【摘要】 根据单个气泡的生长特点,考虑液氢的热效应和气泡内部温度分布,通过联立求解热平衡方程、热扩散方程、Rayleigh-Plesset方程和半无限大空间的导热方程构建了单个气泡生长的数理模型。通过液氮工质中气泡的生长实验结果验证了模型的正确性,进而对比了几种典型低温工质中气泡半径的热力学生长过程,分析了不同工质热效应参数对气泡半径和半径临界时间的影响。此外还研究了液氢中单个气泡的半径生长过程和半径临界时间随环境压力和过热度的变化规律。更多还原

【Abstract】 According to the characteristics of single bubbles growth, the model of bubble growth was proposed by considering thermal properties of different media and temperature distribution inside the bubble,solving the heat balance equation,heat diffusion equation,Rayleigh-Plesset equation and heat conduction equation of semi-infinite space simultaneously. The model was verified by the experimental results of liquefied nitrogen( LN2) bubble growth. Furthermore, the growth process of bubble radius in several typical cryogenic media was compared,and the influence of thermal effect parameter analysis of media on bubble radius and critical time of radius was analyzed. In addition,the radius growth process and critical time of single bubble in liquified hydrogen were studied with the change of ambient pressure and superheat.更多还原