Computational Analysis of Heat Transfer Enhancement in Square Ducts With V-Shaped Ribs: Turbine Blade Cooling
Author:
Jia R.1, Sunde´n B.1, Faghri M.2
Affiliation:
1. Division of Heat Transfer, Lund Institute of Technology, P.O. Box 118, 221 00 Lund, Sweden 2. Mechanical Engineering & Applied Mechanics, University of Rhode Island, Kingston, Rhode Island 02881
Abstract
Experimental studies have revealed that both downstream and upstream pointing V-shaped ribs result in more heat transfer enhancement than transverse straight ribs in ducts. However, based on the available experimental results, contradiction exists whether the upstream or the downstream pointing V-shaped ribs orientation is superior for better enhancement in heat transfer. Further investigations are thus needed concerning the heat transfer and fluid flow phenomena in ducts with V-shaped ribs to clarify this. In the present investigation a numerical approach is taken and the heat and fluid flow is numerically simulated by a multi-block parallel 3D solver. For turbulence modeling, the v2¯ f-kε model is employed but results from previous EASM calculations are also considered in analyzing and attempting to understand the various experimental data. Large eddy simulations (LES) are also carried to evaluate the accuracy and reliability of the results of Reynolds-averaged Navier-Stokes (RANS) methods and to understand the underlying physical phenomena. It is suggested that the discrepancy between the various experiments most probably is due to the measurement methods, or the number of sampling points. With the TC (thermocouples) technique, a few sampling points are not sufficient to represent the heat transfer behavior in V-shaped ribs, due to the uneven distribution of the heat transfer coefficients.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference37 articles.
1. Han, J. C., Glicksman, L. R., and Rohsenow, W. M., 1978, “Investigation of Heat-Transfer and Friction for Rib-Roughened Surfaces,” Int. J. Heat Mass Transfer, 21(8), pp. 1143–1156. 2. Han, J. C., Zhang, Y. M., and Lee, C. P., 1991, “Augmented Heat Transfer in Square Channels With Parallel, Crossed, and V-Shaped Angled Ribs,” ASME J. Heat Transfer, 113, pp. 590–596. 3. Metzger, D. E., Fan, C. S., and Yu, Y., 1990, “Effects of Ribs Angle and Orientation on Local Heat Transfer in Square Channels With Angled Roughness Ribs,” in Compact Heat Exchangers, edited by R. K. Shah, A. D. Kraus, and D. E. Metzger, Hemisphere Publishing Corporation, New York, pp. 151–167. 4. Taslim, M. E., Liu, T., and Kercher, D. M., 1996, “Experimental Heat Transfer and Friction in Channels Roughened With Angled, V-Shaped, and Discrete Ribs on Two Opposite Walls,” ASME J. Turbomach., 118(1), pp. 20–28. 5. Liou, T. M., Hwang, J. J., and Chen, S. H., 1993, “Simulation and Measurement of Enhanced Turbulent Heat Transfer in a Channel With Periodic Ribs on One Principal Wall,” Int. J. Heat Mass Transfer, 36(2), pp. 507–517.
Cited by
28 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
|
|