1. Wise, A. F., “Effect due to group of building”, Philosophical Transactions of the Royal Society of London, Series A, Vol.269, 1971, pp. 469-485.
  2. Buckley, F. T. and Marks , C. h., “A wind- tunnel study of the effect of gap flow and gap seals on the aerodynamic drag of tractor- trailer trucks”, T.A.S.M.E., Journal of Fluid Engineering , Vol. 100, December, 1978, pp. 434-438.
  3. Chen, Y. N., “Frequency of the Karman vortex streets in tube Banks”, Journal of the Royal aeronautical society, Vol.71, March 1967, pp. 211-214.
  4. Keith, K., A. Rosko, “An experimental Study of geometrical effect on the drag and flow of two bluff bodies separated by gap”, J. Fluid Mech. (1985), Vol.156, pp.167-204.
  5. Okajima, A., “ Flows around two tandem circular cylinders at very high Reynolds’s numbers”, Bulletin of the JSME, Vol.32, No. 166, April 1979,PP. 504-511.
  6. Lee, B.E , and Fowler, G.R., “ The mean wind force acting on a pair of square prisms “, Build Sci. Vol. 10,1975, PP. 107-110.

Tikrit Journal of Engineering Sciences (2011) 18(4) 10- 19

The Overall Drag Losses for a Combination of Bodies

Sabah Jebour Al-Janabi, Material Engineering Dep., Al- Mustansiriya University, Iraq


The objective of this work is to obtain better understanding of the flow over a combination of bluff bodies in close enough proximity to strongly interact with each other. This interaction is often beneficial in that the drag of the overall system is reduced. Proto-types for this problem come from tractor- trailer and missiles, and from various add-on devices designed to reduce their drag. Thus, an experimental investigation was carried out by placing conical frontal bodies having a base diameter of 0.65-cylinder diameter with different vertex angles (30°, 50°, 70°, and 90°). It was found that, the bluffer cone with 90° vertex angle gives the best minimum drag, which is 31% lower than the drag of the isolated cylinder. Also an interesting phenomenon was observed in that, the minimum drags for all combinations are obtained at the same gap ratio (i.e.at g/d2= 0.365).

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Keywords: Drag loses, bluff bodies, fluid flow.

How to cite

TJES: Al-Janabi SJ. The Overall Drag Losses for a Combination of Bodies. Tikrit Journal of Engineering Sciences 2011; 18(4): 10-19
APA: Al-Janabi S. J., (2011). Axial Dispersion and Back-mixing of Gas Phase in Pebble Bed Reactor. Tikrit Journal of Engineering Sciences, 18(4), 10-19.