Computation of Flow and Heat Transfer in Two-Pass Channels With 60 deg Ribs
Author:
Jang Yong-Jun1, Chen Hamn-Ching2, Han Je-Chin1
Affiliation:
1. Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123 2. Ocean Engineering Program, Department of Civil Engineering, Texas A&M University, College Station, TX 77843-3136
Abstract
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 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 [1] 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 k-ε 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 k-ε model.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference28 articles.
1. Ekkad, S. V., and Han, J. C., 1997, “Detailed Heat Transfer Distributions in Two-Pass Square Channels with Rib Turbulators,” Int. J. Heat Mass Transf., 40, No. 11, pp. 2525–2537. 2. Han, J. C., and Park, J. S., 1988, “Developing Heat Transfer in Rectangular Channel with Rib Turbulators,” Int. J. Heat Mass Transf., 31, No. 1, pp. 183–195. 3. Bonhoff, B., Parneix, S., Leusch, J., Johnson, B. V., Schabacker, J., and Bolcs, A., 1999, “Experimental and Numerical Study of Developed Flow and Heat Transfer in Coolant Channels with 45deg Ribs,” Int. J. Heat Fluid Flow, 20, pp. 311–319. 4. Schabacker, J., Boelcs, A., and Johnson, B. V., 1999, “PIV Investigation of the Flow Characteristics in an Internal Coolant Passage with 45deg Rib Arrangement,” ASME Paper 99-GT-120. 5. Tse, D. G. N., and Steuber G. D., 1997, “Flow in a Rotating Square Serpentine Coolant Passage with Skewed Trips,” ASME Paper 97-GT-529.
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