The convective heat transfer of supercritical-pressure RP-3 (Rocket Propellant 3) aviation kerosene in a horizontal circular tube has been numerically studied

focusing mainly on the non-uniform heat transfer deterioration along the circumferential direction. The governing equations of mass

momentum and energy have been solved using the pressure-based segregated solver based on the finite volume method. The re-normalization group (RNG)

k-ε

turbulence model with an enhanced wall treatment was selected. Considering the heat conduction in the solid wall

the mechanism of heat transfer deterioration and the buoyancy effect on deteriorated heat transfer were discussed. The evolution of secondary flow was analyzed. Effects of the outer-wall heat flux

mass flux

pressure and tube thermal conductivity on heat transfer were investigated. Moreover

the buoyancy criterion and the heat transfer correlation were obtained. Results indicate that the poor flow performance of near-wall fluid causes the pseudo-film boiling

further leads to the heat transfer deterioration. The strong buoyancy has an effect of enhancing the heat transfer at the bottom of tube

and weakeni

ng the heat transfer at the top of tube

which results in the non-uniform inner-wall temperature and heat flux distributions. Decreasing the ratio of outer-wall heat flux and mass flux

increasing the pressure could weaken the heat transfer difference along the circumferential direction

while the effect of thermal conductivity of tube on the circumferential parameters distributions is more complicated. When the buoyancy criterion of (

Gr

q

/

Gr

th

)

max

≤ 0.8 is satisfied

the effect of buoyancy could be ignored. The new correlations work well for non-uniform heat transfer predictions.