NUMERICAL SIMULATION OF HEAT TRANSFER CHARACTERISTICS OF AIR-SAND MOVING BED BASED ON LBM-DEM

Zhang Jian; Li Bin; Yang Yuang; Wu Zhengren; Wang Xin; Li Xinfu

doi:10.19912/j.0254-0096.tynxb.2024-0685

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (8) : 555-563. DOI: 10.19912/j.0254-0096.tynxb.2024-0685

NUMERICAL SIMULATION OF HEAT TRANSFER CHARACTERISTICS OF AIR-SAND MOVING BED BASED ON LBM-DEM

Zhang Jian, Li Bin, Yang Yuang, Wu Zhengren, Wang Xin, Li Xinfu

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Abstract

This study systematically examines the dense gas-solid two-phase flow behavior and conjugate heat transfer characteristics in an air-sand moving bed heat exchanger for tower-type solar thermal power generation systems. A mesoscopic-scale coupled lattice Boltzmann method-discrete element method （LBM-DEM） framework is developed to characterize particle-fluid hydrodynamic interactions and associated thermal transport phenomena under high solid-phase volume fraction conditions. Numerical simulations of heat transfer in the air-sand moving bed were conducted with different mass flow ratios of the air and sand. The paper studies the changes in the temperature fields of both the gas and solid phases and compares the proportions and the trends of different heat transfer modes throughout the process. The results indicate that the dense sand which hinders heat transfer along the airflow direction significantly affects the gas phase temperature field. After a period of heating, the gas temperature distribution in the bed stabilizes with a diagonal temperature gradient. It conforms to the characteristics of staggered-flow heat transfer in air-sand moving beds. The simulation reveals a significant variation in temperature changes of sands at different positions in the bed. At the initial stage, only the sand on the left side of the bed is heated. After the temperature field stabilized, the temperature gradient of sand along the direction of airflow incidence is substantial. The main mode of heat transfer in the air-sand moving bed is convective tranfer rate. At a heating air temperature of 500 ℃, the convective tranfer rate accounts for 98.50% of the total heat transfer. The radiation tranfer rate and conduction tranfer rate are positively correlated with the incident air velocity. The air-sand flow ratio is negatively correlated with the gas phase efficiency, but positively correlated with the solid phase efficiency. In addition, the air-sand flow ratio is positively correlated with the exergy efficiency.

Key words

solar thermal power generation / two phase flow / heat transfer performance / numerical simulation / moving bed heat exchanger / LBM-DEM method

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Zhang Jian, Li Bin, Yang Yuang, Wu Zhengren, Wang Xin, Li Xinfu. NUMERICAL SIMULATION OF HEAT TRANSFER CHARACTERISTICS OF AIR-SAND MOVING BED BASED ON LBM-DEM[J]. Acta Energiae Solaris Sinica. 2025, 46(8): 555-563 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0685

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