首页|Convective heat transfer and friction factor characteristics of molten salts in spirally fluted tubes
Convective heat transfer and friction factor characteristics of molten salts in spirally fluted tubes
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NSTL
Elsevier
Spirally fluted tubes have been widely used for heat exchangers due to their superior heat transfer enhancement. However, most of the previous studies focused on the effects of a limited number of geometric parameters, i.e., the flute pitch and flute depth, on convective heat transfer and friction factor characteristics of low-Prandtlnumber fluids, i.e., air and water. The correlations developed in these studies may not be accurate or applicable for medium-Prandtl-number fluids, such as molten salts. A numerical analysis using a Computational Fluid Dynamics (CFD) tool, STAR-CCM+, is therefore carried out in this study to systematically investigate the effects of four geometric parameters, including the flute pitch p, flute depth e, flute start number N-s (or flute helix angle theta), and trough length L-tr on convective heat transfer and friction factor characteristics of a medium-Prandtlnumber fluid, FLiNaK (46.5LiF-11.5NaF-42KF mol %), in spirally fluted tubes. In addition, the convective heat transfer and Darcy friction factor correlations are proposed and validated, with +/- 20% uncertainties, for medium-Prandtl-number fluids under the following conditions: Re = 88-1600, Pr = 2.5-40, p/Dc = 0.44-3.51, e/D-c = 0.10-0.40, theta/90 = 0.20-0.81, and L-tr/D-c = 0.71-2.16. The correlations proposed help improve the design of spirally fluted-tube heat exchangers.
NSTL
Elsevier
