Abstract
A fully elliptic numerical study has been carried out to investigate the three-dimensional turbulent developing flow in a helical square duct with large curvature. A two-layer zonal model is proposed and used, in which the whole region is divided into a viscosity-affected near wall layer and a fully turbulent region. A DSM closure is applied in the former, and a one-equation model is solved in the latter. The results presented in this paper cover a Reynolds number range of (1∼10)×104. The development of flow is found to be dominated by radial pressure gradient and Dean-type secondary motion. The distribution of Reynolds stresses in fully developed flow exhibit a complex pattern of turbulence anisotropy. The development of peripherally averaged friction factor and the distribution of local friction factor in fully developed flow are given and discussed.
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Gao, H., Guo, L. Numerical investigation of developing turbulent flow in a helical square duct with large curvature. J. of Therm. Sci. 10, 1–6 (2001). https://doi.org/10.1007/s11630-001-0001-1
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DOI: https://doi.org/10.1007/s11630-001-0001-1