotation increases the secondary flow is shown to split into an asymmetric configuration of four counter-rotating vortices. If the rotation rates are increased further, the secondary flow restabilizes to a slightly asymmetric double-vortex configuration. Also, a numerical study is conducted on the laminar flow of an incompressible viscous fluid in a 90°-bend square duct that rotates about axis parallel to the axial direction of the inlet. At a 90°-bend square duct, the feature of flow by the effect of a Coriolis force and a centrifugal force, namely a secondary flow by the centrifugal force in the curved region and the Coriolis force in the downstream region, is shown since the centrifugal force in curved region and the Coriolis force in downstream region are dominant respectively.http://dx.doi.org/10.1155/S1023621X00000014Rotating channelNumerical analysisCoriolis forceCentrifugal forceSecondary flowLaminar. |
| spellingShingle | Je Hyun Baekt Chang Hwan Ko Numerical Flow Analysis in a Rotating Square Duct and a Rotating Curved-Duct International Journal of Rotating Machinery Rotating channel Numerical analysis Coriolis force Centrifugal force Secondary flow Laminar. |
| title | Numerical Flow Analysis in a Rotating Square Duct and a Rotating
Curved-Duct |
| title_full | Numerical Flow Analysis in a Rotating Square Duct and a Rotating
Curved-Duct |
| title_fullStr | Numerical Flow Analysis in a Rotating Square Duct and a Rotating
Curved-Duct |
| title_full_unstemmed | Numerical Flow Analysis in a Rotating Square Duct and a Rotating
Curved-Duct |
| title_short | Numerical Flow Analysis in a Rotating Square Duct and a Rotating
Curved-Duct |
| title_sort | numerical flow analysis in a rotating square duct and a rotating curved duct |
| topic | Rotating channel Numerical analysis Coriolis force Centrifugal force Secondary flow Laminar. |
| url | http://dx.doi.org/10.1155/S1023621X00000014 |
| work_keys_str_mv | AT jehyunbaekt numericalflowanalysisinarotatingsquareductandarotatingcurvedduct AT changhwanko numericalflowanalysisinarotatingsquareductandarotatingcurvedduct |