Modelling of large-particle-motion–heat-transfer coupling characteristics in rotary kiln based on discrete element method
| Autor: | Hongbin Zheng, Dewang Zeng, Runjia Liu, Bing Wang, Rui Xiao |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Coupling
Materials science Large particle General Chemical Engineering Motion (geometry) 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Discrete element method law.invention 020401 chemical engineering law Heat transfer 0204 chemical engineering 0210 nano-technology Rotary kiln |
| Zdroj: | International Journal of Chemical Reactor Engineering. 18 |
| ISSN: | 1542-6580 2194-5748 |
| DOI: | 10.1515/ijcre-2020-0011 |
| Popis: | A three-dimensional numerical simulation of the motion – heat-transfer coupling characteristics of waste tyre particles in a rotary kiln at 773–973 K was performed in this study. The particle dynamics and heat transfer characteristics were solved on a Lagrange grid. The motion model considered particle collisions using a nonslip collision model. Based on the particle motion results obtained, we considered three heat transfer mechanisms: particle–particle collision heat conduction, wall–particle radiation heat transfer, and wall–particle collision heat conduction. Subsequently, we established a mathematical model wherein the heat transfer associated with a particle is determined by its position in each time step, and implemented it on a JAVA platform to perform calculations. Finally, we obtained the temperature of each particle at each moment in the entire process. Further analysis of the simulation results shows that the average temperature and temperature standard deviation is governed by the wall temperature, rotation speed, and particle size. |
| Databáze: | OpenAIRE |
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