Hydrodynamics Simulation of Gas-Solid Flow Field in Conveying Vessel

2011 ◽  
Vol 236-238 ◽  
pp. 1528-1531
Author(s):  
Yue Cui ◽  
Hong Gao ◽  
Jin Sheng Sun ◽  
Xu Chen
Keyword(s):  
Flow Field ◽  
Uniform Distribution ◽  
Volume Fraction ◽  
Dead Zone ◽  
Solid Volume Fraction ◽  
Three Dimensional ◽  
Gas Velocity ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Solid Flow

Flow field of gas and particles in a conveying vessel is investigated by use of a three-dimensional model combined Eulerian approach. Because of the nozzles’ arrangement in this study, the flow patterns of spouts and bubbles can be seen in the gas-solid flow field, which lead to a non-uniform distribution of gas velocity. Solid volume fraction is high near the bottom and low at the top part. The porosity rises with gas speed increasing, as well as time. An improvement is examined to remove the dead zone at the bottom, which results in particles remaining.

Experimental Investigation of a Generic Compressor Bleed System

2006 ◽  
Author(s):  
Reinaldo A. Gomes ◽  
Carsten Schwarz ◽  
Michael Pfitzner
Keyword(s):  
Flow Field ◽  
Annular Flow ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Axial Compressor ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Complex Flow ◽  
Pressure Losses ◽  
Aero Engines

Extensive experimental studies on axial compressor bleed-flow systems have been carried out on a three dimensional model of a generic bleed-flow configuration typical for aero engines. The compressor flow is modeled as a clean annular flow. One row of stator vanes is used to impart a constant swirl upstream of the bleed system. The rig is designed modularly in order to allow for inexpensive changes in all of its components and therefore to enlarge the variability of the model. The research is focused onto the generation of an experimental data base, which can be used to derive correlations for the calculation of effective areas and pressure losses. Those data are gained using steady pneumatic measurement technique. In addition, the highly complex flow field in the manifold, which has an important effect onto the bleed-flow, is analyzed using Doppler-Global-Velocimetry (DGV). These measurements were conducted in collaboration with DLR Cologne, who have developed the DGV technique. In this paper the flow field in the manifold is analyzed in detail for two different configurations featuring two and four bleed ducts, respectively. Furthermore the use of a flush design of the slot is compared with a lip design. These data are compared to results from the literature achieved using 2-dimensional configurations.

Cold and Thermal Flow Field Analysis of Gasoline Engine Exhaust Port Based on CFD and RE

2014 ◽  
Vol 1079-1080 ◽  
pp. 918-921
Author(s):  
Dan Han ◽  
Zhi Xia He ◽  
Guo Jun Zhang ◽  
Shuo Wang ◽  
Qian Wang
Keyword(s):  
Flow Field ◽  
Laser Scanning ◽  
Gasoline Engine ◽  
Three Dimensional ◽  
Field Analysis ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Engine Exhaust ◽  
Exhaust Port ◽  
Cold State

Exhaust passage is a significant part of the gasoline engine, its structure will affects the gas flow characteristics of the engine directly [1]. So, research and analysis of the exhaust tract is essential. In this paper, a detailed analysis of the flow field under cold state and hot state was made. For a start, the method of laser scanning and UG software were used to reverse modeling engine exhaust port and get the three-dimensional model. The next, the unstructured grid with local mesh refinement scheme was used to mesh this three-dimensional model with ICEM. After this, numerical simulations of the exhaust passage with five different valve lifts were carried out under thermal and cold conditions. Finally, comparing the velocity field and pressure field of the exhaust passage under cold state and thermal state, it can be find that the flow field under hot and cold state have similar characteristics. The results of this paper can provide a theoretical basis for following researches of the engine exhaust port.

Three-Dimensional Simulation of Gas-Solid Flow in the Biomass Circulating Fluidized Bed Gasifier’s Riser

2011 ◽  
Vol 383-390 ◽  
pp. 6537-6542
Author(s):  
Wen Yi Chen ◽  
Xin Liu ◽  
Xiao Xu Fan ◽  
Lei Zhe Chu ◽  
Yi Mei Yang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Volume Fraction ◽  
Mutual Influence ◽  
Solid Volume Fraction ◽  
Three Dimensional ◽  
Momentum Exchange ◽  
Solid Flow ◽  
Radial Profiles

Using the Gidaspow model as the momentum exchange coefficient to take a full-loop simulation of miniature circulating fluidized bed gasifier (CFBG) in the lab, and taking mutual influence of different parts in consideration, it focus on the gas-solid flow structure in the riser in this paper. The heterogeneous behavior in the CFBG riser and the radial profiles of solid volume fraction under different solid inventories in simulation are showed in this paper as a replenishment of certain data which are hard to measure in experiments. The results showed it can’t form an obvious core-annulus flow because of the riser’s high height-diameter ratio and the big refeed line diameter. There are clusters growing and dissipation in a short time. A turning point of pressure drop may be seem as a separation of dense area and dilute area.The three-dimensional (3D) simulation revealed the solid flux and the pressure drop agree with the experimental data.

scholarly journals Three Dimensional Model of a High Temperature PEMFC. Study of the Flow Field Effect on Performance

Fuel Cells ◽  
2012 ◽  
Vol 12 (4) ◽  
pp. 566-576 ◽  
Author(s):  
T. Sousa ◽  
M. Mamlouk ◽  
K. Scott ◽  
C. M. Rangel
Keyword(s):  
High Temperature ◽  
Flow Field ◽  
Field Effect ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model

Simulation Research of Small Holes by Combined Ultrasonic and Electrochemical Machining Based on CFX

2013 ◽  
Vol 584 ◽  
pp. 60-66 ◽  
Author(s):  
Ze Xiang Liu ◽  
Min Kang ◽  
Xiu Qing Fu
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Electrochemical Machining ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Two Phase ◽  
Simulation Research ◽  
Ansys Cfx ◽  
Phase Fluid ◽  
Small Holes

A device was designed to study the small holes by the rotary combined ultrasonic and electrochemical machining, and the gap between cathode and anode in the processing was also analyzed. A three-dimensional model of flow field was developed in ANSYS CFX software based on FEM by the gas-liquid two-phase fluid cavitations model as well as the effect of rotary cathode and the vibrated cathode to the flow field was analyzed. The simulation showed that the pressure and the velocity of the electrolyte in the gap were oscillated by additional motion of cathode, which is helpful to the electrochemical machining. The comparison of rotary electrochemical machining and the rotary combined ultrasonic and electrochemical machining showed that the rotary combined ultrasonic and electrochemical machining has better ability of making small holes than that of rotary electrochemical machining

Simulation of the Flow Parameters of the Multi-Microchannel Aerostatic Restrictor

2012 ◽  
Vol 241-244 ◽  
pp. 1278-1284
Author(s):  
Yu Bing Zhang ◽  
Cai Qin Li ◽  
Dong Sheng Li
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Film Thickness ◽  
Three Dimensional ◽  
Simulation Method ◽  
Gas Pressure ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Flow Parameters ◽  
Numerical Simulation Method

A numerical simulation method, FLUENT,has been selected to simulate the flow field parameters of the multi-microchannel aerostatic restrictor. Pressure, temperature and velocity distributions of the restrictor under different gas film thickness and gas pressure were got and compared. Used Pro / E to establish three-dimensional model of restrictor and imported it into GAMBIT for meshing, and then used FLUENT for simulation.

Deposition of Chloride in Two-Phase Flow for the Superheater via Numerical Simulation

2011 ◽  
Vol 354-355 ◽  
pp. 236-239 ◽  
Author(s):  
Song Ying Chen ◽  
Jun Jie Mao
Keyword(s):  
Flue Gas ◽  
Two Phase Flow ◽  
Volume Fraction ◽  
Three Dimensional ◽  
High Volume ◽  
Phase Flow ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Two Phase ◽  
Velocity Magnitude

This paper reports the results of a study on the reason for chlorine-induced corrosion in the superheater, the factor of corrsion is caused by the chloride deposit. A three-dimensional model is performed in order to analyse chloride particles deposit in the flue-gas. The use of CFD codes for modeling of two-phase flow, it is important to know whether or not deposition will be present in some sensitive location. The RNG k-ε turbulence model and mixture model are employed in the article. The predicted results show that the volume fraction of particles phase varies along with the flow field. Chloride particles may deposit where the area of high volume fraction. Actually, under the condition of different velocity magnitude, the deposition of chloride particles is existed on the border of the baffle and at the bottom of the vessel.

Analysis and Numerical Simulation of Flow Field in Centrifugal Pump

2014 ◽  
Vol 1006-1007 ◽  
pp. 131-134
Author(s):  
Yi Jun Zhou ◽  
Hai Yang Xu ◽  
Wang Kan
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Centrifugal Pump ◽  
Static Pressure ◽  
Three Dimensional ◽  
Centrifugal Impeller ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Design And Optimization ◽  
Fluent Software

The inner flow field of centrifugal pump is complex and presents a characteristic of three-dimensional turbulence. Used Solidworks software to establish a three-dimensional model of the pump and impeller, completed the numerical simulation of centrifugal impeller flow field based on the turbulence model and Fluent software, obtained the static pressure and velocity distribution of flow field, provided basis for the design and optimization of the subsequent product.

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