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CFD-Example
3: Quenching in a field of impinging jets
Cylinder, plates and ball bearing ring are quenched in a variable nozzle field. The influence of the nozzle field parameters on the heat transfer coefficient, the hardness, the residual stresses, the distortion and the material structure is investigated. Numerical simulations are applied to optimize the arrangement of the jets.
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Figure 1:
Velocities for a ring configuration in a nozzle field
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Figure
1 shows the flow around a ring configuration. Due to the model symmetry,
the numerically investigated region can be reduced to the shown cut
out.
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Figure
2: Nusselt-Number for cylinder configuration
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Figure
2 shows the dimensionless heat transfer, the Nusselt-Number, for a
cylinder configuration. Everywhere, where a jet impinges onto the surface,
the heat transfer increases. A good agreement between numerical and
experimental data has been achieved (see references below). The numerical
analysis allows to improve the understanding of momentum and heat transfer in the facility. ( click on the images to enlarge) |
Further
information:
U.
Heck, U. Fritsching, K. Bauckhage
Fluid
flow and heat transfer in gas jet quenching of a cylinder, Int. Journal of
Numerical Methods for Heat and Fluid Flow, Vol. 11, p. 36-49, 2001
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B.
Gondersen, U. Heck, T. Lübben, U. Fritsching, F. Hoffmann, K. Bauckhage
Optimierung
der Einzelteilabschreckung im Düsenfeld, Teil 2: Maß- und Formänderung und
numerische Simulation, Härterei-Technische Mitteilungen, Vol. 53, S. 194-198,
1998
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B.
Gondersen, U. Heck, T. Lübben, U. Fritsching, F. Hoffmann, K. Bauckhage
Optimierung
der Einzelteilabschreckung im Düsenfeld, Teil 1: Einfluß der Düsenfeldparameter
auf Abkühlgeschwindigkeit und Oberflächenhärte, Härterei-Technische
Mitteilungen, Vol. 53, S. 87-92, 1998
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