scholarly journals Flow Characteristics of Soft Particle In Low Velocity Pneumatic Conveying in a Horizontal Pipe

2007 ◽  
Vol 44 (3) ◽  
pp. 221-221
Author(s):  
Hiroyuki Asou
Keyword(s):  
Flow Characteristics ◽  
Soft Particle ◽  
Pneumatic Conveying ◽  
Low Velocity ◽  
Horizontal Pipe

107 Low Velocity Pneumatic Conveying of Pellet in a Horizontal pipe

2000 ◽  
Vol 2000.53 (0) ◽  
pp. 13-14
Author(s):  
Hiroyuki ASOU ◽  
Yuji TOMITA ◽  
Katuya FUNATU
Keyword(s):  
Pneumatic Conveying ◽  
Low Velocity ◽  
Horizontal Pipe

Research on the Pneumatic Conveying of the Sand in the Horizontal Pipe Based on FLUENT

2016 ◽  
Vol 11 (2) ◽  
pp. 159-165 ◽  
Author(s):  
Dan-yang Li ◽  
Shu Liu ◽  
Xiao-ning Wang
Keyword(s):  
Particle Diameter ◽  
Flow Characteristics ◽  
Axial Direction ◽  
Theoretical Research ◽  
Pneumatic Conveying ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Actual Measurement ◽  
Fluid Analysis ◽  
Euler Model

Abstract The pneumatic conveying experiment bed has been established to study the flow characteristics of air- solids two-phase flow in horizontal pipeline. Euler model was applied to simulate it based on analysis of Gambit and fluid analysis software-fluent. The simulated results indicated: under the same gas phase conveying flow and pressure, the bigger particle diameter is, the bigger pressure drop is in the horizontal pipeline. The smaller particle diameter is, the more uniform of the particle’s distribution is, and the more easily obtaining the acceleration is. Particle concentration at the bottom of the horizontal pipe is increasing in the axial direction, while close to the tail pipe it will be reduce. The simulated conclusion is consistent with the actual measurement results, herewith rendering some footing for engineering design and theoretical research on pneumatic conveying systems.

Low-velocity pneumatic conveying in horizontal pipe for coarse particles and fine powders

Particuology ◽  
2008 ◽  
Vol 6 (5) ◽  
pp. 316-321 ◽  
Author(s):  
Yuji Tomita ◽  
Vijay Kumar Agarwal ◽  
Hiroyuki Asou ◽  
Katsuya Funatsu
Keyword(s):  
Coarse Particles ◽  
Pneumatic Conveying ◽  
Low Velocity ◽  
Horizontal Pipe ◽  
Fine Powders

Prediction of Flow Characteristics of Bimodal Slurry in Horizontal Pipe Flow

2008 ◽  
Vol 26 (4) ◽  
pp. 361-379 ◽  
Author(s):  
U. Kumar ◽  
S. N. Singh ◽  
V. Seshadri
Keyword(s):  
Pipe Flow ◽  
Flow Characteristics ◽  
Horizontal Pipe

Computational investigation of particle flow characteristics in pressurised dense phase pneumatic conveying systems

2018 ◽  
Vol 329 ◽  
pp. 241-251 ◽  
Author(s):  
Shanshan Sun ◽  
Zhulin Yuan ◽  
Zhengbiao Peng ◽  
Behdad Moghtaderi ◽  
Elham Doroodchi
Keyword(s):  
Flow Characteristics ◽  
Particle Flow ◽  
Pneumatic Conveying ◽  
Computational Investigation ◽  
Dense Phase

scholarly journals Fish responses to flow velocity and turbulence in relation to size, sex and parasite load

2014 ◽  
Vol 11 (91) ◽  
pp. 20130814 ◽  
Author(s):  
F. A. Hockley ◽  
C. A. M. E. Wilson ◽  
A. Brew ◽  
J. Cable
Keyword(s):  
Poecilia Reticulata ◽  
Flow Characteristics ◽  
Parasite Load ◽  
Hydrodynamic Drag ◽  
Flow Conditions ◽  
Low Velocity ◽  
Heterogeneous Flow ◽  
High Turbulence ◽  
Balance Energy ◽  
Riverine Fish

Riverine fish are subjected to heterogeneous flow velocities and turbulence and may use this to their advantage by selecting regions that balance energy expenditure for station holding while maximizing energy gain through feeding opportunities. This study investigated microhabitat selection by guppies Poecilia reticulata in terms of flow characteristics generated by hemisphere boulders in an open channel flume. Velocity and turbulence influenced the variation in swimming behaviour with respect to size, sex and parasite intensity. With increasing body length, fish swam further and more frequently between boulder regions. Larger guppies spent more time in the areas of high-velocity and low-turbulence regions beside the boulders, whereas smaller guppies frequented the low-velocity and high-turbulence regions directly behind the boulders. Male guppies selected the regions of low velocity, indicating possible reduced swimming ability owing to hydrodynamic drag imposed by their fins. With increasing Gyrodactylus turnbulli burden, fish spent more time in regions with moderate velocity and lowest turbulent kinetic energy which were the most spatially and temporally homogeneous in terms of velocity and turbulence. These findings highlight the importance of heterogeneous flow conditions in river channel design owing to the behavioural variability within a species in response to velocity and turbulence.

Pressure drop prediction in low-velocity pneumatic conveying

1994 ◽  
Vol 81 (2) ◽  
pp. 125-137 ◽  
Author(s):  
B. Mi ◽  
P.W. Wypych
Keyword(s):  
Pressure Drop ◽  
Pneumatic Conveying ◽  
Low Velocity

Effects of Quenching Heat Preserving Time on Structure and Properties of Boron-Containing High-Cr White Cast Iron

2012 ◽  
Vol 508 ◽  
pp. 267-270
Author(s):  
Cun Lai Zhang ◽  
Qi Bin Xin
Keyword(s):  
Two Phase Flow ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Pneumatic Conveying ◽  
Backward Facing Step ◽  
Two Phase ◽  
Pressure Losses ◽  
Gas Drilling ◽  
Air Drilling ◽  
Annular Pipe

Air drilling technology has been widely used in the oil and gas exploration, coal, geothermal, geological exploration, nuclear industry and other fields due to its high drilling rate and low cost. However, the design of the pneumatic conveying system for the mineral detritus is still largely based on empiricism. The paper was set in the background of gas drilling, mainly studied the gas-solids two-phase flow characteristics in 90 degree bent annular pipe and backward-facing step of an annular pipe, which are very important parts of air drilling. They refer to the bent part and backward-facing step of an annular channel formed by the drill pipe and the borehole wall. A detailed numerical simulation and experimental studies were carried out for the flow structure and pressure losses of gas-solid two-phase in the annular pipe of gas drilling. Since a unified theory has not been developed for the two-phase flow in annular pipe, a lot of experimental work should be conducted. In the experimental research, the paper independently designed and built an annular pipe pneumatic conveying system with 90 degree bend and backward-facing step, including designing material screw feeder, material receiving hopper, pipeline, control system, data acquisition system, and etc. As known, many parameters, such as gas velocity, diameter and density of the particle, and solids loading ratio, can influence the conveying process. How these primordial influence factors act on the pressure losses of two-phase flow in annular pipe was analyzed in this paper. In the numerical simulation research, turbulent two-phase flow calculations were performed with a commercial CFD computer code referred to as FLUENT to study the gas-solid two phase flow in the sections of backward-facing step and 90 degree bent pipe respectively by using Euler-Lagrange method. The RNG κ-ε model and stochastic tracking were involved in the calculation of turbulence dispersion of two phases. The discrete phase model was performed for the solid phase. In the end, the numerical study 3-D results were translated to 1-D results using the standard averaging transformation to compare with experimental results. Predicted results obtained for pressure drop and velocity variations in full developed flows in the cases examined are in good qualitative agreement and are not in quantitative agreement with experimental data. The deviations between the simulations and experimental data lie in the range of 20%-30%. These results suggest commercial CFD codes such as FLUENT can be used productively for investigations into gas-solid two-phase flow phenomena and as an aid in pneumatic conveying design. The studies of the two-phase flow characteristics in the paper will contribute to reliable determination of the optimal condition of pneumatic conveying in gas drilling.

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