| Popis: |
In this study calculated dependences for minimum critical heat flux at transient heat generation are presented, based on the model description of crisis onset mechanism. It is shown, that the character of the influence relative pressure on value of transient critical heat flux in nitrogen essentialy depends on presence of heterogeneous centers of nucleation on heat generating surface. Comparison experimental and calculating data are carried. Then by using numeral method the problem about spreading of boundary between film boiling regime and nucleate one arising in nonisothermal zone on heater edge is decide on the basis consideration equation of transient heat conductivity in heater with heat flowing into liquid and setting condition at the front. |
