Study on mechanism of turbulent flow and heat transfer in rotating passages

A two-equation turbulence model with additional term for Coriolis and buoyancy is used to study the mechanism of various force action and interaction effect in rotating serpentine passages. The simulation results in rotating serpentine passages are almost consistent with the experimental data. Then, numerical tests are carried out for cases with only Coroilis force, buoyancy force caused by Coroilis force, buoyancy force caused by centrifugal force, Coroilis force and its buoyancy force, and all forces caused by rotation respectively. The results indicates that the buoyancy, the angular acceleration forces and the cross-stream secondary flow caused by unbalance distribution of Corilis forces affect the convective heat transfer. Coroilis force plays an important role in flow and heat transfer in rotational passage. Coroilis force increases pressure loss in the passage with ribs while centrifugal buoyancy force decreases pressure loss.