A numerical study of confined coaxial swirl flows with wall mass injection

1986 ◽  
Author(s):  
E. KILIK
Keyword(s):  
Numerical Study ◽  
Mass Injection ◽  
Swirl Flows ◽  
Wall Mass

Numerical Investigation on Resistance Reducing Effect by Mass Injection through Porous Wall

2014 ◽  
Vol 670-671 ◽  
pp. 838-842
Author(s):  
Yong Zhao ◽  
Tian Lin Wang
Keyword(s):  
Numerical Investigation ◽  
Numerical Study ◽  
Porous Wall ◽  
Frictional Resistance ◽  
Resistance Coefficient ◽  
Good Prediction ◽  
Complex Flow ◽  
Mass Injection ◽  
Layer Flow ◽  
Frictional Resistance Coefficient

A numerical study of flow in two-dimensional turbulent boundary layer flow with mass injection through a porous wall is conducted by Reynolds averaged numerical simulation (RANS) in this paper. Numerical results with available experimental data show that Wilcox (2006) k-w turbulence model can give good prediction in this complex flow. The comparison between mass injection and no mass injection for the local frictional resistance coefficient are performed. Numerical investigation indicates that mass injection may reduce the resistance significantly, which is confirmed by comparison of velocity profiles qualitatively.

Numerical Study of Effects of Wall Mass Transfer Condition for Geometry Factor

2016 ◽  
Vol 2016.21 (0) ◽  
pp. D112
Author(s):  
Tatsuya TSUNEYOSHI ◽  
Kazuaki KAMIYA ◽  
Yoichi UTANOHARA ◽  
Takahiro ITO ◽  
Yoshiyuki TSUJI
Keyword(s):  
Mass Transfer ◽  
Numerical Study ◽  
Transfer Condition ◽  
Geometry Factor ◽  
Wall Mass

scholarly journals Numerical modeling of peat burning processes in a vortex furnace with countercurrent swirl flows

2020 ◽  
pp. 158-158
Author(s):  
Andriy Redko ◽  
Yurii Burda ◽  
Rafael Dzhyoiev ◽  
Igor Redko ◽  
Volodymyr Norchak ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Heat Load ◽  
Numerical Study ◽  
Combustion Process ◽  
Dust Particles ◽  
Design Parameters ◽  
Complete Combustion ◽  
Vortex Furnace ◽  
Swirl Flows ◽  
Furnace Volume

The paper presents the process of peat burning in a swirl furnace with countercurrent swirl flows and the results of a numerical study. The cyclone-vortex technology of solid fuel combustion allows the furnace volume of a boiler unit, its dimensions and weight to be reduced. The aim of the work is a numerical study of the combustion of pulverized peat in a cylindrical vortex furnace with countercurrent swirl flows. The results of computer simulation of the combustion of pulverized peat with a moisture content of 40%, an ash content of 6% and a higher heat of combustion Q?? = 12.3 MJ/kg are presented. The results of the influence of the design parameters of the furnace and heat load (from 100% to 15%) are given as well. When the heat load is reduced to 15%, the entrainment of unburnt particles increases. The cooled and adiabatic furnace is studied. A significant entrainment of unburned particles is observed n a cooled furnace. The fields of temperature distribution, gas velocity and particle trajectory in the volume and at the outlet of the furnace are determined. The three-dimensional temperature distribution in the furnace volume indicates the combustion of peat particles at temperatures (1300-1450?C). Values of the tangential velocity of a swirl flow near the furnace outlet reach 150 - 370 m/s, which ensures the efficiency of separation of fuel particles and a reduction in heat loss due to mechanical underburning (up to 0.06%). The results of a numerical study show that the diameter of peat particles affects the combustion process, namely coke of particles with an initial diameter from 25 microns to 250 microns burns out by 96%, and particles with a diameter of about 1000 microns are carried away from the furnace and do not burn. The furnace provides a complete combustion of dust particles of peat by 99.8% and volatiles by 100%.

scholarly journals Numerical Study of Laminar Flow and Mass Transfer for In-Line Spacer-Filled Passages

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Steven B. Beale ◽  
Jon G. Pharoah ◽  
Ashwani Kumar
Keyword(s):  
Mass Transfer ◽  
Driving Force ◽  
Numerical Study ◽  
Mean Flow ◽  
Process Industries ◽  
Fully Developed Flow ◽  
Flow Reynolds Number ◽  
Variable Wall ◽  
Blowing Parameter ◽  
Wall Mass

Performance calculations for laminar fluid flow and mass transfer are presented for a passage containing cylindrical spacers configured in an inline-square arrangement, typical of those employed in the process industries. Numerical calculations are performed for fully-developed flow, based on stream-wise periodic conditions for a unit cell and compared with those obtained for developing regime in a row of ten such units. The method is validated for an empty passage, i.e., a plane duct. Results are presented for the normalized mass transfer coefficient and driving force, as a function of mean flow Reynolds number, and also the wall mass flux, or blowing parameter. Both constant and variable wall velocities were considered, the latter being typical of those found in many practical membrane modules.

Numerical Study of Vortex Evolution and Correlation between Twin Swirling Flows

2012 ◽  
Vol 516-517 ◽  
pp. 976-979 ◽  
Author(s):  
Nan Gui
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Numerical Study ◽  
Swirling Flows ◽  
Cyclone Separator ◽  
Velocity Correlation ◽  
Swirl Number ◽  
Swirling Jets ◽  
Swirl Flows ◽  
Energy Engineering

Swirling flows are widely used in energy engineering, such as swirling combustor, cyclone separator in pulverized coal burners. The vortex evolution and correlation between twin swirling flows are investigated via direct numerical simulation. Three typical swirl flows with different swirl number are simulated. The structure of vortex evolution, velocity correlation between the twin flows are illustrated and analyzed in detail. The results show the phase-locked correlation of flow velocity between the twin swirling jets which would be useful and helpful for improving the understanding of aerodynamics of multi-swirling systems.

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