Particle size analysis by transmission fluctuation spectrometry in the two-Phase flow irradiated by a rectangular narrow beam

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.

Download Full-text

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.

Download Full-text

Particle size measurement in gas-solid two-phase flow using acoustic sensors

10.1063/1.4872119 ◽

2014 ◽

Cited By ~ 1

Author(s):

Miao Guo ◽

Yong Yan ◽

Yonghui Hu ◽

Duo Sun ◽

Xiangcheng Qian ◽

...

Keyword(s):

Particle Size ◽

Two Phase Flow ◽

Phase Flow ◽

Acoustic Sensors ◽

Size Measurement ◽

Two Phase ◽

Particle Size Measurement

Download Full-text

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.431-432.483 ◽

2010 ◽

Vol 431-432 ◽

pp. 483-486

Author(s):

Lan Yu Yang ◽

Yan Ma

Keyword(s):

Power Generation ◽

Particle Size ◽

Two Phase Flow ◽

Influence Factors ◽

Particle Diameter ◽

Phase Flow ◽

Two Phase ◽

Particle Characteristics ◽

Biomass Resources ◽

Grading Model

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.

Download Full-text

Numerical and experimental research on the erosion of solid-liquid two-phase flow in transport butterfly valve based on DEM method

Industrial Lubrication and Tribology ◽

10.1108/ilt-12-2020-0454 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Benliang Xu ◽

Zuchao Zhu ◽

Zhe Lin ◽

Dongrui Wang ◽

Guangfei Ma

Keyword(s):

Particle Size ◽

Turbulence Model ◽

High Speed ◽

Two Phase Flow ◽

Flow Characteristics ◽

Phase Flow ◽

Butterfly Valve ◽

Two Phase ◽

Content Type ◽

Solid Liquid

Purpose The purpose of this paper is to analyze the mechanism of particle erosion in butterfly valve pipelines under hydraulic transportation conditions. The results will affect the sealing and safety of butterfly valve pipelines and hopefully serve as reference for the anti-erosion design of butterfly valve pipelines. Design/methodology/approach Through the discrete element method (DEM) simulation that considers the force between particles, the detached eddy simulation (DES) turbulence model based on realizable k-epsilon is used to simulate the solid-liquid two-phase flow-induced erosion condition when the butterfly valve is fully opened. The simulation is verified by building an experimental system correctness. The solid-liquid two-phase flow characteristics, particle distribution and erosion characteristics of the butterfly valve pipeline under transportation conditions are studied. Findings The addition of particles may enhance the high-speed area behind the valve. It first increases and then decreases with increasing particle size. With increasing particle size, the low-velocity particles change from being uniformly distributed in flow channel to first gathering in the front of the valve and, then, to gathering in lower part of it. Fluid stagnation at the left arc-shaped flange leads to the appearance of two high-speed belts in the channel. With increasing fluid velocity, high-speed belts gradually cover the entire valve surface by focusing on the upper and lower ends, resulting in the overall aggravation of erosion. Originality/value Considering the complexity of solid-liquid two-phase flow, this is the first time that the DEM method with added inter-particle forces and the DES turbulence model based on realizable k-epsilon has been used to study the flow characteristics and erosion mechanism of butterfly valves under fully open transportation conditions.

Download Full-text

Experimental Investigation of Pressure Drop in One Phase Flow, Particle-Liquid Two-Phase Flow, and Porous Media Consisting of the Same Particle Size

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.283-286.599 ◽

2009 ◽

Vol 283-286 ◽

pp. 599-603

Author(s):

Hikmet Ş. Aybar ◽

Mohsen Sharifpur ◽

Roozbeh Vaziri

Keyword(s):

Particle Size ◽

Porous Media ◽

Pressure Gradient ◽

Two Phase Flow ◽

Water Pressure ◽

Spherical Particles ◽

Phase Flow ◽

Two Phase ◽

The One ◽

Flow Particle

Many researches have performed some studies about pressure gradient in the one phase flow, particle-liquid two-phase flow and porous media. However, there is no any report about interaction among them. In this study, this interaction idea is developed by using the same particle size for particle-liquid two-phase flow and porous media. For the experimental study, an apparatus is designed, and at the first step one phase water pressure gradient is investigated, next in the further steps, little by little spherical particles are added to the cycle till accumulation of the particles did not allow any movement to the particles (i.e. porous media occur), and after that well pack porous media is investigated. The results confirm the relation between pressure gradient over mass flow rate in the one phase flow, particle-liquid two-phase flow and porous media obeys as a parabolic curve.

Download Full-text

Fundamentals of particle size analysis by fluctuating transmission autocorrelation with an extremely narrow beam

Measurement ◽

10.1016/j.measurement.2006.11.021 ◽

2008 ◽

Vol 41 (1) ◽

pp. 55-64 ◽

Cited By ~ 1

Author(s):

Jianqi Shen ◽

Bin Yu ◽

Yamin Xu ◽

Lei Liu ◽

Ulrich Riebel ◽

...

Keyword(s):

Particle Size ◽

Particle Size Analysis ◽

Size Analysis ◽

Narrow Beam

Download Full-text

Numeration Simulation of Solid-Liquid Two-Phase Flow in Centrifugal Sewerage Pump

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.345 ◽

2010 ◽

Vol 44-47 ◽

pp. 345-348 ◽

Cited By ~ 4

Author(s):

Jian Hua Liu ◽

Ming Yi Zhu

Keyword(s):

Particle Size ◽

Solid Particle ◽

Working Condition ◽

Two Phase Flow ◽

Volume Fraction ◽

Phase Flow ◽

Operation Condition ◽

Two Phase ◽

And Performance ◽

Solid Liquid

By Means of Fluent 6.3，the paper simulated the solid-liquid two-phase flow to a centrifugal sewerage pump，using Eulerian Mixture Model under different working condition and different particle size. The simulation draws some conclusion on distributive rules of solid particle inside impeller passage. The results for this simulation were as following: Distributive rules of solid particle inside impeller passage mainly relate to particle size. Meanwhile，the volume fraction of particles and operation condition have influence on distributive rules of solid particle. The simulated results can explain commendably that attrition took place inside pump passage when pump transported solid-liquid two-phase flow. Meanwhile，the simulated results have reference price to improve the design for pump and performance of pump.

Download Full-text

Numerical Simulation of Fine Particle Solid-Liquid Two-Phase Flow in a Centrifugal Pump

Shock and Vibration ◽

10.1155/2021/6631981 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Yanping Wang ◽

Bozhou Chen ◽

Ye Zhou ◽

Jianfeng Ma ◽

Xinglin Zhang ◽

...

Keyword(s):

Particle Size ◽

Internal Pressure ◽

Centrifugal Pump ◽

Fine Particle ◽

Volume Concentration ◽

Two Phase Flow ◽

Solid Particles ◽

Phase Flow ◽

Two Phase ◽

Solid Liquid

To study the effect of fine particle size and volume concentration on the performance of solid-liquid two-phase centrifugal pump, the mixture multiphase flow model, RNG k-ε turbulence model, and SIMPLEC algorithm were used to simulate the two-phase flow of the centrifugal pump. The effects of particle size and volume concentration on internal pressure distribution, solid volume distribution, and external characteristics were analyzed. The results show that under the design discharge conditions, with the increase of particle size and volume concentration, the internal pressure of the flow field will decrease, and the volume fraction of solid phase in the impeller passage will also decrease as a whole. The solid particles gradually migrate from the suction surface to the pressure surface, and the particles in the volute channel are mainly concentrated in the flow channel near the outlet side of the volute. With the increase of particle size and volume concentration, the negative pressure value at the inlet of centrifugal pump increases, the total pressure difference at the inlet and outlet decreases, and the head and efficiency decrease accordingly.

Download Full-text