Abstract
Present work is an experimental study of flow over array of trapezoidal-ribs transversely placed on the wider bottom surface of the rectangular passage. It is intended to study the profound impact of taper angle variation (0 to 20°) on the flow mechanism, and subsequently on heat transfer improvement. The local and augmentation heat transfer patterns have been investigated using liquid crystal thermography (LCT). Further, the aerodynamic characteristics, in a module between seventh and eight ribs, have been obtained using particle image velocimetry (PIV) for understanding the flow physics. Existence of large- and small-scale coherent structures within the detached shear layer zone have been confirmed and further explained by means of critical points. As compared to square rib, trapezoidal rib provides higher heat transfer rate just downstream of the rib, which is observed to be in line with the fluid flow results.
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