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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

Abstract

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.