Numerical investigation of transient gas–solid heat transfer in a packed bed: Impact of intra-particle thermal diffusion--颗粒学报PARTICUOLOGY

Che, H., Yue, Y., Jiang, Z., & Li, D. (2024). Numerical investigation of transient gas–solid heat transfer in a packed bed: Impact of intra-particle thermal diffusion. Particuology, 90, 404-411. https://doi.org/10.1016/j.partic.2024.01.007

Numerical investigation of transient gas–solid heat transfer in a packed bed: Impact of intra-particle thermal diffusion

Hanqiao Che^{a b *}, Yuanhe Yue ^{c d *}, Zhaohua Jiang^e, Duan Li^f

a School of Mechanical Engineering, Guangxi University, Nanning, Guangxi, 530004, China
b School of Chemical Engineering, University of Birmingham, Birmingham, B15 2TT, UK
c Hebei Engineering Research Center of Advanced Energy Storage Technology and Equipment, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
d Hebei Key Laboratory of Thermal Science and Energy Clean Utilization, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
e School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
f School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China

10.1016/j.partic.2024.01.007

Volume 90, July 2024, Pages 404-411

Received 12 September 2023, Revised 1 January 2024, Accepted 15 January 2024, Available online 21 January 2024, Version of Record 10 February 2024.

E-mail: chehanqiao@gxu.edu.cn; yuanhe.yue@hebut.edu.cn

Highlights

• Transient heat transfer behaviours in a packed bed are studied by computational fluid dynamics and discrete element method.

• Impact of intraparticle thermal diffusion is emphasized.

• In the packed bed's warming phase, the highest heat flow shifts upward.

• Heat transfer is more sensitive to particle size than thermal diffusivity.

Abstract

The transient heat transfer behaviours in a packed bed have been studied using coupled computational fluid dynamics (CFD) and discrete element method (DEM). Intra-particle thermal diffusion, which is a crucial but rarely explored issue, is considered by introducing a one-dimensional diffusion equation in the DEM solver. To achieve a sufficiently long physical time of simulations, we further reduce the computational cost by applying periodic boundary condition to a small segment of the packed bed. Our study demonstrates a shifting peak heat flow rate from the bottom to the top of the packed bed during the initial warming phase. We affirm that the influence of thermal diffusion within a particle is noteworthy only for particles exhibiting a high Biot number (e.g., Bi = 1.2). This insight enriches our understanding of heat transfer mechanisms in packed beds and their practical engineering applications.

Graphical abstract

Keywords

Packed bed; Intra-particle heat transfer; CFD–DEM

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