Preliminary Heat-Transfer Results with a Molten Salt Mixture Containing LiF-BeF₂-ThF₄-UF₄ Flowing Inside a Smooth, Horizontal Tube

Technical Report · Thu Sep 25 00:00:00 EDT 1969

DOI:https://doi.org/10.2172/1524602· OSTI ID:1524602

Cox, B. ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Heat-transfer coefficients were determined experimentally for a proposed MSBR fuel salt (LiF-BeF₂-ThF₄-UF₄; 67.5-20.0-12.0-0.5 mole %) flowing by forced convection through a 0.18-in.-ID horizontal, circular tube for the following range of variables: Reynolds modulus 400 — 30,600, Prandtl modulus 4 — 14, Average fluid temperature (°F) 1050 — 1550, Heat flux (Btu/hr∙ft²) 22,000 — 560,000. Within these ranges, the heat-transfer coefficient was found to vary from 320 up to 6900 Btu/hr∙ft²∙°F (Nusselt modulus of 6.5 to 138). Correlations of the experimental data resulted in the equations: N_Nu = 1.63 [N_Re N_Pr (D$$/$$L]^0.35 (μ$$/$$μ_s)^0.14, with an average absolute deviation of 5.7% for N_Re < 1000; N_Nu = 0.089 (N$$^{2/3}_{Re}$$ — 125) N$$^{1/3}_{Pr}$$ (μ$$/$$μ_s)^0.14 with an average absolute deviation of 4.5% for 3500 < N_Re < 12,000; and N_Nu = 0.0217 N$$^{0.8}_{Re}$$ N$$^{1/3}_{Pr}$$ (μ$$/$$μs)^0.14, with an average absolute deviation of 4.9% for N_Re > 12,000.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; US Atomic Energy Commission (AEC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1524602
• Report Number(s): CF-69-9-44
• Country of Publication: United States
• Language: English

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