Details
| Original language | English |
|---|---|
| Pages (from-to) | 553-576 |
| Number of pages | 24 |
| Journal | Atomization and Sprays |
| Volume | 29 |
| Issue number | 6 |
| Publication status | Published - 2019 |
Abstract
Spray breakup is an important phenomenon for the injection of a urea-water solution in selective catalytic reduction systems for efficient reduction of NOx from diesel engine exhaust gas. The resulting spray distribution of the urea-water solution has a great effect on the efficiency of the SCR system and possibly determines the formation of urea deposits. For air-assisted liquid breakup in a hot gas, the volume-of-fluid (VOF) simulation model is suitable to capture the interface between the liquid and gaseous fluids. A three-dimensional computational fluid dynamics modeling for air-assisted spray breakup of the urea-water solution was conducted using a volume-of-fluid method. A second order high-resolution interface capturing convection discretization scheme was applied to capture the interface between phases. A sharpening factor was used to reduce the numerical diffusion of the ligaments. An algorithm was written, which scans the ligaments from the running simulation at the predetermined time interval and export their properties. The simulation facilitated detailed investigation of spray characteristics, e.g., spray penetration, spray angle, droplet spectrum, and the possibility of deposit formation on the injector. The spray characteristics from VOF simulations were in good agreement with the high-speed shadowgraphy measurements performed at a hot gas test-rig.
Keywords
- Air-assisted injection, Interface capturing scheme, Multiphase flow, Primary breakup, Spray breakup, Urea-water solution spray, Volume-of-fluid
ASJC Scopus subject areas
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In: Atomization and Sprays, Vol. 29, No. 6, 2019, p. 553-576.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Modeling of air-assisted spray breakup of urea-water solution using a volume-of-fluid method
AU - Naik, Amit
AU - Höltermann, Markus
AU - Lauer, Eric
AU - Blodig, Stefan
AU - Dinkelacker, Friedrich
N1 - Funding Information: Part of this work has received funding from the European Union's Horizon 2020 research and innovation program under Grant No. 634135.
PY - 2019
Y1 - 2019
N2 - Spray breakup is an important phenomenon for the injection of a urea-water solution in selective catalytic reduction systems for efficient reduction of NOx from diesel engine exhaust gas. The resulting spray distribution of the urea-water solution has a great effect on the efficiency of the SCR system and possibly determines the formation of urea deposits. For air-assisted liquid breakup in a hot gas, the volume-of-fluid (VOF) simulation model is suitable to capture the interface between the liquid and gaseous fluids. A three-dimensional computational fluid dynamics modeling for air-assisted spray breakup of the urea-water solution was conducted using a volume-of-fluid method. A second order high-resolution interface capturing convection discretization scheme was applied to capture the interface between phases. A sharpening factor was used to reduce the numerical diffusion of the ligaments. An algorithm was written, which scans the ligaments from the running simulation at the predetermined time interval and export their properties. The simulation facilitated detailed investigation of spray characteristics, e.g., spray penetration, spray angle, droplet spectrum, and the possibility of deposit formation on the injector. The spray characteristics from VOF simulations were in good agreement with the high-speed shadowgraphy measurements performed at a hot gas test-rig.
AB - Spray breakup is an important phenomenon for the injection of a urea-water solution in selective catalytic reduction systems for efficient reduction of NOx from diesel engine exhaust gas. The resulting spray distribution of the urea-water solution has a great effect on the efficiency of the SCR system and possibly determines the formation of urea deposits. For air-assisted liquid breakup in a hot gas, the volume-of-fluid (VOF) simulation model is suitable to capture the interface between the liquid and gaseous fluids. A three-dimensional computational fluid dynamics modeling for air-assisted spray breakup of the urea-water solution was conducted using a volume-of-fluid method. A second order high-resolution interface capturing convection discretization scheme was applied to capture the interface between phases. A sharpening factor was used to reduce the numerical diffusion of the ligaments. An algorithm was written, which scans the ligaments from the running simulation at the predetermined time interval and export their properties. The simulation facilitated detailed investigation of spray characteristics, e.g., spray penetration, spray angle, droplet spectrum, and the possibility of deposit formation on the injector. The spray characteristics from VOF simulations were in good agreement with the high-speed shadowgraphy measurements performed at a hot gas test-rig.
KW - Air-assisted injection
KW - Interface capturing scheme
KW - Multiphase flow
KW - Primary breakup
KW - Spray breakup
KW - Urea-water solution spray
KW - Volume-of-fluid
UR - http://www.scopus.com/inward/record.url?scp=85077860984&partnerID=8YFLogxK
U2 - 10.1615/atomizspr.2019030987
DO - 10.1615/atomizspr.2019030987
M3 - Article
AN - SCOPUS:85077860984
VL - 29
SP - 553
EP - 576
JO - Atomization and Sprays
JF - Atomization and Sprays
SN - 1044-5110
IS - 6
ER -