Journal
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Volume 49, Issue -, Pages 69-79Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2014.05.011
Keywords
In-line tube banks; Turbulent flow; Turbulence modelling; Large-eddy simulation; Convective heat transfer
Categories
Funding
- HPC Europa-2 Scheme
- EPSRC [EP/G037426/1]
- British Energy Generation
- Engineering and Physical Sciences Research Council [EP/I003010/1] Funding Source: researchfish
- EPSRC [EP/I003010/1] Funding Source: UKRI
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The paper reports experiences from applying alternative strategies for modelling turbulent flow and local heat-transfer coefficients around in-line tube banks. The motivation is the simulation of conditions in the closely packed cross-flow heat exchangers used in advanced gas-cooled nuclear reactors (AGRs). The main objective is the flow simulation in large-scale tube banks with confining walls. The suitability and accuracy of wall-resolved large-eddy simulation (LES) and Unsteady Reynolds-Averaged Navier-Stokes (URANS) approaches are examined for generic, square, in-line tube banks, where experimental data are limited but available. Within the latter approach, both eddy-viscosity and Reynolds-stress-transport models have been tested. The assumption of flow periodicity in all three directions is investigated by varying the domain size. It is found that the path taken by the fluid through the tube-bank configuration differs according to the treatment of turbulence and whether the flow is treated as two- or three dimensional. Finally, the important effect of confining walls has been examined by making direct comparison with the experiments of the complete test rig of Aiba et al. (1982). (C) 2014 Elsevier Inc. All rights reserved.
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