Numerical Simulation of the Two-Phase Flow in a New Type Cyclone

2011 ◽  
Vol 201-203 ◽  
pp. 263-266 ◽  
Author(s):  
Ning Ning Xing ◽  
Wei Lin Zhao
Keyword(s):  
Numerical Simulation ◽  
Gas Flow ◽  
Particle Trajectory ◽  
Swirling Flow ◽  
Flow Characteristics ◽  
Cement Plant ◽  
Phase Flow ◽  
Two Phase ◽  
New Type ◽  
Fluent Software

A new type cyclone with oblique top, transitional volute chamber, eccentric inner cylinders and sloping outlet were designed and manufactured by numerical analysis, which had been applied to the five-stage preheater in the cement plant with the capacity of 5000t/d. To simulate the gas flow field and particle trajectory in cyclone, the Fluent software was used, and the RNG k-ε model and discrete random walk model were proposed. The flow characteristics of gas-solid two-phase were analyzed. It is found that the strongly swirling flow occurs in the new type cyclone, and the particles of raw meal can be more efficiently separated from the gas.

The Effect of Inner Cylinder on Cyclone Preheater Using Fluent Software

2014 ◽  
Vol 1030-1032 ◽  
pp. 1352-1355
Author(s):  
Li Long Dong ◽  
Wei Lin Zhao ◽  
Jian Rong Wang ◽  
Zong Jun Geng
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Turbulence Model ◽  
Pressure Loss ◽  
Gas Flow ◽  
Particle Trajectory ◽  
Cement Plant ◽  
Thermal Data ◽  
Fluent Software ◽  
Simulation Results

The paper presented the gas flow field and particle trajectory with a series of inner cylinders in cyclone preheater using RNG k-ε turbulence model and stochastic trajectory model on the platform of Fluent software. The separability and pressure loss of cyclone preheater were investigated. The result shows the ratio of d/D and h/H of cyclone preheater was advised 0.50 to 0.65 and 0.35 to 0.60 respectively. It is also found that the numerical simulation results are in agreement with the thermal data of cement plant.

Experimental, Numerical, and Statistical Investigation of Two Phase Flow in a Cylindrical Perforation Tunnel

2021 ◽  
Author(s):  
Ekhwaiter Abobaker ◽  
Abadelhalim Elsanoose ◽  
Mohammad Azizur Rahman ◽  
Faisal Khan ◽  
Amer Aborig ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Steady State ◽  
Statistical Analysis ◽  
Flow Rate ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Gas Flow Rate ◽  
Two Phase ◽  
Flow Through

Abstract Perforation is the final stage in well completion that helps to connect reservoir formations to wellbores during hydrocarbon production. The drilling perforation technique maximizes the reservoir productivity index by minimizing damage. This can be best accomplished by attaining a better understanding of fluid flows that occur in the near-wellbore region during oil and gas operations. The present work aims to enhance oil recovery by modelling a two-phase flow through the near-wellbore region, thereby expanding industry knowledge about well performance. An experimental procedure was conducted to investigate the behavior of two-phase flow through a cylindrical perforation tunnel. Statistical analysis was coupled with numerical simulation to expand the investigation of fluid flow in the near-wellbore region that cannot be obtained experimentally. The statistical analysis investigated the effect of several parameters, including the liquid and gas flow rate, liquid viscosity, permeability, and porosity, on the injection build-up pressure and the time needed to reach a steady-state flow condition. Design-Expert® Design of Experiments (DoE) software was used to determine the numerical simulation runs using the ANOVA analysis with a Box-Behnken Design (BBD) model and ANSYS-FLUENT was used to analyses the numerical simulation of the porous media tunnel by applying the volume of fluid method (VOF). The experimental data were validated to the numerical results, and the comparison of results was in good agreement. The numerical and statistical analysis demonstrated each investigated parameter’s effect. The permeability, flow rate, and viscosity of the liquid significantly affect the injection pressure build-up profile, and porosity and gas flow rate substantially affect the time required to attain steady-state conditions. In addition, two correlations obtained from the statistical analysis can be used to predict the injection build-up pressure and the required time to reach steady state for different scenarios. This work will contribute to the clarification and understanding of the behavior of multiphase flow in the near-wellbore region.

Numerical Simulation and Experimental Validation on the Particle Trajectory in a Solid Propellant Rocket Chamber

2000 ◽  
Author(s):  
Yumin Xiao ◽  
R. S. Amano ◽  
Timin Cai ◽  
Jiang Li
Keyword(s):  
Numerical Simulation ◽  
Experimental Method ◽  
High Speed ◽  
Particle Trajectory ◽  
Two Phase Flow ◽  
Measurement Data ◽  
Special Method ◽  
Phase Flow ◽  
Two Phase ◽  
Particle Injection

Abstract In solid rocket motors (SRMS) using aluminized composite solid propellants and submerged nozzles a two-phase flow pattern is one of the main flow characteristics needs to be investigated. The modeling and validation of two-phase flow are the focus in this research field. In this paper the authors first traced the particle trajectory in a SRM chamber by using numerical method, and then developed a new experimental method to measure the particle trajectory in a SRM chamber to validate the numerical results. The experimental method was based on the RTR (X-ray Real-time Radiography) technique and high-speed motion analyzer. A special method was developed to imitate the particle injection on the propellant surface. The calculation results and measurement data show that the trajectory obtained by numerical simulation was in good agreement with the measured one by imposing proper boundary conditions. For particles with diameter of 75μm, the initial velocity factor of particle is approximately 0.4, and the particles pass through the centerline in both calculation and experiment. The present method can be extended to study the impingement of particles on the wall and other related two-phase flow patterns.

Influence of selected parameters on phenomena of two-phase flow and heat exchange in TSL furnace – numerical investigation

2017 ◽  
Vol 27 (12) ◽  
pp. 2799-2815
Author(s):  
Ewa Kolczyk ◽  
Zdzisław Miczkowski ◽  
Józef Czernecki
Keyword(s):  
Numerical Simulation ◽  
Heat Exchange ◽  
Liquid Slag ◽  
Gas Flow ◽  
Two Phase Flow ◽  
New Technology ◽  
Phase Flow ◽  
Two Phase ◽  
Content Type ◽  
Submerged Lance

Purpose The purpose of this study is application of a numerical simulation for determination of the influence of geometric parameters of a furnace and hydrodynamics of the gas introduced by a vertical submerged lance on the process of feed mixing and temperature distribution. Design/methodology/approach A numerical simulation with Phoenics software was applied for modeling of liquid phase movement and heat exchange between the gas supplied through a lance and the slag feed in a top submerged lance (TSL) furnace. The simulation of a two-phase flow of a slag–gas mixture based on the inter phase slip algorithm module was conducted. The influence of selected parameters, such as depth of lance submergence, gas flow rate and change of furnace geometry, on the phenomena of movement was studied. Findings Growth of dynamics of mixing with the depth of lance submergence and with increase of gas velocity in the lance was observed. Formation of a recirculation zone in the liquid slag was registered. Movement of the slag caused by the gas flow brought homogenization of the temperature field. Originality/value The study applied the simulation of a two-phase flow in the liquid slag–gas system in steady state, taking into account heat transfer between phases. It provides possibilities for optimization and selection of process parameters within the scope of the developed new technology using a TSL furnace.

Visualization Study on Two-Phase Flow Behaviors in the Gas-Liquid-Solid Microreactor for Hydrogenation of Nitrobenzene

2016 ◽  
Author(s):  
Hao Feng ◽  
Xun Zhu ◽  
Rong Chen ◽  
Qiang Liao
Keyword(s):  
Flow Rate ◽  
Liquid Flow ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Flow Direction ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Microchannel Reactor ◽  
Two Phase ◽  
Modified Surface

In this study, visualization study on the gas-liquid two phase flow characteristics in a gas-liquid-solid microchannel reactor was carried out. Palladium nanocatalyst was coated onto the polydopamine functionalized surface of the microchannel through eletroless deposition. The materials characterization results indicated that palladium nanocatalyst were well dispersed on the modified surface. The effects of both the gas and liquid flow rates as well as inlet nitrobenzene concentration on the two-phase flow characteristics were studied. The experimental results revealed that owing to the chemical reaction inside the microreactor, the gas slug length gradually decreased along the flow direction. For a given inlet nitrobenzene concentration, increasing the liquid flow rate or decreasing the gas flow rate would make the variation of the gas slug length more obvious. High inlet nitrobenzene concentration would intensify both the nitrobenzene transfer efficiency and gas reactants consumption, and thereby the flow pattern in the microchannel was transferred from Taylor flow into bubble flow. Besides, the effect of both flow rate and original nitrobenzene concentration on the variation of nitrobenzene conversion and the desired product aniline yield were also discussed.

scholarly journals Investigation of Water-Vapor Two-Phase Flow Characteristics in a Tight-Lattice Core by Large-Scale Numerical Simulation, (IV)

2005 ◽  
Vol 4 (2) ◽  
pp. 106-114 ◽  
Author(s):  
Hiroyuki YOSHIDA ◽  
Yasuo OSE ◽  
Masatoshi KURETA ◽  
Takuji NAGAYOSHI ◽  
Kazuyuki TAKASE ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Water Vapor ◽  
Large Scale ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Two Phase ◽  
Lattice Core ◽  
Tight Lattice

Numerical Simulation of the Gas-Solid Two-Phase Flow in the Cement Precalciner Based on Fluent Software

2011 ◽  
Vol 255-260 ◽  
pp. 4232-4236 ◽  
Author(s):  
Ning Ning Xing ◽  
Wei Lin Zhao
Keyword(s):  
Velocity Vector ◽  
Structure Design ◽  
Solid Particles ◽  
Cement Plant ◽  
Phase Flow ◽  
Three Dimension ◽  
Two Phase ◽  
Turbulence Flow ◽  
Fluent Software ◽  
Coal Power

The flow of gas and solid particles in DD-precalciner in the cement plant with capacity of 5000t/d was studied by numerical calculation using Fluent software. The DD-precalciner includes four eccentric burners, two eccentric tertiary air ducts and four feed boxes. The standard k-ε model was proposed to simulate the three-dimension turbulence flow and the movement of solid particles was simulated by particle stochastic trajectory model. The speed contours and velocity vector of different sections as well as the trajectories of solid particles were calculated and analyzed. It indicates that the structure design of DD-precalciner can great improve the combustion of coal power and decomposition of CaCO3 particles.

scholarly journals Research Progress on Numerical Simulation of Two-phase Flow in the Gas-solid Fluidized Bed

2021 ◽  
Vol 259 ◽  
pp. 04002
Author(s):  
Shujie Sun ◽  
Xiaosai Dong ◽  
Jie Wang ◽  
Haodong Zhang ◽  
Zhenya Duan
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Research Progress ◽  
Phase Flow ◽  
Two Phase ◽  
Drag Model ◽  
Reaction Characteristics ◽  
Coupling Algorithm

It is difficult to accurately measure the parameters of solid particles in the experiment of the gas-solid fluidized bed. The numerical simulation plays an important role to accurately describe flow characteristics in the fluidized bed. Combined with the research work of the research group, this paper analyzes the application of numerical simulation of fluidized bed from the aspects of gas-solid coupling algorithm, drag model, flow characteristics, and reaction characteristics based on the previous studies. The specificity improvement of the gas-solid coupling algorithm and the regional application of the drag model is the trend of the recent development of numerical simulation. Previous studies mainly focus on the gas-solid two-phase flow field characteristics in the traditional fluidized bed, but few on the complex flow characteristics such as gas-solid reverse flow and the coupling with reaction characteristics. It is of great significance for designing a novel fluidized bed reactor to realize gas-solid continuous reaction to establish and improve the numerical simulation method of gas-solid non-catalytic reaction.

Visualization Study of Gas-Liquid Two-Phase Flow in a Hydrophobic Pipe

2007 ◽  
Author(s):  
Takayoshi Kikuchi ◽  
Tatsuya Hazuku ◽  
Yutaka Fukuhara ◽  
Tomoji Takamasa ◽  
Takashi Hibiki
Keyword(s):  
Flow Regime ◽  
Void Fraction ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Two Phase ◽  
Experimental Conditions ◽  
Churn Flow ◽  
Effect Of Surface

To evaluate the effect of pipe wall surface wettability on flow characteristics in a vertical upward gas-liquid two-phase flow, a visualization study was performed using an acrylic pipe and a hydrophobic pipe. Such basic flow characteristics as flow patterns, pressure drop and void fraction were investigated in these pipes. In the hydrophobic pipe, an inverted-churn flow regime was observed in a region where the churn flow regime was observed in the acrylic pipe, while a droplet flow regime was observed in the region where an annular flow regime was observed in the acrylic pipe. At a high gas flow rate, the average void fraction in the hydrophobic pipe was higher than in the acrylic pipe. The effect of surface wall wettability on frictional pressure loss was confirmed to be insignificant under the present experimental conditions.

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