Zhang Y.,China University of Petroleum - Beijing |
Wang H.,Wuhuan Engineering Corporation |
Chen L.,China University of Petroleum - Beijing |
Lu C.,China University of Petroleum - Beijing
Industrial and Engineering Chemistry Research | Year: 2012
Particle segregation was systematically studied in a binary fluidized bed of inner diameter 0.286 m with fine FCC and coarse millet particles as flotsam and jetsam, respectively. Segregation efficiencies of both flotsam and jetsam, axial and radial fraction profiles were studied and analyzed systematically. A new developed horizontal baffle was examined to see its effects on particles segregation. Experimental results showed that the baffle-free bed could only get high-purity flotsam particles at very low gas velocities. However, both nearly pure jetsam and flotsam particles were obtainable at much higher gas velocities after four layers of new baffle are installed. A wider operating range suitable for particle segregation and greater axial fraction gradients were found in the baffled bed, further proving the baffle's effect on promoting particle segregation. This enables the baffled bed to be a promising continuous particle classifier in industry. Further analysis demonstrated that reduced bubble size, improve bubble flow distribution, and suppressed solid mixing are the intrinsic causes. © 2012 American Chemical Society.
Wang H.,Wuhan University of Technology |
Wu S.,Wuhan University of Technology |
Wang G.,Wuhuan Engineering Corporation
Journal of Testing and Evaluation | Year: 2012
The study is focused on the structural performance of conductive asphalt pavement embedded with exchanger tubes, using the finite element method. The pavement structure was modeled as a three-dimensional four-layer stratum using ABAQUS finite element suite. Viscoelastic response models of the asphalt concrete were properly established by using the Prony series. The developed response models were used in finite element simulations on the conductive asphalt pavement. The model of pavement embedded with different types of tubes was subjected to moving load. When the material stress or strain in the layer is computed, the design life can be predicted by using a fatigue model. Finally, the simulating method of the conductive asphalt pavement embedded with tubes was put forward and the study will provide road structural engineers with some design basis. Copyright © 2012 by ASTM International.
Wang H.,Wuhan University of Technology |
Wang G.,Wuhuan Engineering Corporation |
Wu S.,Wuhan University of Technology
Sustainable Construction Materials 2012 - Proceedings of the 2nd International Conference on Sustainable Construction Materials - Design, Performance, and Application | Year: 2013
The study is focused on the fatigue life prediction of Road System of Thermal Energy Collector and Release (RSTECR) using the finite element method. The pavement structure was modeled as two-dimensional, four-layer stratum using ANSYS finite element soft. The maximum tensile strain or stress of asphalt layers was calculated in order to predict the fatigue life of the system. Especially, the different load position and installed tube's direction were considered. The results show that no matter where the traffic direction is vertical or parallel to the installed tube's direction, the tube must not be installed in the top layer. The most adverse load position is that the single wheel is upon the installed tube when the load direction is parallel to traffic direction. And the most adverse load position is that two wheels are upon the installed tube when the load direction is vertical to traffic direction. Finally, the simulating method of the system was put forward and the study is expected to be able to provide road engineers with some design basis. © 2013 American Society of Civil Engineering.
Sun W.,Wuhan University |
He Y.-L.,Wuhan University |
Yuan S.,Wuhuan Engineering Corporation |
Xiong K.,Chang Jiang Survey Planning Design and Research LLC
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2014
Based on the collection, sortation, statistics and analysis of Hardfill material mechanics performance indexes, Monte-Carlo stochastic finite element method is adopted to study the static working behavior of Hardfill dam with considering the heterogeneity of material mechanical properties influence and the random field of the modulus of elasticity has been built. The results show that the displacement response is small and the amplitude of changes is not more than 13.7%, while the stress response is relatively greater and the amplitude of changes is not less than 18.8% and maximum reaches 110.5%. The mean responses of stress and deformation of dam are consistent with the homogeneous model. The variability of stress and deformation of the upstream and downstream, the top, the heel, and the toe of the dam is strong and the maximum variation coefficient reaches 0.21, while the internal part of the dam is not very prominent and the coefficient of variation is not more than 0.08. After the superposition with three times standard deviation, the rate of the displacement of the extreme points is not more than 5%, while the rate of the stress of the extreme points is not less than 18.4% and maximum reaches 375%.
Jin B.,Hunan University |
Jin B.,Wuhuan Engineering Corporation |
Huo J.,Hunan University
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2016
The variation of residual compressive strength of C30 calcareous aggregate concrete after elevated temperature was studied. Microscopic investigation on hardened cement paste(HCP) which had the same water to cement ratio and the same process methods of heating and cooling with the concrete, was conducted by thermogravimetric(TG) analysis, scanning electron microscopy(SEM) test and mercury intrusion porosimetry(MIP) test. The results indicate that the secondary hydration effect of HCP at medium and low temperatures(100300℃) has significant influence on the residual compressive strength of calcareous aggregate concrete at correspondent temperature interval. Meanwhile, the residual compressive strength of calcareous aggregate concrete has a good inverse correlation with the porosity of HCP after elevated temperature. © 2016, Editorial Department of Journal of Building Materials. All right reserved.