Abstract
ABSTRACT The rational approach for estimating afflux at bridge constrictions requires the knowledge of drag coefficient. This paper presents experimental investigations on the variation of drag coefficient with Reynolds number for piers with semicircular nose and tail and lens-shaped nose and tail considering the effects of flow contraction and length-width ratio of piers. It is observed that the drag coefficient varies directly with contraction ratio and length-width ratio of piers. A relation of the form CD1 = CRi e σj αk is also proposed for the experimental range of Rc = 7 × 104 to 5 × 105 for the two shapes of piers.
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