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【期刊论文】Numerical simulation of tube erosion by particle impaction
樊建人, Jianren Fan, Dadong Zhou, Jun Jin and Kefa Cen
Wear, 142(1991)171-184,-0001,():
-1年11月30日
Erosion of tubes by coal particles or coal ash impingement has caused serious problems for many pulverized coal energy conversion systems. This type of erosion has led to many experimental investigations. This paper presents the numerical results of an investigation of coal particle dynamics about a tube. The calculation of particle trajectories takes into account the eftect of turbulence using a stochastic particle dispersion model. The results from this study include the frequency of particle impact and the erosion distribution on the tube surface. Good agreement is found between the numerical method and exoerhnent.
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【期刊论文】A Two-Dimensional Mathematical Model of Liquid-Feed Direct Methanol Fuel Cells
樊建人, J.R. Fan, * G.L. Hu, J. Yao, and K.F. Cen
Energy & Fuels 2002, 16, 1591-1598,-0001,():
-1年11月30日
A two-dimensional across-the-channel mathematical model for the simulation of a direct methanol fuel cell is described. The model accounts simultaneously for electrochemical kinetics, hydrodynamics, and multicomponent transport. The two-dimensional distributions of concentrations of reactants, the two-dimensional distributions of current densities, the crossover flux of methanol from the anode to the cathode, and current-voltage curve for the fuel cell have been calculated. The obtained results indicate that the concentrations of reactants in the catalyst layers in front of the current collectors are very low, which reduce the utility of catalyst; the current density at the edges of the channels is many times greater than the mean current density, which may lead to local overheat.
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【期刊论文】TURBULENT FLUID AND PARTICLE INTERACTION IN THE BOUNDARY LAYER FOR CROSS FLOW OVER A TUBE
樊建人, J.R. FAN, X.Y. ZHANG, J. JIN, Y.Q. ZHENG and K.F. CEN
Int. J. Multiphase Flow Vol. 24, No.2, pp. 213-223, 1998,-0001,():
-1年11月30日
The influence of solid particles on the flow characteristics of the boundary layer for cross flow over a tube has been experimentally studied. A phase-Doppler anemometer was used to measure the mean and fluctuation velocities of both phases. Two separate tests were conducted with two particle size ranges (30-60μm and 80-150μm) and the freestream velocity and solid mass loading ratio were fixed, allowing the effects of particle sizes on the shape of the mean velocity profile and on the turbulent intensity levels. The measureraents clearly demonstrated that the larger particles damped fluid turbulence. For the smaller particies, this damping effect was less noticeable. The measurements further showed a delay in the separation point for two phase turbulent cross flow over a tube.
particle and fluid turbulence interaction,, two-phase cross flow over a tube,, boundary layer,, PDA measurement
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【期刊论文】New stochastic particle dispersion modeling of a turbulent particle-laden round jet
樊建人, Jianren Fan*, Xinyu Zhang, Lihua Chen, Kefa Cen
Chemical Engineering Journal 66(1997)207-215,-0001,():
-1年11月30日
A modified model for particle-eddy interaction in two-phase turbulent flows is proposed to account for the turbulent dispersion of particles in a turbulent flow. In order to validate the proposed model, the structure of a turbulent, particle-laden, round jet, injected into a still environment, is studied both theoretically and experimentally. The numerical results show good agreement with the experimental data.
Stochastic model, Particle-laden jet, Particle dispersion, Numerical simulation, LDA measurement, LDM measurement
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【期刊论文】Numerical computation of particle-laden gas flows past staggered tube banks undergoing erosion
樊建人, Jianren Fan, Dadong Zhou, Qiang Hua, Kcfa Cen
Powder Technology 80(1994)1-10,-0001,():
-1年11月30日
Erosion of tubes in tube banks by particles suspended in gas flows is a major problem in the chemical and power industry. In this paper, a numerical study has been conducted for the flow of a dilute turbulent particle-laden gas moving past two rows of staggered tubes undergoing erosion. Eulerian equations are used to describe gas-pbase motion, with the turbulence viscosity evaluated from a k-c model of turbulence. The prediction of impacting particle velocities and trajectories takes into account the effect of the turbulence with a stochastic particle dispersion model, as described by the authors. The particle impaetion/rebound model and the erosion model of ductile alloys obtained by Tabakoff et al. are used to predict the particle rebound phenomena and the erosion damage to tile tubes. The results from this study include the distributions of particle collision frequency and erosion damage to tube surfaces. The locations of maximum erosion damage to the tubes are predicted. Results indicate that the erosion damage to the second row of tubes in staggered tube banks is approximately twice that of the first row of tubes. The present paper also discusses the effect of free stream velocity and particle size on particle collision frequency and erosion damage.
Erosion, Tube banks, Gas flow, Turbulence
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