Journal
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
Volume 158, Issue -, Pages 4641-4647Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.egypro.2019.01.742
Keywords
Phase change material; Metal foam; Supergravity; Natural convection; Lattice Boltzmann method
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Funding
- State Key Program of National Natural Science of China [51536007]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51721004]
- Institute of Applied Electronics in China Academy of Engineering Physics
- Programme of Introducing Talents of Discipline to Universities Project [B16038]
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Latent thermal energy storage has been recommended as an effective technique to the thermal management system of space exploration due to its excellent ability of storing thermal energy. In the current work, the melting process of phase change material under supergravity conditions (3g, 5g, 7g) are numerically investigated by a pore-scale lattice Boltzmann method with the real microstructure of metal foam. A comparative study is carried out to illustrate the influence of gravitational acceleration and metal foam on melting performance of phase change material. Results indicate that natural convection accelerates the motion velocity of the upper PCM, and leads to the inhomogeneous distribution of melting front. Moreover, with the increasing gravitational acceleration, there is a transition of the dominated heat transfer mechanism from conduction to convection, which attributes to the stepped-up natural convection effect, and thus melting front gets even steeper and melting rate is significantly increased. Besides, the existence of metal foam significantly distorts the melting front and enhances the melting rate. (C) 2019 The Authors. Published by Elsevier Ltd.
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