  The study focuses on the steady-state thermohydraulic behavior of the
LiF-BeF2 (FLiBe) molten salt flowing through a compact heat exchanger with
multi louvered fins in the cooling loop of a Molten Salt Reactor (MSR). This
numerical benchmark study was conducted to obtain data both for baseline and
cases with slow coolant circulation problems in the reactor. A series of
numerical tests are conducted for low Reynolds numbers of 100 to 500 based on
the louver pitch with different fin pitches and fin louver angles. The
steady-state velocity profiles, temperature, and pressure fields are studied in
detail. The heat transfer coefficient and pressure drop data are reported in
terms of Colburn j-factor and Fanning friction factor f, and the volume
goodness factor to get a performance comparison for FLiBe as the coolant in a
Molten Salt Reactor. As regards findings of the analyses, when the louver angle
steeps, the molten salt flow becomes more louvered direct which improves the
interaction and heat transfer between the fin and molten salt. On the contrary,
when the fin pitches increase, the flow becomes duct-directed that reducing the
contact between fin and FLiBe which leads to a decline in thermal performance.
