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International Journal of Rotating Machinery
Volume 7, Issue 3, Pages 195-208
http://dx.doi.org/10.1155/S1023621X01000185

Numerical Prediction of Flow and Heat Transfer in a Two-pass Square Channel with 90° Ribs

1Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A & M University, College Station, TX 77843, USA
2Ocean Engineering Program, Department of Civil Engineering, Texas A & M University, College Station, TX 77843, USA

Received 5 May 2000; Revised 27 May 2000

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Numerical predictions of three-dimensional flow and heat transfer are presented for a two-pass square channel with ° parallel ribs. Square sectioned ribs were employed along the one side surface. The rib height-to-hydraulic diameter ratio (e/Dh) is 0.125 and the rib pitch-to-height ratio (P/e) is 10. The computation results were compared with the experimental data of Ekkad and Han (1997) 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 (secondmoment) closure model, and a two-layer k − ε isotropic eddy viscosity model. Comparing the second-moment and two-layer calculations with the experimental data clearly demonstrated that the rib turbulators and the 180° 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 k − ε model.