Based on the structural features

the simplified physical model of the half-coil jacket was proposed. On the boundary condition of constant thermal load

the developed flow field and the temperature field in the half-coil jackets were analyzed by a numerical method. The results were compared with the velocity field measured by the laser Doppler velocimetry and the experimental results reported in the literatures. The effects of the jacket structures and the fluid Prandtl number on the flow and heat transfer characteristics were investigated. The results show that on the laminar condition

there are two eddies of secondary flow on the cross-section of the half-coil jacket. With the increase of curvature k

the value of stream function and the flow resistance increase while the intensity of secondary flow eddies enhances. The secondary flow can enhance the heat transfer in the half-coil jacket. On the condition of a larger k value and a smaller Pr

the relative effect of secondary flow on the heat transfer enhancement is more evidence. With the increase of k or Pr

the heat transfer in the jackets can be enhanced

but the effects of k and Pr on the heat transfer enhancement are different. The center of the heat transfer surface in the jacket is the critical area which should be enhanced for heat transfer.