沸腾系统中的分岔和突变现象

本文利用分岔理论分析了沸腾形态的转变，指出形态转变实际上对应着液相失稳的亚临界分岔和超临界分岔，核化中的不断分岔现象是导致活化核心随机开关和壁温呈混饨特性的主要原因，对传统的等壁温传热模型和人们广泛应用的平均活化核心密度的概念提出了挑战。利用突变理论的基本思想，讨论了沸腾系统中的突变和滞后，深入分析了流速、过冷度和重力对过渡沸腾的影响．

BIFURCATION AND CATASTOPHE PHENOMENA IN BOILING SYSTEM

Bifurcation theory has been used to analyze transition of boiling modes. It is demonstrated that transition of modes is virtually corresponded to the sub-critical bifurcation and supercritical bifurcation of destabilization in liquid-vapor phase. Catastrophe and hysteresis in boiling system have been discussed by use of basic ideas in catastrophe theory.The present investigations challenge the classical linear-and average-based nucleate boiling models. Effects of liquid velocity, sub-cooled degree and gravity on transition boiling have been thoroughly analyzed. It reveals that transition-boiling phenomena tend to disappear at extremely high velocity, sub-cooled degree and gravity.