郭烈锦
能源转化与能源动力系统中的多相流热物理理论与技术;氢能规模制备与氢能源动力系统的理论与技术
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- 姓名:郭烈锦
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学术头衔:
博士生导师
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学科领域:
能源科学技术
- 研究兴趣:能源转化与能源动力系统中的多相流热物理理论与技术;氢能规模制备与氢能源动力系统的理论与技术
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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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郭烈锦, Lie-Jin Guo*, Zi-Ping Feng, Xue-jun Chen
International Journal of Heat and Mass Transfer 45(2002)533-542,-0001,():
-1年11月30日
Experiments for subcooled water flow and for steam-water two-phase flow were conducted to investigate the effects of pulsation upon transient heat transfer characteristics in a closed-circulation helical-coiled tube steam generator. The non-uniform property of local heat transfer with steady flow was examined. The secondary flow and the effect of interaction between the flow oscillation and secondary flow were analyzed on basis of the experimental data. Some new phenomena were observed and explained. Correlations were proposed for average and local heat transfer coefficients both under steady and oscillatory flow conditions. The results showed that there exist considerable variations in local and peripherally time-averaged Nusselt numbers for pulsating flow. Investigations of pressure drop type oscillations and their thresholds for steam-water two-phase flow in a uniformly heated helical tube were also reported.
Transient heat transfer, Pressure drop type oscillation, Heated helical tube
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郭烈锦, Liejin Guo*, Ziping Feng, Xuejun Chen
International Journal of Heat and Mass Transfer 44(2001)2601-2610,-0001,():
-1年11月30日
Fractional pressure drops of single-phase water and steam-water two-phase flows were studied in a pressure range of 3.0-3.5 Mpa. Two helical coiled tubes were employed as test sections and their four different helix axial inclinations were examined. It is found that helix axial angles have little influence on the single-phase Frictional pressure drop, while variation of the steam-water two-phase flow frictional pressure drop is enlarged to 70%. For single-phase flow, some previous correlations were quite accurate in predicting the frictional pressure drop for lower Reynolds number conditions, and a modified correlation was obtained from an enlarged Reynolds number range of the present test. For boiling two-phase flow, great deviation was found among the published few empirical equations and their capability of practical utilization is rather poor on account of their complication in structure. A new easily stipulated correlation is deducted from our present data.
Steam-water two-phase flow, Frictional pressure drop, Helical coiled tubes
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【期刊论文】Pressure drop oscillation of steam-water two-phase flow in a helically coiled tube
郭烈锦, Lie-Jin Guo*, Zi-Ping Feng, Xue-Jun Chen
International Journal of Heat and Mass Transfer 44(2001)1555-1564,-0001,():
-1年11月30日
Systematic investigations of pressure drop type oscillations and their thresholds were conducted for steam-water two-phase flow in a uniformly heated, helically coiled tube. Experiments were conducted to obtain the critical conditions for the occurrence of pressure drop type dynamic oscillation in a closed-circulation helically coiled tubing steam generator. The study showed that different locations of the tank which provided a compressible gas volume (called compressible volume for short) corresponded to different oscillation initial boundaries as well as different oscillating amplitudes and time periods. Moving compressible volume from the inlet of the steam generator upstream could dramatically suppress the occurrence of pressure drop oscillation. Also, non-uniform heat flux distribution along the evaporating channel could change oscillating boundaries significantly, especially when higher heat flux was applied to the higher mass quality region. A study of pressure drop oscillation in various steam generator inclinations showed that gravity has little influence upon the oscillating boundaries. Based on the experimental observations, a set of new methods was first proposed to eliminate the occurrence of pressure drop oscillation.
Pressure drop type oscillations, Steam-water two-phase flow, Closed-circulation helically coiled tubing steam generator
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郭烈锦, Xuejun Chen, Liejin Guo*
International Journal of Multiphase Flow 25(1999)1053-1072,-0001,():
-1年11月30日
Experimental investigations on oil-air-water three-phase flow were carried out in two helically coiled tubes with inner diameter of 39mm and coil diameters of 265 and 522.5mm, respectively. The purpose of this work is to provide a basis for the invention and development of a new kind of separation technology for gas-oil-water mixtures with low oil fraction β≤30%. The flow patterns of oil-water two-phase flow and oil-air-water three-phase flow were directly observed in test sections made of plexiglass tubes. The flows observed in coiled tubes could be classified into more than four flow patterns and some flow regime maps were generated and delineated for these tubes. The present results were compared with some results in horizontal flow. The phase inversion characteristics in helically coiled tubes were also discussed. The frictional pressure drop of oil-air-water three-phase flow were measured. The effects of flow rates and liquid properties on pressure drop were examined. Based on the experimental data and analysis of the flow mechanism the criteria for the flow pattern transition boundaries between two different flow patterns were proposed in terms of dimensionless parameters. Correlations for the predictions of pressure drop were also obtained.
Oil-air-water three-phase flows, Flow patterns, Frictional pressure drop, Helically coiled tube
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郭烈锦, Liejin Guo, * Xuejun Chen, Ziping Feng, Bofeng Bai
International Journal of Heat and Mass Transfer 41(1998)2867-2875,-0001,():
-1年11月30日
Experiments were conducted to investigate the effects of pulsation upon transient heat transfer characteristics for fully-developed turbulent flow in a uniformly heated helical coiled tube. The non-uniform feather of local heat transfer with steady flow was also examined. The secondary flow mechanism and the effect of interaction between the flow oscillation and secondary flow were analyzed on the basis of the experimental data. Some new phenomena were observed and explained. A series of correlations were proposed for the average and local heat transfer coefficients both under steady and oscillatory flow conditions. The results showed that there were considerable variations in local and peripherally timeaverage Nusselt numbers for pulsating flow in a wide range of parameters.
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