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13 results on '"Suo, Shaoyi"'

7. Application of CFD-DSMC coupling method in H2 flow and heat transfer in microtube.

Author

Jiang, Linsong, Yu, Huanli, Zhang, Shuo, Zhang, Yang, Qi, Haotian, Suo, Shaoyi, and Xie, Maozhao

Subjects
HEAT transfer, POROUS materials, HEAT transfer fluids, TEMPERATURE distribution, GAS flow
Abstract

In the research of porous media and the interior of microelectronic devices, fluids frequently shuttle among pores and wall cracks, therefore it is of great significance to explore the influence of media wall on fluid flow and heat transfer. In this paper, CFD-DSMC coupled iterative algorithm is first used in the research of the flow and heat transfer of gas near the wall in the porous media, which simplified into the flow and heat transfer in micron-scale tube with smooth and rough wall conditions. It is found that compared with the pure CFD method, the velocity field obtained by the coupled method is quite different in the region close to the wall, and this will affect the flow field in the mainstream region, that is, with the higher roughness of the wall, the velocity in the central region will be smaller. There is no significant difference in the temperature distribution in the microtube before and after coupling, but the temperature in the mainstream decreases with the increase of the roughness of the wall. In addition, the temperature jump was found from some of the coupling results close to the wall. The results will contribute to a deeper understanding of the influence of rough surfaces on gas flow and heat transfer near the wall, and provide guidance for the regulation of flow and heat transfer in porous media. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Pore-scale study of flame propagation and thermal characteristics in randomly packed beds

Author

Suo Shaoyi, Wang Ping, and Jiang Linsong

Subjects
Materials science, Turbulence, 020209 energy, Energy Engineering and Power Technology, 02 engineering and technology, Mechanics, Combustion, Industrial and Manufacturing Engineering, law.invention, Physics::Fluid Dynamics, Ignition system, Temperature gradient, 020401 chemical engineering, law, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Physics::Chemical Physics, 0204 chemical engineering, Porosity, Porous medium, Geometric modeling
Abstract

The discrete element software LIGGGHTS is applied to reproduce the packing process of pellets under gravity. A 3-D geometric model is obtained which is similar to the actual packed structure. Based on the 3-D geometric model, a Large-eddy simulation (LES) method combined with the power-law flame wrinkling model is utilized to simulate the hydrogen-air premixed combustion in enclosed space. In addition, the validity of the model is verified by comparing the simulation results with the experimental data. It shows that the expansion velocity of high-temperature region in the porous structure is higher than that in the non-porous structure. At the initial ignition stage, as the difference of temperature is too large, the temperature transition zone can be widened effectively by the porous media structure, and the temperature gradient is reduced leading to a more uniform temperature field. According to the distribution of Karlovitz number on the flame surface, the quantitative analysis of turbulence-flame interaction in the porous structures is carried out, and the zoning law of turbulent flame under various operating conditions is established.

Published
2020

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