The experiment result indicates that the maldistribution would be caused by the ordinary industrial header for the internal flow of the plate-fin heat exchanger, while the maldistribution parameters and the maximum velocity ratio can be effectively reduced by perforated plate header configuration, the effect of flow distribution can be greatly improved, the effect will be more obvious with the increase of Re.
Based on our study on the flow maldistribution in a plate-fin heat exchanger, the exit temperature distribution in the heat exchanger under the secondary header configuration was experimentally studied.
2) 3D solid geometric model and finite element model is set up, and the stress intensity (SINT) analysis and evaluation went on firstly, then, the heat-structural stress analysis is continued by coupling with temperature field, further, the influence for the strength of special head coming from mechanical loads and heat loads is studied.
Based on numerical simulation,the flow distributions of the ordinary header and three improved headers was studied with PIV,and a series of velocity streamline graphs of different cross sections were obtained.
Calculation of stress analysis is made of the cam sealing head of pressure vessels under internal pressure by finite unity as regards the structure of sealing heads, connection of sealing heads with cylinder hole position and joint structure of joining pipes and sealing heads, thus giving its reasonable structure.