TY - JOUR
T1 - Effects of tapes with double-sided delta-winglets on heat and vortex characteristics
AU - Yakut, Kenan
AU - Sahin, Bayram
AU - Celik, Cafer
AU - Alemdaroglu, Nihal
AU - Kurnuc, Aslihan
PY - 2005/1
Y1 - 2005/1
N2 - An experimental study was carried out for tapes with double-sided delta-winglets under different geometrical and flow parameters, including angles of attack (90°, 60° and 30°), winglet heights (8, 12 and 16 mm), pitch arrangements (25, 50 and 75 mm) and Reynolds numbers (3690, 10493 and 16906). By using the Taguchi experimental-design method, the optimum parameters of the turbulator were determined by obtaining the Nusselt number, friction factor, amplitude of fluctuation pressure of the vortices and the vortex-shedding frequency. First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals, and the optimum results were obtained at a Reynolds number of 16906, 25 mm pitch, 8 mm height of winglet and 30° angle of attack, so that vortex-shedding frequencies are maximised. For lower frequencies, optimum conditions occurred at a Reynolds number of 16906 for 75 mm pitch, 8 mm height of winglet and 60° angle of attack.
AB - An experimental study was carried out for tapes with double-sided delta-winglets under different geometrical and flow parameters, including angles of attack (90°, 60° and 30°), winglet heights (8, 12 and 16 mm), pitch arrangements (25, 50 and 75 mm) and Reynolds numbers (3690, 10493 and 16906). By using the Taguchi experimental-design method, the optimum parameters of the turbulator were determined by obtaining the Nusselt number, friction factor, amplitude of fluctuation pressure of the vortices and the vortex-shedding frequency. First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals, and the optimum results were obtained at a Reynolds number of 16906, 25 mm pitch, 8 mm height of winglet and 30° angle of attack, so that vortex-shedding frequencies are maximised. For lower frequencies, optimum conditions occurred at a Reynolds number of 16906 for 75 mm pitch, 8 mm height of winglet and 60° angle of attack.
KW - Delta-winglet
KW - Flow-induced vibration
KW - Heat-transfer enhancement
KW - Taguchi method
UR - http://www.scopus.com/inward/record.url?scp=5044242101&partnerID=8YFLogxK
U2 - 10.1016/j.apenergy.2004.03.003
DO - 10.1016/j.apenergy.2004.03.003
M3 - Article
AN - SCOPUS:5044242101
SN - 0306-2619
VL - 80
SP - 77
EP - 95
JO - Applied Energy
JF - Applied Energy
IS - 1
ER -