抄録
With the theory of Reynolds Stress Model applied, a mathematical model of the flow and heat transfer of the helical baffles heat exchanger is established. The commercial software FLUENT is used to the shell-pass velocity and temperature fields of helical baffles heat exchanger by unstructured grid. The numerical simulation results at the 35° helix inclination angle are compared with those of experiment.
The obtained results of three-dimensional shell-pass flow and temperature distribution indicates that the boundary layer gets thinner along with the flow volume turns larger. The velocity in the shell-pass decreases and then increases along radial direction. Based on the simulation of velocity and temperature distribution, the secondary flow is found in shell-pass, which accelerates the fluid mixing and promotes the heat transfer capability. The flow loss increases sharply at the inflow region and near the baffles.
