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Experimental and Numerical Investigation of Impinging Jet Flow in Square Ducts Intersecting at 90 degrees.

DE2004822274

Publication Date	2003
Personal Author	Corson, D.; Vassallo, P.
Page Count	54
Abstract	An experimental and numerical investigation has been conducted on flow through two square ducts with a 2:1 hydraulic diameter ratio joined at a right angle. Measurements of the velocity field were acquired using a laser Doppler velocimeter at various planar locations throughout the ducts at a nominal Reynolds number of 68,000. Pressure drop measurements were taken for 3 Reynolds numbers between 46,000 and 93,000. Computational fluid dynamics (CFD) analyses were performed using STAR-CD to determine how well the experimental data could be predicted using the k-(var-epsilon), k-(var-epsilon) RNG, k-(var-epsilon)Chen, k-(var-epsilon) quadratic, k-(omega), and Spalart-Allmaras models. The results show that there are distinct differences in the CDF results. The standard k-(var-epsilon) model overpredicted the loss coefficient by 4% and underpredicted the exit swirl magnitude by 43%. The best predictor of the swirl decay was found to be the k-(omega) model, which adequately followed the data throughout the entire geometry and underpredicted the exit swirl by 16%. The best overall model was found to be Spalart-Allmaras, which overpredicted the loss coefficient by 2% and underpredicted the exit swirl magnitude by 40%.
Keywords	Decay Ducts Hydraulics Velocimeters Fermilab collider detector Geometry Computational fluid dynamics Reynolds number Velocity Pressure drop
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lockheed Martin Electronics Labs., Syracuse, NY.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200417

Experimental and Numerical Investigation of Impinging Jet Flow in Square Ducts Intersecting at 90 degrees.

Experimental and Numerical Investigation of Impinging Jet Flow in Square Ducts Intersecting at 90 degrees.
DE2004822274

Publication Date	2003
Personal Author	Corson, D.; Vassallo, P.
Page Count	54
Abstract	An experimental and numerical investigation has been conducted on flow through two square ducts with a 2:1 hydraulic diameter ratio joined at a right angle. Measurements of the velocity field were acquired using a laser Doppler velocimeter at various planar locations throughout the ducts at a nominal Reynolds number of 68,000. Pressure drop measurements were taken for 3 Reynolds numbers between 46,000 and 93,000. Computational fluid dynamics (CFD) analyses were performed using STAR-CD to determine how well the experimental data could be predicted using the k-(var-epsilon), k-(var-epsilon) RNG, k-(var-epsilon)Chen, k-(var-epsilon) quadratic, k-(omega), and Spalart-Allmaras models. The results show that there are distinct differences in the CDF results. The standard k-(var-epsilon) model overpredicted the loss coefficient by 4% and underpredicted the exit swirl magnitude by 43%. The best predictor of the swirl decay was found to be the k-(omega) model, which adequately followed the data throughout the entire geometry and underpredicted the exit swirl by 16%. The best overall model was found to be Spalart-Allmaras, which overpredicted the loss coefficient by 2% and underpredicted the exit swirl magnitude by 40%.
Keywords	Decay Ducts Hydraulics Velocimeters Fermilab collider detector Geometry Computational fluid dynamics Reynolds number Velocity Pressure drop
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lockheed Martin Electronics Labs., Syracuse, NY.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200417