摘要
应用激光散射方法和透射消光方法，对戊醇在２５０Ｋ、１．０ｂａｒ状态附近同质核化凝结过程中微滴浓度和尺度进行了测算，并根据脉冲成核时间长短确定了戊醇同质核化率大小。实验结果表明：戊醇在携带气体—氦气中，在２５０Ｋ、１．０ｂａｒ附近的同质核化率范围为１．６０３×１０１５～６．６４５×１０１５ｍ－３ｓ－１，相应的饱和比范围为１３．０４～２０．７６。
Laser scattering and laser transmitting methods are used to detect and evaluate the droplet size and the droplet concentration in Pantonal vapor during its homogeneous nucleation and condensation in the condition 250 and 1.0 bar. The rate of homogeneous nucleation for the vapor is then calculated based on the duration of nucleation pulse which is observed in an expansion shock tube. It is found that the numerical range for the rate is about 1.603×1015～6.645×1015 m-3s-1 under the given condition, and therefore, the supersaturation of the vapor is between 13.04 and 20.76.
出处
《实验力学》
CSCD
北大核心
1998年第2期139-144,共6页
Journal of Experimental Mechanics
基金
国家自然科学基金
中科院"九五"基础性研究重点项目
关键词
激光散射
激光透射
消光
同质核化率
相变
laser scattering, laser transmitting and exinction, homogeneous nucleation rate
