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

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

2004 ◽  
Vol 3 (3) ◽  
pp. 233-241 ◽  
Author(s):  
Hiroyuki YOSHIDA ◽  
Takuji NAGAYOSHI ◽  
Yasuo OSE ◽  
Kazuyuki TAKASE ◽  
Hajime AKIMOTO
Keyword(s):  
Numerical Simulation ◽  
Water Vapor ◽  
Large Scale ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Two Phase ◽  
Lattice Core ◽  
Tight Lattice

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

2005 ◽  
Vol 4 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Hiroyuki YOSHIDA ◽  
Takuji NAGAYOSHI ◽  
Yasuo OSE ◽  
Kazuyuki TAKASE ◽  
Hajime AKIMOTO
Keyword(s):  
Numerical Simulation ◽  
Water Vapor ◽  
Large Scale ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Two Phase ◽  
Lattice Core ◽  
Tight Lattice

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.

Subchannel Analysis on Two-Phase Flow Characteristics Through Narrow Gaps in a Tight-Lattice Rod Bundle

2004 ◽  
Author(s):  
Hidesada Tamai ◽  
Akira Ohnuki ◽  
Hajime Akimoto
Keyword(s):  
Liquid Phase ◽  
Turbulent Mixing ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Cross Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Rod Bundle ◽  
Tight Lattice ◽  
Narrow Gaps

Evaluation of a critical heat flux is one of the most important issues for design of an advanced water-cooled reactor core. Since it becomes difficult to perform full-scale experiments due to a larger scale of the advanced reactor cores, an analytical approach has been widely noticed in the core design. To predict the critical heat flux in high accuracy, it is required to correctly understand a horizontal distribution of a two-phase flow in the rod bundles. In this study, the two-phase flow characteristics through narrow gaps in the tight-lattice 37-rod bundle experiment at JAERI were investigated using the subchannel analysis code, NASCA. At the center of the bundle, liquid flowed toward the periphery due to the diversion cross-flow at the elevation where boiling started and the turbulent mixing and the void drift were not influential as they can be neglected. On the periphery of the bundle, the flow mixings due to the diversion cross flow, turbulent mixing and void drift were almost the same order. Gas flowed in the same way with the liquid phase due to the diversion cross-flow, and the turbulent mixing and the void drift moved the gas in the opposite way of the liquid phase migration. An amount of the diversion cross-flow for the liquid phase increased in proportion to the square of the mass velocity. The characteristics of cross flow were almost the same in the different local power peaking and in the different gap widths in the present model.

scholarly journals Simulation Analysis of Capacitance Method in Two-Phase Flow Concentration Measurement by Coupled Fields

2016 ◽  
Author(s):  
Xiaoxin Wang ◽  
Hongli Hu ◽  
Lin Li ◽  
Bo Wang
Keyword(s):  
Numerical Simulation ◽  
Two Phase Flow ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Simulation Method ◽  
Concentration Measurement ◽  
Phase Flow ◽  
Two Phase ◽  
Time Dynamic

This paper proposed three-dimensional numerical simulation method by coupling of electrostatic and fluid fields to evaluating the performance of electrical sensor in the concentration measurement of gas/solid two-phase flow. Compared with the static numerical simulation, this real-time dynamic 3-D simulation method can research on a designed capacitance sensor combining the dynamic characteristics of the two-phase flows for concentration measurement. Several fluid-electrostatic models of transmission pipes with different sensor structures are built. Under different test positions and different particle concentrations, the flow characteristics and the corresponding electric signals can be obtained, and the correlation coefficient between the concentration values and the capacitance values are used for performance evaluation of the sensors. The effects of flow regimes on concentration measurement are also been investigated in this paper. To validate the results of simulation, an experimental platform with horizontal straight pipe for phase volume concentration measurement of solid/air two-phase flow is built, and the experimental results agree well with simulation conclusions. The simulation and test results show that the coupling models can give constructive reference opinions for the sensor design and collection of installation position in different transmission pipelines, which are very important for the practical process of pneumatic conveying system.

Study on the prediction method and the flow characteristics of gas-liquid two-phase flow patterns in the suction chamber

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chunlei Shao ◽  
Ning Bao ◽  
Sheng Wang ◽  
Jianfeng Zhou
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
Prediction Method ◽  
Simulation Method ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Content Type

Purpose The purpose of this paper is to propose a prediction method of gas-liquid two-phase flow patterns and reveal the flow characteristics in the suction chamber of a centrifugal pump. Design/methodology/approach A transparent model pump was experimentally studied, and the gas-liquid two-phase flow in the pump was numerically simulated based on the Eulerian–Eulerian heterogeneous flow model. The numerical simulation method was verified from three aspects: the flow pattern in the suction chamber, the gas spiral length and the external characteristics of the pump. The two-phase flow in the suction chamber was studied in detail by using the numerical simulation method. Findings There are up to eight flow patterns in the suction chamber. However, at a certain rotational speed, only six flow patterns are observed at the most. At some rotational speeds, only four flow patterns appear. The gas spiral length has little relationship with the gas flow rate. It decreases with the increase of the liquid flow rate and increases with the increase of the rotational speed. The spiral flow greatly increases the turbulence intensity in the suction chamber. Originality/value A method for predicting the flow pattern was proposed. Eight flow patterns in the suction chamber were identified. The mechanism of gas-liquid two-phase flow in the suction chamber was revealed. The research results have reference values for the stable operation of two-phase flow pumps and the optimization of suction chambers.

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