Details
| Original language | English |
|---|---|
| Pages (from-to) | 1243-1252 |
| Number of pages | 10 |
| Journal | International Journal of Heat and Technology |
| Volume | 39 |
| Issue number | 4 |
| Publication status | Published - 31 Aug 2021 |
Abstract
The results of numerical simulations of a single impinging round jet, using different numerical parameters are presented. To simulate the heat transfer in industrial drying with arrays of different jets the heat transfer for a single round jet (Re=23000 based on jet's diameter and bulk velocity and the dimensionless jet's outlet to target wall distance= 2) is used as a test case to validate the numerical model. The distribution of the Nusselt-number serves as a benchmark and the computational cost with regard to CPU-time and memory requirements should be minimal. To accurately predict the intensity and position of the secondary peak from an impinging flow, different approaches for turbulence modeling are considered and their results are compared with data from the literature. The influence of the grid size and the grid shape is analyzed and the grid-independent solution is determined. The results using different implementations of the SST k-omega model, as the best compromise between the computational cost and accuracy are compared. Low Re damping modification in the implementation of SST K-ω has an important role in the prediction of the secondary peak. Good results can be achieved with a coarse grid, as long as the boundary region is appropriately resolved. Polyhedral grids produce good quality results with lower memory requirements and cell numbers as well as shorter run times.
Keywords
- CFD, Heat transfer, Jet impingement, Secondary peak, Turbulence modeling
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanical Engineering
- Chemical Engineering(all)
- Fluid Flow and Transfer Processes
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In: International Journal of Heat and Technology, Vol. 39, No. 4, 31.08.2021, p. 1243-1252.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Numerical prediction of the second peak in the nusselt number distribution from an impinging round jet
AU - Chitsazan, Ali
AU - Klepp, Georg
AU - Glasmacher, Birgit
PY - 2021/8/31
Y1 - 2021/8/31
N2 - The results of numerical simulations of a single impinging round jet, using different numerical parameters are presented. To simulate the heat transfer in industrial drying with arrays of different jets the heat transfer for a single round jet (Re=23000 based on jet's diameter and bulk velocity and the dimensionless jet's outlet to target wall distance= 2) is used as a test case to validate the numerical model. The distribution of the Nusselt-number serves as a benchmark and the computational cost with regard to CPU-time and memory requirements should be minimal. To accurately predict the intensity and position of the secondary peak from an impinging flow, different approaches for turbulence modeling are considered and their results are compared with data from the literature. The influence of the grid size and the grid shape is analyzed and the grid-independent solution is determined. The results using different implementations of the SST k-omega model, as the best compromise between the computational cost and accuracy are compared. Low Re damping modification in the implementation of SST K-ω has an important role in the prediction of the secondary peak. Good results can be achieved with a coarse grid, as long as the boundary region is appropriately resolved. Polyhedral grids produce good quality results with lower memory requirements and cell numbers as well as shorter run times.
AB - The results of numerical simulations of a single impinging round jet, using different numerical parameters are presented. To simulate the heat transfer in industrial drying with arrays of different jets the heat transfer for a single round jet (Re=23000 based on jet's diameter and bulk velocity and the dimensionless jet's outlet to target wall distance= 2) is used as a test case to validate the numerical model. The distribution of the Nusselt-number serves as a benchmark and the computational cost with regard to CPU-time and memory requirements should be minimal. To accurately predict the intensity and position of the secondary peak from an impinging flow, different approaches for turbulence modeling are considered and their results are compared with data from the literature. The influence of the grid size and the grid shape is analyzed and the grid-independent solution is determined. The results using different implementations of the SST k-omega model, as the best compromise between the computational cost and accuracy are compared. Low Re damping modification in the implementation of SST K-ω has an important role in the prediction of the secondary peak. Good results can be achieved with a coarse grid, as long as the boundary region is appropriately resolved. Polyhedral grids produce good quality results with lower memory requirements and cell numbers as well as shorter run times.
KW - CFD
KW - Heat transfer
KW - Jet impingement
KW - Secondary peak
KW - Turbulence modeling
UR - http://www.scopus.com/inward/record.url?scp=85116529600&partnerID=8YFLogxK
U2 - 10.18280/ijht.390422
DO - 10.18280/ijht.390422
M3 - Article
AN - SCOPUS:85116529600
VL - 39
SP - 1243
EP - 1252
JO - International Journal of Heat and Technology
JF - International Journal of Heat and Technology
SN - 0392-8764
IS - 4
ER -