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Главная Архив Thermal Letter Оргкомитет Будущие конференции AIHTC
International Heat Transfer Conference 16

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

AXSISYMMETRIC LATTICE BOLTZMANN METHOD FOR GAS-SOLID THERMOCHEMICAL REACTION IN PARTICLE SCALE

Zhenhai Pan
Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China

J. Yan
Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China

Changying Zhao
Research Center of New Energy and Energy Storage, China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 200240, China; Institute of Engineering Thermophysics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

DOI: 10.1615/IHTC16.ecs.022413
pages 4269-4278


Ключевые слова: Thermal storage, Numerical simulation and super-computing, Axisymmetric Lattice Boltzmann method, Thermochemical heat storage

Аннотация

Lattice Boltzmann method is an efficient numerical method for simulating fluid flow, heat transfer and chemical reaction in complex geometry. In recent years, axisymmetric Lattice Boltzmann method have been proposed to study axisymmetric problems with less computation resources. In this paper, we extended the axisymmetric Lattice Boltzmann method to study the heat discharging processes in thermochemical heat storage systems. An approach for treating transient fluid-solid conjugate heat transfer problems was proposed. This approach enables us to simulate the coupled chemical reaction and heat transfer processes in particle scale when a gas-solid reaction occurs. In a direct heat transfer MgO/Mg(OH)2 reactor, it is necessary to compact the powdered raw materials into pellets for stabilizing the characteristics of the reaction bed. Increasing the size of the pellets will affect the heat transfer and induce a change on the reaction time. Therefore, the reaction time for different pellet sizes was evaluated. The results show that the reaction time is dominated by the reaction rate coefficient when the pellet is small, and it is dominated by the heat transfer efficiency when the pellet is large.

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