Research on Particle Characteristics of Cellulosine Used in Generation Basing on Two-Phase Flow of the Gas and Solid

The amount of remainder in wooden biomass resources available which was used for power generation in China was surveyed. Technique feasibility of the wooden remainder used in power generation was analyzed. A super fine cellulosine disintegrator for power generation was designed, which combined both characteristics of the wooden biomass and particle size of the cellulosine for power generation. The cellulosine particles which were obtained were put emphasis on analyzing and all kinds of stressed conditions were obtained during process of the grading under the environment for two-phase flow of the gas and solid. One kind of grading model of the cellulosine particles for power generation was established in view of all kinds of the influence factors comprehensively. One kind of calculation method for grading particle-diameter of the cellulosine particle, and the experiment results showed that this method was feasible.

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Investigations of Gas–Particle Two-Phase Flow in Swirling Combustor by the Particle Stokes Numbers

Processes ◽

10.3390/pr9060951 ◽

2021 ◽

Vol 9 (6) ◽

pp. 951

Author(s):

Yang Liu ◽

Guohui Li

Keyword(s):

Two Phase Flow ◽

Particle Diameter ◽

Tangential Direction ◽

Stokes Number ◽

Order Moment ◽

Frictional Stress ◽

Phase Flow ◽

Two Phase ◽

Close Relationship ◽

Experimental Validations

Gas turbulence modulations and particle dispersions of swirling gas–particle two-phase flow in the combustor is investigated under the large spans of the particle Stokes numbers. To fully consider the preferential concentrations and anisotropic dispersions of a particle, a kinetic frictional stress model coupled with a second-order moment two-phase turbulent model and granular temperature equation is improved. The proposed modeling and simulations are in good agreement with the experimental validations. Results show turbulent modulations and particle dispersions exhibit strongly anisotropic characteristics, keeping a close relationship with flow structure. The axial gas velocity and RMS fluctuation velocity of 45.0-μm EGP was approximately 5.0 times and 3.0 times greater than 1000.0 μm Copper particles, and their axial particle velocity was 0.25 times and twice greater than those of 45.0 μm EGP. The degree of modulation in the axial–radial direction is larger than those of radial–tangential and axial–tangential direction. Particle dispersions are sensitive to particle diameter parameters and intensified by higher Stokes number.

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Effects of particle size on two-phase flow loss in aluminized solid rocket motors

Acta Astronautica ◽

10.1016/j.actaastro.2019.03.022 ◽

2019 ◽

Vol 159 ◽

pp. 33-40 ◽

Cited By ~ 4

Author(s):

Ziyan Li ◽

Ningfei Wang ◽

Baolu Shi ◽

Shipeng Li ◽

Rongjie Yang

Keyword(s):

Particle Size ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Solid Rocket Motors ◽

Rocket Motors ◽

Flow Loss ◽

Solid Rocket

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Visualizing Test on the Distribution Rule of Coarse Particles in a Double Blade Pump

Volume 5: Multiphase Flow ◽

10.1115/ajkfluids2019-4622 ◽

2019 ◽

Author(s):

Xianfang Wu ◽

Xiao Tian ◽

Minggao Tan ◽

Houlin Liu

Keyword(s):

Particle Concentration ◽

Two Phase Flow ◽

Particle Density ◽

Particle Diameter ◽

Phase Flow ◽

Coarse Particles ◽

Two Phase ◽

Solid Liquid ◽

Blade Pump ◽

Flow Pump

Abstract As a typical fluid mechanics problem, pump blockage has always been a hot research topic. The obtaining of the distribution of coarse particles in the solid-liquid two-phase flow pump is the basis of improving its non-blocking performance. High-speed photography technique is applied to do visualizing test and research on the distribution of coarse particles in a double blade pump. The effects of particle concentration, particle density and particle diameter on the distribution of coarse particles in the solid-liquid two-phase flow pump at different phases are studied. Besides, the variation of hydraulic performance of the double blade pump under different parameters is also analyzed. The results show that the particles in the impeller mainly located in the vicinity of the blade pressure surface, and the distribution of the particles in each section of the volute is quite different. The great difference in particle density can result in obviously uneven distribution of particles. With the increase of particle diameter, particle density and particle concentration, the pump head and efficiency both decrease while the shaft power increase on the contrary. This research results can also provide a basis for the optimization design of solid-liquid two-phase flow pumps.

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Turbulence Structure of a Liquid-Solid Two-Phase Jet by Means of Laser Techniques

Volume 1: Fora, Parts A, B, C, and D ◽

10.1115/fedsm2003-45495 ◽

2003 ◽

Cited By ~ 3

Author(s):

Toshimichi Arai ◽

Naoki Kudo ◽

Tsuneaki Ishima ◽

Ismail M. Youssef ◽

Tomio Obokata ◽

...

Keyword(s):

Particle Size ◽

Single Phase ◽

Two Phase Flow ◽

Volume Ratio ◽

Water Phase ◽

Phase Flow ◽

Size Discrimination ◽

Single Phase Flow ◽

Particle Volume ◽

Two Phase

Characteristics on particle motion in a liquid-solid two-phase jet flow were studied in the paper. The water jet including glass particle of 389 μm in mean diameter was injected into water bath. The experimental conditions were 0.21% of initial particle volume ratio, 5mm in pipe diameter and 1.84 m/s of mean velocity on outlet of the jet. A laser Doppler anemometer (LDA) with size discrimination was applied for measuring the time serious velocities of the single-phase flow, particle and water phase flow. A particle image velocimetry (PIV) was also applied in the two-phase flow. The normal PIV method can hardly measure the particle size and perform the particle size discrimination. In the experiment, using the gray scales related with the scattering light intensity, measuring method with size discrimination in two-phase flow was carried out. The experimental results show less difference between velocities of single-phase flow and water-phase flow under this low particle volume ratio condition. Particles have the relative motion with the water-phase and large rms velocity. The PIV used in this experiment, which is called multi-intensity-layer-PIV: MILP, can measure water-phase velocity with good accuracy.

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Particle Behaviors Under Acceleration Condition in Solid-Air Two Phase Flow

18th International Conference on Nuclear Engineering: Volume 2 ◽

10.1115/icone18-30347 ◽

2010 ◽

Author(s):

Tong Zhao ◽

Masahiro Takei

Keyword(s):

Particle Size ◽

Particle Acceleration ◽

Loading Condition ◽

Two Phase Flow ◽

Numerical Study ◽

Phase Flow ◽

Particle Loading ◽

Initial Particle ◽

Two Phase ◽

Calculation Region

This paper presents a numerical study of the particle behaviors under acceleration conditions in the solid-air two-phase flow by means of a combined two-dimensional model of computational fluid dynamics and discrete element method (CFD-DEM). The simulation model provides the information regarding the particle distribution behaviors within the calculation region and the particle run-out rate from the calculation region under different parameter conditions, such as particle size, initial particle loading and particle acceleration condition. The results demonstrate that the particle run-out rate is directly influenced by the particle size and the initial loading condition. The particle acceleration in the horizontal direction adversely affects the particle run-out rate when the initial particle loading condition is dispersed and uniform. However, this adverse effect disappears when the initial particle loading condition becomes concentrate and partial.

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