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Liu, Limin; Zhang, Dalin; Li, Linfeng; Yang, Yicheng; Wang, Chenglong; Qiu, Suizheng; Su, G.H.
Applied thermal engineering, 12/2018, Letnik: 145Journal Article
•A pebble bed test facility with internal heat source is setup for FHRs.•High-Pr Dowtherm A at low temperature simulates high-temperature FLiBe.•Flow regime transition criteria is setup.•Flow and convective heat transfer correlations are obtained for FLiBe in FHRs. For Fluoride-salt-cooled High-temperature Reactors (FHRs), a pebble bed experimental facility with internal heat generation is set up, using the Dowtherm A as the simulant fluid. Dowtherm A can match the Prandtl number of FLiBe of 520–700 °C at a low temperature range of 45–105 °C. The effects of inlet temperatures, porosity and mass flow rate are investigated on the flow and convective heat transfer characteristics. A criterion is determined for the flow regime transition from the transitional to turbulent flow. The existing correlations are unable to predict the Blake-type friction factor in the transitional flow and show mixed performance in the turbulent flow. The present empirical correlations generally underestimate the convective heat transfer coefficients of the high-Prandtl-number fluid in the pebble bed. New correlations are proposed for predicting the flow and convective heat transfer coefficients with Prandtl number at 14–19 and Reynolds number at 90–2500.
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