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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

PORE-SCALE NUMERICAL SIMULATION OF MELTING PROCESS OF PCMS IN FOAM METALS

Gaosheng Wei
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China

Gang Wang
The Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China

Yanping Yang
The Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China

Chao Xu
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, China

Xiaoze Du
North China Electric Power University

DOI: 10.1615/IHTC16.hte.022355
pages 4979-4984


PALABRAS CLAVE: Thermal storage, Porous media, metal foam, PCM, energy storage, melting, heat transfer enhancement

Sinopsis

Different foam metals combined with paraffin and other materials were analyzed to determine the melting process of the composite materials. A W-P model composed of six tetrakaidecahedrons and two irregular dodecahedrons was used in the simulation in open foam metal at pore-scale under constant temperature. The results show that the microstructure of the foam metal had an obvious effect on the solid-liquid phase distribution during the PCM melting process, where the heat was transferred mainly through the melted liquid PCM field. Conduction was the dominant heat transfer mechanism, and natural convection in the liquid PCM was weak for the confinement of foam metals. For heat transfer during the PCM melting process, conduction through the skeleton of the porous metal played the most important role. The PCM adjacent to the heating source and foam metal frame melted first, with the fusion zone gradually spreading to the pore center. The melting rate of the PCM increased with increasing boundary temperature and thermal conductivity of the foam metal, but decreased as foam metal porosity increased. During the melting process, the liquid phase fraction did not linearly grow with time; the melting rate was very large at the initial stage, but decreased gradually with time.

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