scholarly journals Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge 2 Sb 2 Te 5

2019 ◽  
Vol 31 (39) ◽  
pp. 1900784 ◽  
Author(s):  
Julian Pries ◽  
Shuai Wei ◽  
Matthias Wuttig ◽  
Pierre Lucas
Keyword(s):  
Liquid Phase ◽  
Phase Change ◽  
Phase Change Material ◽  
Undercooled Liquid ◽  
Change Material

scholarly journals The additional heat flux due to adhesion at a partially immersed rotating drum heat exchanger for latent heat storage

2021 ◽  
Vol 2116 (1) ◽  
pp. 012097
Author(s):  
J Tombrink ◽  
E Jung ◽  
D Bauer
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Exchanger ◽  
Liquid Phase ◽  
Phase Change ◽  
Layer Thickness ◽  
Phase Change Material ◽  
Rotating Drum ◽  
Additional Heat ◽  
Change Material

Abstract Latent heat storages can be used to store thermal energy at a constant temperature. By actively removing the solidified phase change material from the heat exchanger surface during the discharge process, the heat flux can be kept constant and a separation of power and capacity is possible. In the presented rotating drum concept, a cooled drum is partially immersed in a tub of liquid phase change material and rotates in it. Phase change material solidifies at the submerged part of the drum. In addition, adhering liquid phase change material solidifies after the surface has left the tub. In this paper, the additional heat transfer due to adhesion is examined by determining the solidified layer thickness as well as the heat transfer by comparing measurements with adhesion and while eliminating the adhesion with a rubber lip. The measured adhering layer thickness differs by 33% from a presented analytical approach. The transferred heat is increased up to 26 % due to the adhesion.

Prediction of Bulk Density of Microencapsuated Phase Change Material Slurry

2008 ◽  
Author(s):  
Chuanshan Dai ◽  
Huajun Wang ◽  
Liang Zhang
Keyword(s):  
Liquid Phase ◽  
Phase Change ◽  
Bulk Density ◽  
Phase Change Material ◽  
Thermal Capacity ◽  
Fabrication Technology ◽  
Solid Liquid ◽  
Change Material ◽  
Particle Geometry ◽  
Changing Process

The use of phase change material (PCM) particles suspended in a liquid-phase carrying fluid can provide additional thermal capacity from the latent heat associated with the solid-liquid phase changing process. It has the advantages of capable flowing and simultaneously a high effective heat capacity in a certain temperature range. However, the bulk thermophysical properties are very specific and may vary with many parameters such as particle geometry, chemical component, fabrication technology and temperature. This paper proposed a theoretical model for predicting the bulk density of microencapsulated PCM slurry in solid-liquid phase changing process basing on a thermodynamic analysis of free energy and Gibbs-Thomson theory. The effects of particle size and distribution, mass concentration and surface tension of PCM on the bulk slurry density were investigated.

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