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郭烈锦, H.Gao
Int. Comm. Heat Mass Transfer, Vol. 31, No. 2, pp. 161-168, 2004,-0001,():
-1年11月30日
A numerical investigation of the flow and heat transfer characteristics in a shuttle kiln is performed using the CFD software FLUENT with non-conformal grids and the standard κ-εturbulence model. The integral and local heat transfer non-uniformities of stacks are evaluated, and furthermore, the formation mechanism of such non-uniformities is analyzed. The results show much greater heat transfer intensity among the peripheral stacks than that among the internal ones, which contributes to the integral non-uniformity. The longitudinal heat transfer non-uniformity is primarily caused by the layer-like nozzle jets and bottom outlet, which form three layer-style surrounding streams converging to outlet. The periodical arrangement of stacks together with the strong impingement of jets, leads to the peripheral heat transfer non-uniformity. Based on the comprehensive understanding of flow and heat transfer, innovative efforts are made to improve heat transfer performance by adjusting flowrate distribution among nozzles.
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郭烈锦, X.H. Hao, L.J. Guo*, X. Mao, X.M. Zhang, X.J. Chen
International Journal of Hydrogen Energy 28(2003)55-64,-0001,():
-1年11月30日
Thermochemical gasification of biomass has been identified as a possible system for producing renewable hydrogen. A continuous tubular supercritical water gasification system is under development that can be used for solution or slurry materials gasification without drying. A unique feature of this system is its ability to realize the overall high-pressure continuous reaction by operating the valves. By the use of this system, designed for temperatures up to 923.15K and pressures up to 35MPa, glucose, as a model compound of biomass, was gasified in supercritical water at a series of temperature and pressure during different resident times to form a product gas composed of H2, CO, CH4, CO2, and a small amount of C2H4 and C2H6. Glucose at low concentrations (ca. 0.1M) can be completely gasified in 923.15K, 25MPa, and 3.6min resident time and no char or tar was observed. Consequently, we adopted these conditions as baseline reaction conditions for the following glucose concentration, alkali addition and reactor tube diameter effect studies. The raw biomass feedstock of sawdust with some CMC was also gasified in this system, the gasification efficiency in excess of 95% was reached.
Hydrogen production, Biomass, Supercritical water
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【期刊论文】Liquid-solid separation phenomena of two-phase turbulent flow in curved pipes
郭烈锦, Hui Gao, Liejin Guo*, Ximin Zhang
International Journal of Heat and Mass Transfer 45(2002)4995-5005,-0001,():
-1年11月30日
The present study is to contribute some knowledge of phase separation phenomena of liquid-solid two-phase turbulent flow in curved pipes and provide a basis for the invention and development of a new type of curved pipe separator. Firstly, the solid-liquid two-phase flows in two-dimensional (2D) curved channels were numerically simulated using a two-way coupling Euler-Lagrangian scheme. Phase distribution characteristics of 2D curved channel twophase flow were examined under conditions of different particle size, liquid flowrate and coil curvature. Based on the numerical results, the dynamic effects and contributions to phase separation of particle-subjected forces, including centrifugal force, drag force, pressure gradient force, gravity force, buoyancy force, virtual mass force and lift force, were exposed by kinematic and dynamic analysis alongparticle trajectories. Secondly, measurement of particle size and concentration profiles in helically coiled tube two-phase flow was conducted usinga nonintrusive Malvern 2600 particle sizer based on laser diffraction. Particle size and concentration distribution characteristics of helically coiled tube twophase flow and the effect of secondary flow on phase separation were analyzed based on experimental data.
Curved pipe, Phase separation, Turbulence, Liquid-solid two-phase flow, Numerical simulation
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郭烈锦, Lie-Jin Guo a, *, Guang-Jun Li a, Bin Chen a, Xue-Jun Chen a, D.D. Papailiou b, Th. Panidis b
Experimental Thermal and Fluid Science 26(2002)715-722,-0001,():
-1年11月30日
In the present paper, an experimental investigation of the humidifying and desulfuration of flue gas by water spraying is conducted in order to increase the ability of the self-desulfuration efficiency of Ca composition in coal in a power plant boiler. The experimental facility, nozzle structure, measurement method and instruments are introduced. The influence of nozzle structure, the way to enter the liquid and the ratio between phases on the spray characteristics including size distribution of the droplet and spray angle is studied. The results show significant variation and show how to optimize the design and operation of the nozzles.
Spray, Two-phase flow, Atomization effect of nozzles, Humidifying and desulfuration of flue gas
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郭烈锦, Lie-Jin Guo*, Guang-Jun Li, Xue-Jun Chen
International Journal of Heat and Mass Transfer 45(2002)1525-1534,-0001,():
-1年11月30日
A linear instability analysis was conducted firstly on the interface of a stratified gas-liquid two-phase flow in a circular piper employing a two-fluid model. The constitutive equations simulation technique was discussed, and the dispersive equation of interfacial waves was derived. The effects of flow rates of gas and liquid, liquid viscosity, surface tension and tube inclination on the stability of interface were investigated. A set of non-linear hyperbolic governing equations was deduced from the complete two-fluid model equation by omitting the effect of the surface tension and assuming a quasi-steady-state for the gas phase. Using characteristic line and finite difference, the propagation and growth of the interfacial disturbances were investigated in terms of gas and liquid superficial velocities. Then the results of the non-linear stability analysis were compared with those obtained by the linear stability analysis and experimental data. The non-linear stability analysis not only confirms the conclusions reached by the linear instability analysis, but also gives an insight into the growth and propagation of the interfacial disturbances on the interface of a gas-liquid two-phase flow.
Gas-liquid two-phase flow, Interfacial waves, Linear and non-linear stability analysis, Characteristic line, Numerical simulation
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