Li C.-K.,Shanghai Marine Diesel Engine Research Institute
Petrochemical Equipment | Year: 2013
Experimentations of air staging combustion have been carried out to investigate the influence rule of NOx emissions by changing the locations of staging air entered furnace, the air coefficients of primary air, the location and angle of waste water injection on acrylonitrile waste water incinerator test apparatus.
Yang J.,Xian Jiaotong University |
Bu S.,Xian Jiaotong University |
Dong Q.,Shanghai Marine Diesel Engine Research Institute |
Wu J.,Xian Jiaotong University |
Wang Q.,Xian Jiaotong University
Experimental Thermal and Fluid Science | Year: 2015
In the present study, the electrochemical technique is used to test flow transitions in random packed beds with five low tube to particle diameter ratios (N=dt/dp), including N=2.6, 5.3, 8.1, 9.9 and 12.5. The microelectrodes are placed at the tube wall and inner particle surfaces to test the local flow at the pore level, with particle Reynolds number (Re) ranging from 20 to 2200. The critical Reynolds numbers corresponding to the end of laminar flow and onset of turbulent flow are obtained according to Fluctuating Rate (FR) of current signals. The results of tube wall probes and inner probes are compared in detail to analyze the influences of the tube to particle diameter ratio N on flow transitions. It is found that, the critical Reynolds numbers corresponding to the end of laminar flow regime of packed beds with different tube to particle diameter ratios are at about 110 for packed beds with N=5.3, 8.1, 9.9 and 12.5. Meanwhile, as the tube to particle diameter ratio N increases, the onset of turbulence would take place earlier for inner probes in different packed beds. Furthermore, the critical Reynolds numbers corresponding to both the end of laminar flow and onset of turbulent flow in the packed bed with N=9.9 are quite close to those in the packed bed with N=12.5, which would indicate that, when N≥9.9, the wall effects on flow transitions in the packed beds would be unremarkable. © 2015 Elsevier Inc.
Han F.,Donghua University |
Wang Z.,Donghua University |
Du Y.,East China University of Science and Technology |
Sun X.,Beijing University of Posts and Telecommunications |
And 2 more authors.
International Journal of Non-Linear Mechanics | Year: 2015
Synchronized firing of bursting neurons has been found in many real neural systems. In this paper, a modified bursting Hodgkin-Huxley neuronal model is proposed and used to construct neuronal systems with heterogeneous neurons coupled by delayed chemical synapses, then synchronization of the systems is studied in various conditions. First, synchronization for a two-neuron system is explored. It is found that if the synapse is excitatory, the two neurons could achieve burst synchronization easily. If the synapse is inhibitory, they can achieve anti-phase burst synchronization, which is robust to variation of systematic parameters. Second, robust synchronization for a globally coupled neuronal network is investigated. It is found that the robustness of the synchronization is sensitive to the parameter values of synaptic conductance and synaptic delay, but is less sensitive to the parameter values of synaptic decay time. It is also found that the oscillation frequency of the whole network is sensitive to the parameter values of synaptic delay and synaptic decay time, but is less sensitive to the parameter value of synaptic conductance. © 2014 Elsevier Ltd All rights reserved.
Zhou W.J.,Xian Jiaotong University |
Luan H.B.,Shanghai Marine Diesel Engine Research Institute |
He Y.L.,Xian Jiaotong University |
Sun J.,CAS Institute of Engineering Thermophysics |
Tao W.Q.,Xian Jiaotong University
Microfluidics and Nanofluidics | Year: 2014
This paper presents an investigation of the non-periodic boundary condition (NPBC) which is often used in multiscale atomistic-continuum simulations. The relationship between the boundary force exerted by the imaginary atoms outside the atomistic domain and the fluid state parameters including density and temperature at the boundary is studied. A fitting formula of the boundary force as a function of the fluid state has been proposed based on the relationship. The accuracy of the fitting formula is verified by the equilibrium molecular dynamics (MD) simulations. Poiseuille flow with viscous dissipation and unsteady heat transfer between two walls is then simulated using the proposed fitting formula. The elimination of density oscillation near the boundary of atomistic region and good agreement of velocity and temperature evolutions with time from pure MD and the multiscale simulations adopting NPBC further confirm the correctness of our fitting formula. © 2013 Springer-Verlag Berlin Heidelberg.
Zhong Z.-J.,Shanghai Marine Diesel Engine Research Institute
Xiandai Huagong/Modern Chemical Industry | Year: 2012
In order to satisfy the anti-explosion and anti-polymerization requirement of process screw compressor for butadiene plant, the special design was made, which used two stages of dry compressors, improved shaft seals and modified the process design. In addition, it should pay much attention to the temperature control. The commissioning test results indicate that the unit can meet the process requirement. Moreover, the anti-explosion and anti-polymerization problems are solved well.