Progress in Supercooling and Suppression Methods of Phase Change Materials

doi:10.11896/cldb.18100048

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	Progress in Supercooling and Suppression Methods of Phase Change Materials
	Zhang, Zhengfei 2; Qin, Ziyi 2; Li, Yong 2; Wang, Yi 1,2
刊名	Cailiao Daobao/Materials Reports
	2019-11-10
卷号	33 期号:11 页码:3613-3619
关键词	Additives Crystallization Diffusion in liquids Energy utilization Environmental regulations Fluidization Growth rate Heat storage Nanoparticles Nucleation Phase separation Polypropylenes Supercooling Ultrasonic effects Ultrasonic waves Vibrations (mechanical) Capsulation Functional fluids Nucleation theory Supercooling degrees Ultrasonic vibration
ISSN号	1005023X
DOI	10.11896/cldb.18100048
英文摘要	Supercooling is a metastable state produced in the process of liquid-solid phase transition to provide energy for ionic diffusion, crystal growth and crystal surface expansion. Although it is the driving force of crystallization, the excessive supercooling degree leads to the decrease of crystallization temperature and extension of crystallization time, which further makes the stored energy released in unsuited temperature and reduces the thermal energy utilization efficiency.The excessive supercooling degree has become one of the most important factors that restrict the large-scale application of phase change thermal storage technology. Numerous experimental results demonstrate that supercooling phenomenon is closely related to the formation and growth rate of melt crystal nucleus, environment temperature, roughness of contact surface, melt temperature, etc. Unfortunately, the intrinsic mechanism of the supercooling phenomenon is still problematic, and yet it is also necessary to experimentally explore the influence law and the regulation means. Currently, manual seeding including adding nucleating agents or nanoparticles, introducing additives before capsulation or fluidization, as well as dynamic nucleation including mechanical vibration, stirring and ultrasonic irradiation, are the most effective ways to induce crystallization. Heterogeneous nucleation induced by adding nucleating agents, nanoparticles and partially unmelted parent phase crystals is the most commonly used and effective method to eliminate supercooling. In order to improve the dispersibility of additives and prevent phase separation of hydrated inorganic salt, a certain amount of thickening agents is often required to be added apart from nucleating agent, but the addition amounts of the two need to be optimized. Capsulation can change the crystallization characteristics of phase change materials. Previous research has reached a consensus that dispersing nucleating agents prior to capsulation will improve the supercooling degree of phase change materials. Ultrasonic oscillation, the commonly used dynamic nucleation method, can accelerate the crystallization process and improve the dispersion of the crystal nucleus by breaking crystals and mixing with the melt. The addition of nanoparticles along with applying ultrasonic process are also conducive to suppressing supercooling. This paper briefly described the supercooling phenomenon and typical supercooling curves, as well as the factors influencing supercooling degree. In addition, it summarizes the methods of suppressing supercooling, including adding additives method, capsulation method, functional fluid method and ultrasonic vibration method. © 2019, Materials Review Magazine. All right reserved.
语种	中文
出版者	Cailiao Daobaoshe/ Materials Review
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/113954]
专题	石油化工学院
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China 2.College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Zhang, Zhengfei,Qin, Ziyi,Li, Yong,et al. Progress in Supercooling and Suppression Methods of Phase Change Materials[J]. Cailiao Daobao/Materials Reports,2019,33(11):3613-3619.
APA	Zhang, Zhengfei,Qin, Ziyi,Li, Yong,&Wang, Yi.(2019).Progress in Supercooling and Suppression Methods of Phase Change Materials.Cailiao Daobao/Materials Reports,33(11),3613-3619.
MLA	Zhang, Zhengfei,et al."Progress in Supercooling and Suppression Methods of Phase Change Materials".Cailiao Daobao/Materials Reports 33.11(2019):3613-3619.