A resultant mechanical model for the forming process of cone boss;

By analyzing cone bosses forming mechanism in different bulk formations,the forming process of cone bosses was divided into two characteristic time-intervals based on modular design method,one being extrusion processing,and the other being the process of the die corner overflowed by deformable body.

Stressing influences such as the train longitudinal force and lateral force (that is temperature load) on shear cam are taken into account and calculation formulas of shear cam force caused by these factors are deduced.

In this paper,the transition from churn flow to annular flow for upward gas-liquid in vertical concentric annulus is studied and a transition model is developed by considering the structural feature of the concentric annulus and the flow characteristics for churn and annular flows in the concentric annulus.

The transition from slug flow to churn flow for upward gas liquid in vertical concentric annulus is studied and a transition model is developed considering the structural feature of the concentric annulus and the flow characteristics for slug and churn flow in the concentric annulus.

The concentric ring slit flow theory of fluid mechanics ,which is flow rate and pressure difference formula ,is usually used for analysis, research and engineering calculation in hydraulics problems, but the formula origin in general references which is based on the ordinary analysis of parallel plate (plain) pressure flow theory is not refined mathematics analysis .