scholarly journals EFFECT OF PARTICLE CONCENTRATION ON TURBULENCE CHARACTERISTICS OF 2-D SOLID-LIQUID TWO-PHASE JET FLOW

1998 ◽  
Vol 42 ◽  
pp. 1177-1182
Author(s):  
Yasuo NIHEI ◽  
Kazuo NADAOKA ◽  
Noriyasu NAKAMURA
Keyword(s):  
Particle Concentration ◽  
Jet Flow ◽  
Two Phase ◽  
Turbulence Characteristics ◽  
Solid Liquid

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

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.

scholarly journals Extreme-Point Symmetric Mode Decomposition to Define the Turbulence Characteristics of a Flume Flow

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Zhi-Peng Shi ◽  
Ting-Ting He ◽  
Gen-Guang Zhang
Keyword(s):  
Extreme Point ◽  
Instantaneous Velocity ◽  
Symmetric Mode ◽  
Modal Decomposition ◽  
Two Phase ◽  
Turbulence Characteristics ◽  
Time Frequency ◽  
Mode Decomposition ◽  
Two Stages ◽  
Solid Liquid

Turbulence is a key feature of solid-liquid two-phase flows, and the pulsating velocity is the basis for calculating turbulence characteristics. In general, the method of mathematical expectation is used to calculate pulsating velocity. However, this method does not reflect the fluctuating state of the instantaneous velocity. Therefore, the method of extreme-point symmetric mode decomposition (ESMD) is adopted to calculate pulsating velocity and turbulence characteristics. The ESMD involves two stages, namely, modal decomposition and time-frequency analysis. The optimal adaptive global mean (AGM), which is the result of modal decomposition, can accurately reflect the fluctuation state of the instantaneous velocity, and the theory of the pulsating velocity defined on this basis is reasonable. Moreover, the flow pattern and turbulence behaviour of a two-phase flow can be predicted using the calculated turbulence characteristics. The method is used to analyse the pulsating velocity of the flume, and its rationality in theoretically predicting the turbulence behaviour of flume flows is demonstrated.

scholarly journals Numerical Simulation Prediction of Erosion Characteristics in a Double-Suction Centrifugal Pump

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1483
Author(s):  
Xijie Song ◽  
Dunzhe Qi ◽  
Lijuan Xu ◽  
Yubin Shen ◽  
Wei Wang ◽  
...  
Keyword(s):  
Flow Rate ◽  
Erosion Rate ◽  
Particle Concentration ◽  
Yellow River ◽  
Centrifugal Pumps ◽  
Two Phase ◽  
Pressure Surface ◽  
Motion Characteristics ◽  
Solid Liquid ◽  
The Impact

The double-suction centrifugal pumps installed along the Yellow River in China face serious sediment erosion due to the high sediment content which causes the poor operation efficiency of the pump units. The particle motion characteristics and erosion characteristics in a pump under different flow rates and different particle concentrations were numerically simulated based on the particle track model of solid-liquid two-phase flow. The results show that the flow rate has a significant effect on the particle tracks and the erosion caused by the particles in the impeller. The total erosion rate is positively correlated with the flow rate, and increases with the increase in flow rate. The vortex and secondary flow in the impeller have obvious influence on the particle trajectory, which increases the particle concentration at the trailing edge of the pressure surface and intensifies the impact erosion in this area. The particles carried by the vortex intensifies the local erosion. The particle concentration mainly affects the erosion rate, but has little effect on the erosion position. The influence of flow rate on pump erosion is greater than that of the particle properties. These results provide a reference for optimization of the design of anti-erosion blades of double-suction pumps and the regulation and operation of pumping stations.

scholarly journals Effect of inert particle concentration on mass transfer between particles and liquid in solid-liquid two-phase upflow through vertical tubes and in stirred tanks.

1987 ◽  
Vol 20 (2) ◽  
pp. 134-140 ◽  
Author(s):  
KEN-ICHI KIKUCHI ◽  
YUSUKE TADAKUMA ◽  
TAKUO SUGAWARA ◽  
HIROYASU OHASHI
Keyword(s):  
Mass Transfer ◽  
Particle Concentration ◽  
Inert Particle ◽  
Stirred Tanks ◽  
Two Phase ◽  
Solid Liquid ◽  
Vertical Tubes

An Experimental Study on the Cuttings Transport in Inclined Slim-Hole Annulus

2012 ◽  
Author(s):  
Y. J. Kim ◽  
S. M. Han ◽  
N. S. Woo
Keyword(s):  
Particle Concentration ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Flow Characteristics ◽  
Directional Drilling ◽  
Cuttings Transport ◽  
Particle Volume ◽  
Two Phase ◽  
Solid Liquid ◽  
And Control

In directional drilling, it is difficult to adjust and control the cuttings, so it is very important to evaluate the flow characteristics of a drilling flow field. In this study, solid-liquid two-phase flow experiments have been carried out in non-Newtonian fluids for hole inclinations from vertical to 75 degrees, flow velocities from 0.33 m/s to 0.66 m/s, particle concentration from 4 to 16 %, and pipe rotations from 0 to 400 rpm. Pressure drop within the test section, and particle volume fraction are measured for the above test conditions. These quantities were influenced by particle concentration within the flow, pipe rotation, flow volume, and inclination of the annulus. Moreover, empirical correlations were developed for estimating friction coefficient and particle volume fraction inside annulus. The new correlations generated in this study are believed to be very practical and handy when they are used in the field. Therefore, this study can provide meaningful data for directional drillings.

Experimental Resistance Measurement on Solid-Liquid Two-Phase Flow in Microchannel

2012 ◽  
Vol 239-240 ◽  
pp. 353-358
Author(s):  
Yong Hong Liu ◽  
Je Eun Choi ◽  
Masahiro Takei ◽  
Xian Tao Wang
Keyword(s):  
Rate Control ◽  
Particle Concentration ◽  
Single Phase ◽  
Two Phase Flow ◽  
Measuring Instruments ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Phenomena ◽  
Flow Rate Control ◽  
Solid Liquid

Monitoring the flow behaviour on the micro-scale is very important in many industrial and biochemical process, the multiphase coexistence in microchannel provide many attractive characteristics compared to a single-phase flow. The precise flow rate control and well-defined channel geometries make it possible for us to make detailed investigation on multiphase flow phenomena. This paper aims at the measurement of resistance distribution in the cross-section of a novel microchannel based on the Agilent measuring instruments. Experimental results verified the possibility of estimation on particle concentration in the solid-liquid two-phase flow by the measurement of resistance distribution in the microchannel.

COUPLED EFFECTS OF CONVECTION AND CONDUCTION ON HEAT TRANSFER IN SOLID-LIQUID TWO-PHASE MEDIA DENSELY LADEN WITH FINITE-SIZED PARTICLES

2018 ◽  
Author(s):  
Jingchen Gu ◽  
Shintaro Takeuchi ◽  
Takeo Kajishima
Keyword(s):  
Heat Transfer ◽  
Two Phase ◽  
Solid Liquid
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