The local turbulent fluid flow and heat transfer in a rotating two-pass square duct with 19 pairs of in-line 90◦ ribs have been
investigated computationally. A Reynolds-averaged Navier-Stokes equation (RANS) with a two-layer k − ε turbulence model was
solved. The in-line 90◦ ribs were arranged on the leading and trailing walls with rib height-to-hydraulic diameter ratio and pitchto-
height ratio of 0.136 and 10, respectively. The Reynolds number, based on duct hydraulic diameter and bulk mean velocity,
was fixed at 1.0 × 104 whereas the rotational number varied from 0 to 0.2. Results are validated with previous measured velocity
field and heat transfer coefficient distributions. The validation shows that the effect of rotation on the passage-averaged Nusselt
number ratio can be predicted reasonably well; nevertheless, the transversemean velocity and, in turn, the distribution of regionalaveraged
Nusselt number ratio are markedly underpredicted in the regions toward which the Coriolis force is directed. Further
CFD studies are needed.