Journal
ENERGY
Volume 237, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.121540
Keywords
Metal foam; Varying pore density; Phase change material; Gradient design; Thermal energy storage performance
Categories
Funding
- National Natural Science Foun-dation of China [51806028, 51876027]
- Fundamental Research Funds for the Central Universities [DUT19JC09, DUT20JC21]
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By partially and gradient optimizing the pore densities of metal foams, the melting rate of metal foam composite phase change materials can be significantly enhanced, leading to an acceleration of the overall melting process.
To further enhance the melting rate of the metal foam composite phase change material (MFCPCM), we took partial and gradient optimizations on the pore densities of metal foams. The partially optimized models, including Partial-80-5-5 and Partial-5-5-80, were compared with the Uniform-5 model. Results show that the Partial-80-5-5 model has the most developed melting among the three models. It illustrates that enlarging the pore density in the top region is conducive to accelerating the whole melting process. Besides, through a further comparison of the Partial-80-5-5, Partial-40-5-5, and Partial-20-5-5 models, we concluded that the larger the pore-density in the top region is, the faster the melting is. Subsequently, the gradient optimizations, including Gradient-80-20-5 and Gradient-80-40-5 models, were experimented with and analyzed. It was obtained that the Gradient-80-40-5 model has the fastest melting rate among all models. The inhibition of the large pore density on natural convection at the top and middle regions causes a strong vortex at the bottom region, so the melting process is significantly reinforced. Through the optimizations on the metal foam's pore density, the energy storage rate can achieve a prominent enhancement. (c) 2021 Elsevier Ltd. All rights reserved.
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