Numerical Simulation of Spatially Resolved Particle Deposition in Accelerating flows

2019 ◽  
Author(s):  
Nikul Vadgama ◽  
Peter Forsyth ◽  
Matthew McGilvray ◽  
David R. Gillespie
Keyword(s):  
Numerical Simulation ◽  
Particle Deposition ◽  
Spatially Resolved ◽  
Accelerating Flows

scholarly journals Numerical Simulation of the Aerosol Particle Motion in Granular Filters with Solid and Porous Granules

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 268
Author(s):  
Olga V. Soloveva ◽  
Sergei A. Solovev ◽  
Ruzil R. Yafizov
Keyword(s):  
Numerical Simulation ◽  
Aerosol Particle ◽  
Particle Deposition ◽  
Particle Diameter ◽  
Deposition Efficiency ◽  
Hydrodynamic Resistance ◽  
Hydrodynamic Properties ◽  
Granular Filters ◽  
Limiting Value ◽  
Good Agreement

In this work, a study was carried out to compare the filtering and hydrodynamic properties of granular filters with solid spherical granules and spherical granules with modifications in the form of micropores. We used the discrete element method (DEM) to construct the geometry of the filters. Models of granular filters with spherical granules with diameters of 3, 4, and 5 mm, and with porosity values of 0.439, 0.466, and 0.477, respectively, were created. The results of the numerical simulation are in good agreement with the experimental data of other authors. We created models of granular filters containing micropores with different porosity values (0.158–0.366) in order to study the micropores’ effect on the aerosol motion. The study showed that micropores contribute to a decrease in hydrodynamic resistance and an increase in particle deposition efficiency. There is also a maximum limiting value of the granule microporosity for a given aerosol particle diameter when a further increase in microporosity leads to a decrease in the deposition efficiency.

Numerical Simulation of Powder Dispersion Performance by Different Mesh Types

2016 ◽  
Vol 680 ◽  
pp. 82-85
Author(s):  
Jian Cai ◽  
Lan Chen ◽  
Umezuruike Linus Opara
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Fine Particle ◽  
Particle Deposition ◽  
Tetrahedral Mesh ◽  
Computational Time ◽  
Kinetic Characteristics ◽  
Powder Dispersion ◽  
Simulation Results ◽  
Time Accuracy

OBJECTIVE To investigate the influence of mesh type on numerical simulating the dispersion performance of micro-powders through a home-made tube. METHODS With the computational fluid dynamics (CFD) method, a powder dispersion tube was meshed in three different types, namely, tetrahedral, unstructured hexahedral and prismatic-tetrahedral hybrid meshes. The inner flow field and the kinetic characteristics of the particles were investigated. Results of the numerical simulation were compared with literature evidences. RESULTS The results showed that using tetrahedral mesh had the highest computational efficiency, while employing the unstructured hexahedral mesh obtained more accurate outlet velocity. The simulation results of the inner flow field and the kinetic characteristics of the particles were slightly different among the three mesh types. The calculated particle velocity using the tetrahedral mesh had the best correlation with the changing trend of the fine particle mass in the first 4 stages of the new generation impactor (NGI) (R2 = 0.91 and 0.89 for powder A and B, respectively). Conclusions Mesh type affected computational time, accuracy of simulation results and the prediction abilities of fine particle deposition.

scholarly journals Numerical Simulation of Particle Deposition in an Upper Respiratory Tract

2018 ◽  
Vol 32 (1) ◽  
pp. 132-139
Author(s):  
Sayaka FUJII ◽  
Minori SHIROTA ◽  
Yuki KASAMATSU ◽  
Tsubasa TANABE ◽  
Takao INAMURA ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Respiratory Tract ◽  
Particle Deposition ◽  
Upper Respiratory Tract ◽  
Upper Respiratory

The Effects of Simulated Particle Deposition on Film Cooling

2009 ◽  
Author(s):  
S. A. Lawson ◽  
K. A. Thole
Keyword(s):  
Film Cooling ◽  
Momentum Flux ◽  
Particle Deposition ◽  
Power Plants ◽  
Alternative Fuels ◽  
Flux Ratio ◽  
Combined Cycle ◽  
Spatially Resolved ◽  
Film Cooling Holes ◽  
Low Speed Wind Tunnel

Diminishing natural gas resources has increased incentive to develop cleaner, more efficient combined cycle power plants capable of burning alternative fuels such as coal-derived synthesis gas (syngas). Although syngas is typically filtered, particulate matter still exists in the hot gas path that has proven to be detrimental to the life of turbine components. Solid and molten particles deposit on film cooled surfaces that can alter cooling dynamics and block cooling holes. To gain an understanding of the effects that particle deposits have on film cooling, a methodology was developed to simulate deposition in a low speed wind tunnel using a low melt wax, which can simulate solid and molten phases. A facility was constructed to simulate particle deposition on a flat plate with a row of film cooling holes. Infrared thermography was used to measure wall temperatures for quantifying spatially resolved adiabatic effectiveness values in the vicinity of the film cooling holes as deposition occurred. Results showed that deposition reduced cooling effectiveness by approximately 20% at momentum flux ratios of 0.23 and 0.5 and only 6% at a momentum flux ratio of 0.95.

Simulation Analysis of Splat Deposition in Plasma Spray Forming

2011 ◽  
Vol 291-294 ◽  
pp. 505-508
Author(s):  
Zi Yu Zhao ◽  
Bi Bo Xia ◽  
Su Zhi Zhang ◽  
Li Wang
Keyword(s):  
Numerical Simulation ◽  
Plasma Spray ◽  
Particle Deposition ◽  
Simulation Analysis ◽  
Spray Forming ◽  
Impact Factors ◽  
Ansys Software ◽  
Coating Quality ◽  
Plasma Spray Forming ◽  
The Impact

Splat deposition is an important part influencing coating quality in plasma spray forming. Flatten behavior of a single Ni droplet falling on a smooth substrate is evaluated by numerical simulation of ANSYS software, this paper meanwhile researches a single Ni particle deposition in the surface of flattened Al2O3 sheet and thin Al particles, the impact factors of particles flattening and the mechanism of the interaction between particles are also studied. The results have benefit to improving the coating porosity and bond strength between particles.

Fabrication of Capillary Fiber with Annular Light Waveguide Layer and Numerical Simulation of Particle Deposition Process

2012 ◽  
Vol 10 (7) ◽  
pp. 1426-1429
Author(s):  
T. Zhang ◽  
M. H. Zhang ◽  
G. Y. Liu ◽  
Z. C. Fan ◽  
X. Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Particle Deposition ◽  
Deposition Process ◽  
Waveguide Layer ◽  
Light Waveguide
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