Numerical Simulation of Turbulent Fluid Flow and Heat Transfer in a Ribbed Rotating Two-Pass Square Duct

Tong-Miin Liou ； Shih-Hui Chen ； Yi-Chen Li

《International Journal of Rotating Machinery》 2005卷 (2005/12) Pp. 152-160

https://doi.org/10.1155/IJRM.2005.152

摘要

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 × 10^4 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 transverse mean velocity and, in turn, the distribution of regional-averaged Nusselt number ratio are markedly underpredicted in the regions toward which the Coriolis force is directed. Further CFD studies are needed.

關鍵字

ribbed rotating duct ； turbulent flow ； heat transfer ； two-layer model ； RANS