Mixing and heat transfer of binary mixtures of monodispersed spherical particles with different densities and thermal diffusivities--颗粒学报PARTICUOLOGY

Wang, Q., & Liu, B. (2021). Mixing and heat transfer of binary mixtures of monodispersed spherical particles with different densities and thermal diffusivities. Particuology, 58, 118-130. https://doi.org/10.1016/j.partic.2021.01.015

Mixing and heat transfer of binary mixtures of monodispersed spherical particles with different densities and thermal diffusivities

Qing Wang ^*, Bowen Liu

Engineering Research Centre of Oil Shale Comprehensive Utilization, Ministry of Education, Northeast Electric Power University, Jilin 132012, China

10.1016/j.partic.2021.01.015

Volume 58, October 2021, Pages 118-130

Received 16 November 2020, Revised 23 January 2021, Accepted 26 January 2021, Available online 22 March 2021, Version of Record 20 April 2021.

E-mail: rlx888@126.com

Highlights

• Granular materials with different densities and thermal diffusivities were simulated.

• Interrelationship between mixing and heat transfer was investigated in a rotating drum.

• The effect of rotation speed on mixing and heat transfer characteristics was evaluated.

• A model considering contributions of different heat transfer mechanisms was employed.

Abstract

Mixing and heat transfer among particles in rotating drums are widely applied in numerous industrial processes. Generally, mixing and heat transfer occur simultaneously. Consequently, the interrelationship between mixing and heat transfer must be investigated for industrial applications. In this study, the radial mixing and heat transfer of spherical granular materials (3 mm) with various properties in batch rotating drums are investigated numerically using the discrete element method. The evolution of mixing and heat transfer characteristics with rotation speed is analyzed from the perspective of time and number of revolutions, respectively. The results indicate that, depending on the physical parameters and thermal properties of particles, the mixing quality does not always accurately reflect the heat transfer effect. In binary granular beds of monodispersed spherical particles with different densities and thermal diffusivities, the main heat transfer mechanism is related to the ratio of the thermal conductivity of the particles to that of the fluid.

Graphical abstract

Keywords

Rotating drums; Discrete element method; Mixing; Heat conduction; Heat radiation

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