辛烷相变微胶囊微观熔化实验观测  

MICROSCOPIC OBSERVATION OF MELTING PROCESS OF OCTANE WITH/WITHOUT ENCAPSULATION

作　　者：王燕[1] 陈振乾[1,2] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]东南大学城市工程科学国际研究中心,南京210096

出　　处：《太阳能学报》2014年第8期1499-1504,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50676020);国家重点基础研究发展(973)计划(2006CB300404)

摘　　要：分别采用差示扫描量热仪和冷热台对纯辛烷以及辛烷微胶囊进行熔化实验,显微镜用来观测加热/冷却过程中相变物质的相行为。结果表明自由界面的存在能有效降低熔化势垒,而快速加热具有相反的作用,即导致一定程度的过热,遵循经典相变理论。界面的存在和受限空间对相变的特性会有一定程度的影响。提供了辛烷的冷凝过程,用来和熔化过程进行比较,结果发现二者的相变点并不完全一致。The melting processes of pure octane and micro encapsulated octane were studied by differential scanning calorimeter and heating/cooling stage separately, and microscope was used to observe the whole process continuously. The results showed that the free surface can reduce the melting barrier effectively and fast heating will induce overheating, obeying to the classic melting theory. Solidification process was also provided to make a comparison to study the kinetic and thermodynamics properties of phase change.

关 键 词：自由 受限相变 熔化实验 显微镜观测 相变机理 

分 类 号：TK121[动力工程及工程热物理—工程热物理]