2026-10-14T11:31:09Z https://www.scidb.cn/oai

10.57760/sciencedb.04265 2022-10-26T11:17:14Z

2022-10-26 A DEM-based heat transfer model for the evaluation of effective thermal conductivity of packed beds filled with stagnant fluid: Thermal contact theory and numerical simulation doi:10.57760/sciencedb.04265 en The Effective thermal conductivity (keff) is one of the key thermal properties for packed beds in the presence of a stagnant fluid. In this study, a thermal discrete element model (DEM) based on the original Cheng-Yu-Zulli analytical model for mono-sized packed beds has been improved and implemented especially for mixed beds of different particle sizes or materials. In order to perform the DEM simulation for packed beds, a thermal contact theory considering three heat transfer mechanisms (solid contact conduction, solid-fluid-solid conduction and radiation) was derived and applied in the network of Voronoi cells obtained by radical Voronoi tessellation of the relevant beds. The numerical model was validated through a comparison with experimental results already reported in literature and a good prediction for the effective thermal conductivity was obtained for both mono-sized and multi sized packed beds in a wide range of solid-to-fluid conductivity ratio. The model also showed a good performance to study the heat flow distribution as well as the coupled thermo-mechanical behavior of packed beds. Fluid-filled packed bed; Effective thermal conductivity; Discrete element method; Thermal contact theory; Radical Voronoi tessellation Lei CHEN Cong Wang Marigrazia Moscardini Marc Kamlah Songlin Liu PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset Science Data Bank