TY - JOUR
T1 - Development of Pre-set Counter-rotating Streamwise Vortices in Wavy Channel
AU - Budiman, A.C.
AU - Mitsudharmadi, Hatsari
AU - Bouremel, Y.
AU - Winoto, S.H.
AU - Low, H.T.
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2015/10/25
Y1 - 2015/10/25
N2 - Development of counter-rotating streamwise vortices in a rectangular channel with one-sided wavy surface has been experimentally quantified using hot-wire anemometry. The wavy surface has fixed amplitude of 3.75 mm. The counter-rotating vortices are pre-set by means of a sawtooth pattern cut at the leading edge of the wavy surface. Variations of the central streamwise velocity Uc with a channel gap H = 35 mm and 50 mm (corresponding to a Reynolds number from 1600 to 4400) change the instability of the flow which can be distinguished from the velocity contours at a certain spanwise plane. The streamwise velocity contours and turbulence intensity for Reynolds number Re = 3100 and H = 35 mm show the disappearance of the mushroom-like vortices prior to turbulence near the second peak of the wavy surface, while for higher Re, this phenomenon occurs earlier. Under certain conditions, for example, for Re = 4400 and H = 50 mm, the splitting of the vortices can also be observed.
AB - Development of counter-rotating streamwise vortices in a rectangular channel with one-sided wavy surface has been experimentally quantified using hot-wire anemometry. The wavy surface has fixed amplitude of 3.75 mm. The counter-rotating vortices are pre-set by means of a sawtooth pattern cut at the leading edge of the wavy surface. Variations of the central streamwise velocity Uc with a channel gap H = 35 mm and 50 mm (corresponding to a Reynolds number from 1600 to 4400) change the instability of the flow which can be distinguished from the velocity contours at a certain spanwise plane. The streamwise velocity contours and turbulence intensity for Reynolds number Re = 3100 and H = 35 mm show the disappearance of the mushroom-like vortices prior to turbulence near the second peak of the wavy surface, while for higher Re, this phenomenon occurs earlier. Under certain conditions, for example, for Re = 4400 and H = 50 mm, the splitting of the vortices can also be observed.
UR - http://hdl.handle.net/10754/581244
UR - http://linkinghub.elsevier.com/retrieve/pii/S0894177715002927
UR - http://www.scopus.com/inward/record.url?scp=84945538912&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2015.10.016
DO - 10.1016/j.expthermflusci.2015.10.016
M3 - Article
VL - 71
SP - 77
EP - 85
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
ER -