流动欠热沸腾空泡份额的研究

Study of Void Fraction in Flow Sub-cooled Boiling

影响欠热沸腾传热的主要因素是含汽率和系统压力。系统压力直接影响加热面上汽泡的大小,从而影响壁面向液体的传热量。欠热沸腾区任一点的热平衡含汽率可由通道内的热工参数和流动参数求出,然后据此求出通道中某点的空泡份额。文中给出了计算加热通道内流动欠热沸腾区空泡份额的计算关系式,该关系式在给定的参数范围内与实验结果符合较好。

The factors with effects on the sub-cooled boiling heat transfer are vapor quality and system pressure. System pressure is with direct effects on the bubble size of the heated surface, and the heat transfer from heated surface to liquid. The thermodynamic quality in sub-cooled boiling region is calculated based on the thermodynamic parameters and flow parameters, and then the void fraction at certain point is calculated. The calculation correlations for the void fraction in sub-cooled boiling channel are given. It is proved that the correlations coincide with the experimental dada within the given experimental parameters.