期刊
ENERGY
卷 36, 期 9, 页码 5539-5546出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2011.07.019
关键词
Heat transfer enhancement; PCM; Metal foam; Thermal storage; Volume-averaged method; Non-thermal-equilibrium model
资金
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/F061439/1]
- National Natural Science Foundation of China [51071184]
- Engineering and Physical Sciences Research Council [EP/F061439/1] Funding Source: researchfish
- EPSRC [EP/F061439/1] Funding Source: UKRI
The effects of metal foams on heat transfer enhancement in Phase Change Materials (PCMs) are investigated. The numerical investigation is based on the two-equation non-equilibrium heat transfer model, in which the coupled heat conduction and natural convection are considered at phase transition and liquid zones. The numerical results are validated by experimental data. The main findings of the investigation are that heat conduction rate is increased significantly by using metal foams, due to their high thermal conductivities, and that natural convection is suppressed owing to the large flow resistance in metal foams. In spite of this suppression caused by metal foams, the overall heat transfer performance is improved when metal foams are embedded into PCM; this implies that the enhancement of heat conduction offsets or exceeds the natural convection loss. The results indicate that for different metal foam samples, heat transfer rate can be further increased by using metal foams with smaller porosities and bigger pore densities. (C) 2011 Elsevier Ltd. All rights reserved.
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