激光散射、透射消光方法应用于测量同质核化率的实验研究  

Experimental Study on the Rate of Homogeneous Nucleationwith Method of Laser Scattering and Transmitted Extinction

作　　者：傅云飞[1] 尹协振[1] 王强[1] 苏深健 C.C.M.Luijten O.D.E.Baas M.E.H.vanDongen 

机构地区：[1]中国科学技术大学

出　　处：《实验力学》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

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 1.603×1015～6.645×1015 m-3s-1 under the given condition, and therefore, the supersaturation of the vapor is between 13.04 and 20.76.

关 键 词：激光散射 激光透射 消光 同质核化率 相变 

分 类 号：O552.6[理学—热学与物质分子运动论]