The Effect of Angle of Attack on Pressure Drag from a Cam Shaped Tube
Authors: Arash Mir Abdolah Lavasani
The pressure drag from a cam shaped tube in cross flows have been investigated experimentally using pressure distribution measurement. The range of angle of attack and Reynolds number based on an equivalent circular tube are within 0≤α≤360° and 2×104< Reeq < 3.4 ×104, respectively. It is found that the pressure drag coefficient is at its highest at α=90° and 270° over the whole range of Reynolds number. Results show that the pressure drag coefficient of the cam shaped tube is lower than that of circular tube with the same surface area for more of the angles of attack. Furthermore, effects of the diameter ratio and finite length of the cam shaped tube upon the pressure drag coefficient are discussed.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1334321Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1997
 T. Ota, S.Aibaa, T.Tsuruta and M.Kaga, "Forced Convection Heat Transfer from an Elliptic Cylinder of Axis Ratio 1:2," Bulletin of JSME, Vol.26, no.212,1983, pp.262-267.
 G. P.Merker and H.Hanke, "Heat transfer and pressure drop on the shell-side of tube-banks having oval-shaped tubes," International Journal of Heat and Mass Transfer, Vol.29, no.12, 1986, pp.1903-1909.
 T.Ota and H.Nishiyama, "Flow around two elliptic cylinders in tandem arrangement," Journal of Fluids Engineering, Transactions of the ASME, Vol.108, no.1, 1986, pp.98-103.
 B.V.S.S.S.Prasad, A.A.Tawfek and V.R.M.Rao, "Heat Transfer from Aerofoils in Cross-Flow," International Communications in Heat and Mass Transfer, Vol.19, 1992, pp.870-890.
 H. M. Badr, "Force convection from a straight elliptical tube," Journal of Heat and Mass Transfer, Vol.34, 1998, pp.229-236.
 A.Hasan, , Sirén, K., "Performance investigation of plain circular and oval tube evaporatively-cooled heat exchangers", Applied Thermal Engineering, Vol.24, 2004, pp.777-790.
 R.S.Matos, T.A.Laursen, J.V.C.Vargas and A.Bejan, "Threedimensional optimization of staggered finned circular and elliptic tubes in forced convection," International Journal of Thermal Sciences, Vol. 43, 2004, pp.477-487.
 D.Bouris, E.Konstantinidis, S.Balabani, D.Castiglia, and G.ergeles, "Design of a novel, intensified heat exchanger for reduced fouling rates," International Journal of Heat and Mass Transfer, Vol.48, 2005 pp.3817-3832.
 F.White, Fluid Mechanics, Mc Graw-Hill, New York, 2005.