Figure 15 Nusselt number ratio distribution for case a

In first pass, it migrates diagonally away from the corner of inner-leading surfaces toward the center of the passage, and in second pass from the corner of the inner-trailing surfaces toward the center of the passage (as explained in Fig. 1.4-a). Thus, the Nusselt number ratio for the trailing surface first pass and the leading surface second pass for channel orientation b =90° are higher than the ratio for channel orientation b=135°. The opposite situation is observed in the leading surface first pass and trailing surface second pass: the b=135° case has higher Nusselt number ratio when compare to the b =90° channel orientation. The results also show that the effect of rotation decreases with increasing Reynolds number (or decreasing rotation number).

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