Library Subscription: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

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

Get access (open in a dialog) DOI: 10.1615/IHTC16.ecs.022413
pages 4269-4278

Abstract

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.