Fig. 1(a–c) shows the configuration of the rectangular channel with ribs mounted on the bottom wall in tandem and alsothe ribs with different attack angles (θ¼01, 151, 301, 451, 601, 751, 1051, 1201, 1351, 1501 and 1651). The flow underconsideration is expected to attain a fully-developed flow condition. Air enters the channel at an inlet temperature, Tin of300 K. In the present work the typical transverse attached-ribs (θ¼901) are also examined for comparison.
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