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Adapting of the Background-Oriented Schlieren (BOS) Technique in the Characterization of the Flow Regimes in Thermal Spraying Processes

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Abstract

In thermal spraying technique, the changes in the in-flight particle velocities are considered to be only a function of the drag forces caused by the dominating flow regimes in the spray jet. Therefore, the correct understanding of the aerodynamic phenomena occurred at nozzle out let and at the substrate interface is an important task in the targeted improvement in the nozzle and air-cap design as well as in the spraying process in total. The presented work deals with the adapting of an innovative technique for the flow characterization called background-oriented Schlieren. The flow regimes in twin wire arc spraying (TWAS) and high velocity oxygen fuel (HVOF) were analyzed with this technique. The interfering of the atomization gas flow with the intersected wires causes in case of TWAS process a deformation of the jet shape. It leads also to areas with different aero dynamic forces. The configurations of the outlet air-caps in TWAS effect predominantly the outlet flow characteristics. The ratio between fuel and oxygen determine the dominating flow regimes in the HVOF spraying jet. Enhanced understanding of the aerodynamics at outlet and at the substrate interface could lead to a targeted improvement in thermal spraying processes.

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Acknowledgements

The authors gratefully acknowledge the financial support of the DFG (Deutsche Forschungsgemeinschaft) within the collaborative research Centre SFB708/TP-B3_TP-A1.

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Authors and Affiliations

  1. Dortmund University of Technology, Dortmund, Germany

    W. Tillmann

  2. Dortmund University of Technology, Institute of Materials Engineering, Dortmund, Germany

    M. Abdulgader, H. G. Rademacher, N. Anjami & L. Hagen

Authors
  1. W. Tillmann
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  2. M. Abdulgader
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  3. H. G. Rademacher
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  4. N. Anjami
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  5. L. Hagen
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Corresponding author

Correspondence to M. Abdulgader.

Additional information

This article is an invited paper selected from presentations at the 2013 International Thermal Spray Conference, held May 13-15, 2013, in Busan, South Korea, and has been expanded from the original presentation.

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Tillmann, W., Abdulgader, M., Rademacher, H.G. et al. Adapting of the Background-Oriented Schlieren (BOS) Technique in the Characterization of the Flow Regimes in Thermal Spraying Processes. J Therm Spray Tech 23, 21–30 (2014). https://doi.org/10.1007/s11666-013-0018-5

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