Key Laboratory of Tobacco Processing Technology

Zhengzhou, China

Key Laboratory of Tobacco Processing Technology

Zhengzhou, China

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Zhu L.,Nanjing Southeast University | Zhu L.,Key Laboratory of Tobacco Processing Technology | Yuan Z.,Nanjing Southeast University | Yan Y.,Key Laboratory of Tobacco Processing Technology | And 3 more authors.
Huagong Xuebao/CIESC Journal | Year: 2013

The knowledge on the heat and mass transfer characteristics of filamentous particles in a fixed bed is preliminary. This paper describes a numerical model for microscopic heat and mass transfer mechanisms between particles and between gas and particles at particle scale. The CFD-DEM coupled approach was employed to numerical study on the local flow and transfer information in the fixed bed, which is difficult to obtain from experiment. The critical factors influencing the temperature and moisture content distribution in a fixed bed such as the air inlet temperature and superficial gas velocity were examined. The model was validated by comparing the simulation results with experimental data. It is concluded that the temperature of filamentous particles reduces and the moisture content of particles increases with the increase of bed height. The air inlet temperature plays a dominant role in the average temperature of the bed, and the mass transfer rate of filamentous particles is affected more obviously by the superficial gas velocity. © All Rights Reserved.


Zhu L.,Nanjing Southeast University | Zhu L.,Key Laboratory of Tobacco Processing Technology | Yuan Z.,Nanjing Southeast University | Yan Y.,Key Laboratory of Tobacco Processing Technology | And 3 more authors.
Huagong Xuebao/CIESC Journal | Year: 2012

Filamentous particle is a kind of non-spherical particles with large aspect ratio. It has been widely applied in industrial and agricultural processes. However, the heat transfer phenomenon about particles is not well understood, especially the filamentous particle. In this study, in order to describe the heat transfer process of filamentous particle, a new mathematical model based on the discrete element method was proposed through the analysis of heat transfer mechanisms. The impact heat transfer between particles, the internal heat conduction and the convection heat exchange between gas and particles were considered in this model, and then it was used to numerically study the heat transfer process of filamentous particles in a fixed bed. Comparing the mechanisms with each other, it showed that the convection heat exchange had greater contribution to the total heat transfer. In addition, the simulation results revealed some internal temperature rules in filamentous particles under different operating conditions. © 2012 All Rights Reserved.


Zhu L.,Nanjing Southeast University | Zhu L.,Key Laboratory of Tobacco Processing Technology | Peng X.,Nanjing Southeast University | Huang F.,Nanjing Southeast University | And 5 more authors.
Huagong Xuebao/CIESC Journal | Year: 2012

Due to the problem in available numerical simulations of flow patterns in dense pneumatic conveying, a new mathematical model, which uses solid-phase volume concentration of local space and kinematic characteristics of clusters to describe the interactions between particles, was proposed in this paper. This model was first used to numerically simulate the dense pneumatic conveying (even for the packing of particles), and then used to numerically study the flow behavior of dense phase pneumatic conveying in horizontal pipe at high pressures, in which the separation and sedimentation between gas phase and solid phase in the conveying process were investigated. The simulation results also illustrated the evolving characteristics of flow patterns such as dune flow and plug flow, which are consistent with the experimental phenomena. Moreover, some rules of flow patterns were revealed by qualitatively analyzing the distribution of solid-phase flow patterns at different superficial gas velocities. The results show that the new model is appropriate and can be used to study the dense pneumatic conveying. © All Rights Reserved.

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