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Yongguang W.,Kelin Environmental Protection Equipment Inc | Yongguang W.,Jiangnan University | Zifeng N.,Jiangnan University | Guozhong C.,Kelin Environmental Protection Equipment Inc | And 3 more authors.
Science China Technological Sciences | Year: 2012

Finite element method (FEM) was used to investigate the effect of the number of layers on the bond strength for the brittle coating/substrate materials at contact load condition, which has not been addressed previously. The maximum shear stress was used to act as the criterion of the bonded strength. This paper discussed the relationship between the number of coating layers and the maximum shear stress of the layer/substrate interface. Firstly, the results of the FEM and the Hertz analytical method were compared to verify the accuracy of the FEM model. It was found that with the increase in the number of coating layers, the position of the suddenly changed stress along the z axis is transformed from the interface to the external surface of the coating. Finally, the increase in the number of layers contributes to the decrement of the stress along the x axis. © Science China Press and Springer-Verlag Berlin Heidelberg 2012.

Fang X.,Hunan University | Li S.,Hunan University | Li S.,Kelin Environmental Protection Equipment Inc. | Li C.,Hunan University | And 3 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

The gas-solid two phase flow through the bag filter fibers was numerically simulated by Lattice Boltzmann Method. The one-way coupled technique was used to describe the particles' movement behavior according to the Lagrange method. The results indicate that the variation of pressure drop conforms to the Darcy's law perfectly when gas flow passes through the porous media. The principles of the particulate (diameter≤1 μm) transportation and deposition on to the surfaces of the bag fiber were also discussed. The simulation results show that the collection efficiency varies with the particle diameter. When the particle diameter is less than 0.01 μm, the collection efficiency is quite high due to the strong Brownian diffusion effect. If the particle is greater than 0.1 μm, the collection efficiency goes up too, since the interception mechanism of the fiber plays an important role for the big size particles. However, it is relatively difficult to trap the particles in the range from 0.01 μm to 0.1 μm. The simulation is meaningful for the mechanism researches of bag-type dedust.

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