Large Eddy Simulations of Flow and Heat Transfer in Rotating Ribbed Duct Flows
Author:
Tyagi Mayank1, Acharya Sumanta1
Affiliation:
1. Mechanical Engineering Department Louisiana State University Baton Rouge, LA 70803
Abstract
Large eddy simulations are performed in a periodic domain of a rotating square duct with normal rib turbulators. Both the Coriolis force as well as the centrifugal buoyancy forces are included in this study. A direct approach is presented for the unsteady calculation of the nondimensional temperature field in the periodic domain. The calculations are performed at a Reynolds number (Re) of 12,500, a rotation number (Ro) of 0.12, and an inlet coolant-to-wall density ratio Δρ/ρ of 0.13. The predicted time and space-averaged Nusselt numbers are shown to compare satisfactorily with the published experimental data. Time sequences of the vorticity components and the temperature fields are presented to understand the flow physics and the unsteady heat transfer behavior. Large scale coherent structures are seen to play an important role in the mixing and heat transfer. The temperature field appears to contain a low frequency mode that extends beyond a single inter-rib geometric module, and indicates the necessity of using at least two inter-rib modules for streamwise periodicity to be satisfied. Proper orthogonal decomposition (POD) of the flowfield indicates a low dimensionality of this system with almost 99% of turbulent energy in the first 80 POD modes.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference34 articles.
1. Morris, W. D., 1981, Heat Transfer and Fluid Flow in Rotating Coolant Channels, Research Studies Press, Hertfordshire, UK. 2. Wagner, J. H., Johnson, B. V., Graziani, R. A., and Yeh, F. C., 1992, “Heat Transfer in Rotating Serpentine Passages with Trips Normal to the Flow,” ASME J. Turbomach., 114, pp. 847–857. 3. Morris, W. D., and Rahmat-Abadi, K. F., 1996, “Convective Heat Transfer in Rotating Ribbed Tubes,” Int. J. Heat Mass Transfer, 39, pp. 2253–2266. 4. Yamawaki, D., Obi, S., and Masuda, S., 2002, “Heat Transfer in Transitional and Turbulent Boundary Layers with System Rotation,” Int. J. Heat Fluid Flow, 23, pp. 186–193. 5. Acharya, S., and Zhou, F., 2001, “Flow and Heat Transfer in Dimpled Two-pass Channel, in Heat Transfer in Gas Turbine Systems,” Ann. N.Y. Acad. Sci., 934, pp. 424–431.
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