期刊
POWDER TECHNOLOGY
卷 377, 期 -, 页码 607-620出版社
ELSEVIER
DOI: 10.1016/j.powtec.2020.09.021
关键词
Transient heat conduction; Contact thermal resistance; Pebble bed; Finite element; Discrete model; Continuum model
资金
- National Science and Technology Major Project [2011ZX06901-003]
- National Natural Science Foundation of China [51576211]
- National High Technology Research and Development Program of China (863) [2014AA052701]
DEFEM is a method that combines discrete-element and finite-element models for heat conduction, accurately simulating transient heat conduction in pebble beds. Comparative analysis between discrete-model and continuum-model shows their thermal responses and temperature distributions under the same conditions.
A DEM-embedded-finite-element-method (DEFEM) with a 2D-asymmetric circular particle heat conduction model is proposed. DEFEM combines the discrete-element (DE) and finite-element model (FEM) with heat conduction. With embedded discrete elements (EDE), DEFEM solves heat conduction between particles and temperature field inside particles. EDE solves heat conduction in asymmetric circular element, and FEM simulates transient heat conduction after the heat flux at boundaries is known. Verified by experiments, results show that DEFEM can accurately simulate transient heat conduction of pebble beds. Discrete-model (DM) and continuum-model (CM) are comparatively analyzed under the same thermal responses and temperature distributions. In CM, the standard function of thermal conductivity is fitted with an attenuation part, an increment part and a constant part. The constant part is defined as effective thermal conductivity (ETC) of CM, which is directly proportional to that of DM, and independent of heat capacity. Herein, ETC of the CM is a key parameter, which could be used to measure the overall heat transfer capability of the bed (C) 2020 Elsevier B.V. All rights reserved.
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