TY - GEN
T1 - Experimental study of drag reduction on circular cylinder and reduction of pressure drop in narrow channels by using a cylinder disturbance body
AU - Widodo, Wawan Aries
AU - Hidayat, Nuzul
PY - 2014
Y1 - 2014
N2 - This paper present the results of drag reduction on circular cylinder and reduction of pressure drop in narrow rectangular channels by using circular disturbance body. This study focused on the phenomenon when the flow through the arrangement of the circular cylinder, separation will occur at a specific point on a circular cylinder resulting drag force. When the separation can be delayed so that the resulting drag force will be smaller. This can be done in various ways, one of which is by using a cylinder disturbance body on the upper and lower side near the bluff body. This study will be conducted in a wind tunnel experiments which have narrow channels with a square crosssectional area of 125 mm × 125 mm and a blockage ratio of 26.4% and 36.4%. Specimens used circular cylinder with 25 mm diameter (d/D= 0.16) and 37.5 mm (d/D= 0.107) as well as the circular disturbance body with a diameter of 4 mm. cylinder disturbance body placed on the upper and lower side with the position α=20° to 60° and spacing (δ=0.4 mm) to the main circular cylinder. Reynolds number based on the hydraulic diameter of 5.21×104 to 15.6×104. The results of this research show the effect of using circular disturbance body on circular cylinder and the characteristics of fluid flow on a narrow channel square cross section. At a certain position of the circular disturbance body provide value pressure drop reduction on narrow channels and drag reduction when compared to a single circular cylinder. From the experimental data presented in this paper it is observed that the position angle of circular disturbance body to reduce drag force on a circular cylinder and reducing the pressure drop in the channel are at angle 20° and 30° for D=25 mm, and 20°, 30° and 40°, respectively, for D= 37.5 mm then the best reduction for both cylinders are at an angle of 30°.
AB - This paper present the results of drag reduction on circular cylinder and reduction of pressure drop in narrow rectangular channels by using circular disturbance body. This study focused on the phenomenon when the flow through the arrangement of the circular cylinder, separation will occur at a specific point on a circular cylinder resulting drag force. When the separation can be delayed so that the resulting drag force will be smaller. This can be done in various ways, one of which is by using a cylinder disturbance body on the upper and lower side near the bluff body. This study will be conducted in a wind tunnel experiments which have narrow channels with a square crosssectional area of 125 mm × 125 mm and a blockage ratio of 26.4% and 36.4%. Specimens used circular cylinder with 25 mm diameter (d/D= 0.16) and 37.5 mm (d/D= 0.107) as well as the circular disturbance body with a diameter of 4 mm. cylinder disturbance body placed on the upper and lower side with the position α=20° to 60° and spacing (δ=0.4 mm) to the main circular cylinder. Reynolds number based on the hydraulic diameter of 5.21×104 to 15.6×104. The results of this research show the effect of using circular disturbance body on circular cylinder and the characteristics of fluid flow on a narrow channel square cross section. At a certain position of the circular disturbance body provide value pressure drop reduction on narrow channels and drag reduction when compared to a single circular cylinder. From the experimental data presented in this paper it is observed that the position angle of circular disturbance body to reduce drag force on a circular cylinder and reducing the pressure drop in the channel are at angle 20° and 30° for D=25 mm, and 20°, 30° and 40°, respectively, for D= 37.5 mm then the best reduction for both cylinders are at an angle of 30°.
KW - Circular cylinder
KW - Circular disturbance body (CBD)
KW - Drag force
KW - Pressure drop
UR - http://www.scopus.com/inward/record.url?scp=84892867050&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMM.493.198
DO - 10.4028/www.scientific.net/AMM.493.198
M3 - Conference contribution
AN - SCOPUS:84892867050
SN - 9783037859902
T3 - Applied Mechanics and Materials
SP - 198
EP - 203
BT - Advances in Applied Mechanics and Materials
T2 - International Conference on Mechanical Engineering, ICOME 2013
Y2 - 19 September 2013 through 21 September 2013
ER -