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Molten salt-based nanofluid in a laminar region of a circular tube with  constant wall heat flux was numerically investigated. An Eulerian-  Lagrangian method, discrete phase model, was used to predict the heat  transfer performance of nanofluid, considering the factors of inlet Reynolds  number, the mass concentration of the nanoparticles and nanoparticle  diameter. Validation results were found in a good match with experimental  results obtained from the literature. Numerical results showed that the heat  transfer performance of nanofluid was considerably better than that of pure  molten salt. The local heat transfer coefficient and Nusselt number of  nanofluid are about 30% higher than these of pure molten salt and increase  with an increase of Reynolds number and nanoparticle concentration.  Moreover, the heat transfer performance of nanofluid with the small size of  the nanoparticles (10~100 nm) is improved significantly.

Numerical investigation of molten salt-based nanofluid laminar heat transfer in a circular tube using Eulerian-Lagrangian method