Thermal performance of bare and finned tubes submersed in nano-PCM mixture

Phase change materials (PCMs) are well accepted as excellent candidates for thermal energy storage and many other important applications. One of their main drawbacks is the poor thermal conductivity which impairs their thermal performance. Many methods were proposed to solve this problem among which...

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Bibliographic Details
Published in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2021, Vol.43 (1), Article 16
Main Authors: Nóbrega, Cláudia R. E. S., Ismail, Kamal A. R., Lino, Fátima A. M.
Format: Article
Language:English
Subjects:
Aluminum oxide
Energy storage
Engineering
Fins
Mechanical Engineering
Nanoparticles
Nanoparticles and Passive-Enhancement Methods in Energy
Numerical prediction
Phase change materials
Solidification
Technical Paper
Thermal conductivity
Thermal energy
Tubes
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Summary:Phase change materials (PCMs) are well accepted as excellent candidates for thermal energy storage and many other important applications. One of their main drawbacks is the poor thermal conductivity which impairs their thermal performance. Many methods were proposed to solve this problem among which fins and nano-PCMs occupy leading positions in terms of efficiency and reliability. In this paper a homebuilt numerical code is used to calculate and compare the numerical predictions of finned and finless tubes submersed in PCM and nano-PCM. For both finned and finless tubes it is found that the increase in the nanoparticles fraction increases the interface position and the interface velocity and decreases the time for complete phase change. For the case of finless tube the addition of 10% of Al 2 O 3 nanoparticles to the PCM and comparing the results with the case of finless tube in pure PCM are found to increase the interface position by 25%. On the other hand, the addition of 10% Al 2 O 3 nanoparticles to the four fins tube and comparing the results with the case finless tube in pure PCM are found to reduce the complete solidification time by 9.1%.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-020-02740-5