Characterization of counter-rotating streamwise vortices in flat rectangular channel with one-sided wavy wall

Handle URI:
http://hdl.handle.net/10754/622181
Title:
Characterization of counter-rotating streamwise vortices in flat rectangular channel with one-sided wavy wall
Authors:
Bouremel, Yann; Mitsudharmadi, Hatsari ( 0000-0001-6575-1217 ) ; Budiman, Alexander C.; Winoto, Sonny H.
Abstract:
Particle Image Velocimetry (PIV) has been used to characterize the evolution of counter-rotating streamwise vortices in a rectangular channel with one sided wavy surface. The vortices were created by a uniform set of saw-tooth carved over the leading edge of a flat plate at the entrance of a flat rectangular channel with one-sided wavy wall. PIV measurements were taken over the spanwise and streamwise planes at different locations and at Reynolds number of 2500. Two other Reynolds numbers of 2885 and 3333 have also been considered for quantification purpose. Pairs of counter-rotating streamwise vortices have been shown experimentally to be centred along the spanwise direction at the saw-tooth valley where the vorticity ωz=0ωz=0. It has also been found that the vorticity ωzωz of the pairs of counter-rotating vortices decreases along the streamwise direction, and increases with the Reynolds number. Moreover, different quantifications of such counter-rotating vortices have been discussed such as their size, boundary layer, velocity profile and vorticity. The current study shows that the mixing due to the wall shear stress of counter-rotating streamwise vortices as well as their averaged viscous dissipation rate of kinetic energy decrease over flat and adverse pressure gradient surfaces while increasing over favourable pressure gradient surfaces. Finally, it was also demonstrated that the main direction of stretching is orientated at around 45° with the main flow direction.
KAUST Department:
Clean Combustion Research Center
Citation:
Bouremel Y, Mitsudharmadi H, Budiman AC, Winoto SH (2017) Characterization of counter-rotating streamwise vortices in flat rectangular channel with one-sided wavy wall. Experimental Thermal and Fluid Science 82: 75–82. Available: http://dx.doi.org/10.1016/j.expthermflusci.2016.10.034.
Publisher:
Elsevier BV
Journal:
Experimental Thermal and Fluid Science
Issue Date:
1-Nov-2016
DOI:
10.1016/j.expthermflusci.2016.10.034
Type:
Article
ISSN:
0894-1777
Sponsors:
The authors express their appreciation to Mr. Lucius Sim and Mr. M.N. Adha b Jamaludin for their help in setting up the experimental rig and in collecting the experimental data.
Additional Links:
http://dx.doi.org/10.1016/j.expthermflusci.2016.10.034
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorBouremel, Yannen
dc.contributor.authorMitsudharmadi, Hatsarien
dc.contributor.authorBudiman, Alexander C.en
dc.contributor.authorWinoto, Sonny H.en
dc.date.accessioned2017-01-02T08:42:36Z-
dc.date.available2017-01-02T08:42:36Z-
dc.date.issued2016-11-01en
dc.identifier.citationBouremel Y, Mitsudharmadi H, Budiman AC, Winoto SH (2017) Characterization of counter-rotating streamwise vortices in flat rectangular channel with one-sided wavy wall. Experimental Thermal and Fluid Science 82: 75–82. Available: http://dx.doi.org/10.1016/j.expthermflusci.2016.10.034.en
dc.identifier.issn0894-1777en
dc.identifier.doi10.1016/j.expthermflusci.2016.10.034en
dc.identifier.urihttp://hdl.handle.net/10754/622181-
dc.description.abstractParticle Image Velocimetry (PIV) has been used to characterize the evolution of counter-rotating streamwise vortices in a rectangular channel with one sided wavy surface. The vortices were created by a uniform set of saw-tooth carved over the leading edge of a flat plate at the entrance of a flat rectangular channel with one-sided wavy wall. PIV measurements were taken over the spanwise and streamwise planes at different locations and at Reynolds number of 2500. Two other Reynolds numbers of 2885 and 3333 have also been considered for quantification purpose. Pairs of counter-rotating streamwise vortices have been shown experimentally to be centred along the spanwise direction at the saw-tooth valley where the vorticity ωz=0ωz=0. It has also been found that the vorticity ωzωz of the pairs of counter-rotating vortices decreases along the streamwise direction, and increases with the Reynolds number. Moreover, different quantifications of such counter-rotating vortices have been discussed such as their size, boundary layer, velocity profile and vorticity. The current study shows that the mixing due to the wall shear stress of counter-rotating streamwise vortices as well as their averaged viscous dissipation rate of kinetic energy decrease over flat and adverse pressure gradient surfaces while increasing over favourable pressure gradient surfaces. Finally, it was also demonstrated that the main direction of stretching is orientated at around 45° with the main flow direction.en
dc.description.sponsorshipThe authors express their appreciation to Mr. Lucius Sim and Mr. M.N. Adha b Jamaludin for their help in setting up the experimental rig and in collecting the experimental data.en
dc.publisherElsevier BVen
dc.relation.urlhttp://dx.doi.org/10.1016/j.expthermflusci.2016.10.034en
dc.subjectCounter-rotating vorticesen
dc.subjectWavy wallen
dc.subjectVorticityen
dc.subjectMixingen
dc.subjectStretchingen
dc.titleCharacterization of counter-rotating streamwise vortices in flat rectangular channel with one-sided wavy wallen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalExperimental Thermal and Fluid Scienceen
dc.contributor.institutionTemasek Laboratories, National University of Singapore, Singapore 117411, Singaporeen
dc.contributor.institutionDepartment of Mechanical Engineering, National University of Singapore, Singapore 117576, Singaporeen
dc.contributor.institutionFaculty of Engineering, Universitas Diponegoro, Tembalang Campus, Semarang 50275, Indonesiaen
kaust.authorMitsudharmadi, Hatsarien
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