Numerical predictions of three-dimensional flow and heat transfer are presented for a two-pass square channel with and without 60 deg angled parallel ribs. Square sectioned ribs were employed along one side surface. The rib height-to-hydraulic diameter ratio is 0.125 and the rib pitch-to-height ratio () is 10. The computation results were compared with the experimental data of Ekkad and Han  at a Reynolds number (Re) of 30,000. A multi-block numerical method was used with a chimera domain decomposition technique. The finite analytic method solved the Reynolds-Averaged Navier Stokes equation in conjunction with a near-wall second-order Reynolds stress (second-moment) closure model, and a two-layer isotropic eddy viscosity model. Comparing the second-moment and two-layer calculations with the experimental data clearly demonstrated that the angled rib turbulators and the 180 deg sharp turn of the channel produced strong non-isotropic turbulence and heat fluxes, which significantly affected the flow fields and heat transfer coefficients. The near-wall second-moment closure model provides an improved heat transfer prediction in comparison with the model.
Computation of Flow and Heat Transfer in Two-Pass Channels With 60 deg Ribs
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division March 2, 2000; revision received February 1, 2001. Associate Editor: B. Chung.
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Jang, Y., Chen, H., and Han, J. (February 1, 2001). "Computation of Flow and Heat Transfer in Two-Pass Channels With 60 deg Ribs ." ASME. J. Heat Transfer. June 2001; 123(3): 563–575. https://doi.org/10.1115/1.1371931
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