二元正烷烃液态混合物加压时的过热极限

The limit of superheat for binary liquid mixtures of n-alkaline at high pressure

:建立了适用于链烷烃类系统的过热极限的动力学计算方法。采用发展的动态液滴技术 (悬浮液滴法 ) ,测定了正戊烷与正庚烷、正辛烷、正壬烷二元混合物的过热极限温度。实验结果表明 ,过热极限温度(在一定组成条件下 )随外压的增加而升高 ,且过热极限温度与外压基本呈线性关系 ;与组分的摩尔分数 (在固定压力下 )

The equation of nucleation rate for binary n-alkaline mixture was establised by the homogeneous nucleation theory.The method of the limit of superheat of liquid was evaluated.Using developed dynamic drop technique(floating droplet method),we measured the limits of superheat of n-pentane and n-heptane、n-nonane systems of binary n-alkaline mixtures. The nucleation temperature was found to be nearly linear to liquid phase mole fraction in n-alkaline mixtures in the whole pressure range in which the experiments were preformed. The nucleation temperature was found to be nearly linear to ambient pressure of mixture at a given compostion.