Numerical Study on Heat Transfer Performance in Packed Bed

Shicheng Wang, Chenyi Xu, Wei Liu and Zhichun Liu
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Shicheng Wang: School of Energy and Power engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Chenyi Xu: School of Energy and Power engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Wei Liu: School of Energy and Power engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Zhichun Liu: School of Energy and Power engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2019, vol. 12, issue 3, 1-22

Abstract: Packed beds are widely used in industries and it is of great significance to enhance the heat transfer between gas and solid states inside the bed. In this paper, numerical simulation method is adopted to investigate the heat transfer principle in the bed at particle scale, and to develop the direct enhanced heat transfer methods in packed beds. The gas is treated as continuous phase and solved by Computational Fluid Dynamics (CFD), while the particles are treated as discrete phase and solved by the Discrete Element Method (DEM); taking entransy dissipation to evaluate the heat transfer process. Considering the overall performance and entransy dissipation, the results show that, compared with the uniform particle size distribution, radial distribution of multiparticle size can effectively improve the heat transfer performance because it optimizes the velocity and temperature field, reduces the equivalent thermal resistance of convection heat transfer process, and the temperature of outlet gas increases significantly, which indicates the heat quality of the gas has been greatly improved. The increase in distribution thickness obviously enhances heat transfer performance without reducing the equivalent thermal resistance in the bed. The result is of great importance for guiding practical engineering applications.

Keywords: Discrete Element Model; gas–solid flow; heat transfer enhancement; entransy dissipation; numerical simulation; optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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