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为了揭示自由落体条件下偏晶合金壳核组织的形成机制,基于相似性原理设计了一种环形温度场,对丁二腈-52.6mol%H2O偏晶溶液的相分离过程进行了实时观测.发现在两个不混溶液相的分离过程中,富水相液滴经历了“析出→迁移→凝并→聚集”运动过程,最终形成以富水相为中心的两层壳核组织.同时测定了液滴的运动速率,并对Marangoni迁移速率进行了理论计算,两者能够较好地符合.由此证实了在偏晶溶液的相分离过程中,第二液相主要是在温度梯度的驱动下产生Marangoni迁移.这一实验直观地再现了落管无容器处理过程中液滴内部的相分离过程.
In order to reveal the formation mechanism of the astemizuma nuclei under free-fall condition, a ring-shaped temperature field was designed based on similarity principle, and the phase separation of succinonitrile-52.6 mol% H 2 O was analyzed in real time. During the separation of the two immiscible liquid phases, the droplets of water-rich phase underwent the movement of “precipitation → migration → coagulation → aggregation”, finally forming two layers of putamen nuclei with the water-rich phase as center. And the migration rate of Marangoni has been theoretically calculated, which can be in good agreement with each other.This proves that the second liquid phase is mainly driven by the temperature gradient in the phase separation of the meta-crystal solution Resulting in the migration of Marangoni.This experiment visually reproduces the phase separation inside the droplet during tubeless vessel removal.