过热液中汽泡生长初期阶段特性  

Characteristics of Bubble Growth in Initial Period in Superheated Liquid

作　　者：刘朝[1,2,3] 张华玲 许建峰[1,2,3] 曾丹苓 

机构地区：[1]重庆大学热能工程学院 [2]重庆建筑高等专科学校 [3]上海卫星工程研究所

出　　处：《上海交通大学学报》1999年第8期993-996,共4页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金

摘　　要：依据非平衡热动力学相变理论建立了在均匀过热液中的汽泡生长模型．该模型中引入多变热，以保证汽泡在正化学势差作用下长大．采用数值计算方法，对汽泡生长的初始阶段特性进行了研究．计算表明，汽泡在此生长阶段存在滞后和自适应调节现象，滞后时间与引入的不同温度、压力、速度等扰动量的强度有关．在一定范围内。A model for the growth of vapor bubble in homogeneous superheated liquid was built up according to non equilibrium thermodynamic theory of phase change. Polytropic heat was introduced in the model to guarantee the bubble's growth under the action of positive chemical potential difference between two phases. The study of the characteristics of bubble growth in initial period was carried out by numerical calculation. It is found that there exists relaxation and self adjustation phenomena in the initial period of bubble growth process. Relaxation time depends on the intensity of the disturbance of temperature, pressure and velocity. However, the curve of bubble growth is less affected by the intensity of disturbance within a certain range.

关 键 词：非平衡热力学 汽泡生长 核沸腾 数值计算 

分 类 号：TK121[动力工程及工程热物理—工程热物理]