Convective heat transfer of supercritical China aviation fuel RP-3 in vertical micro-tube (inner diameter of 1.09mm) was experimentally investigated. Influences of system pressure
heat flux
flow direction and buoyancy on heat transfer were analyzed. Wall heat fluxes (180-460kW/m2)
system import pressure (3-5MPa) and inlet Reynolds number (3200-10200) were maintained in experiments. The result showed that the buoyancy force deteriorated the heat transfer of downward flow in the entrance of test section; system pressure affected the convective heat transfer mainly by the impact of fluid thermal properties; effects of different flow directions on convection heat transfer were very significant. Overall heat transfer was strengthened for downward flow and decreased for upward flow.