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On the Measurement of Velocity Field Within Wall-Film During Droplet Impact on It Using High-Speed Micro-PIV

  • Visakh VaikuntanathanEmail author
  • Ronan Bernard
  • Grazia Lamanna
  • Gianpietro Elvio Cossali
  • Bernhard Weigand
Conference paper
  • 80 Downloads
Part of the Fluid Mechanics and Its Applications book series (FMIA, volume 121)

Abstract

The relationship between ‘microscopic’ velocity field and ‘macroscopic’ outcomes of liquid droplet impact on wall-films is not yet fully understood. This article reports a preliminary experimental investigation to measure the velocity field within wall-film when a droplet impacts on it, using micro-Particle Image Velocimetry (μ-PIV). The challenges associated with measuring the velocity field within the wall-film are outlined. In this context, the limitations of the traditional μ-PIV technique are discussed, leading to the adoption of high-speed μ-PIV as the suitable technique for measuring the spatio-temporal evolution of velocity within wall-film. The salient features of the high-speed μ-PIV set-up are discussed. Further, results from preliminary experimental investigations on water droplet impacting on water wall-film at moderate impact velocities are presented. It is seen that the current high-speed μ-PIV set-up can be used to obtain reliable measurements of in-plane radial velocity, V, at ‘intermediate’ values of radial, r, and temporal, t, coordinates. Within the measurement range of the current set-up, it is observed that V scales with r and t as Vr/t, which is similar to that reported in literature based on analytical considerations. The limitations of the current set-up, and the requirements for further experiments and validation are highlighted.

Notes

Acknowledgements

The authors gratefully acknowledge the financial support of the Deutsche Forschungs-gemeinschaft (DFG) within the framework of the international research training group “Droplet Interaction Technologies”—DROPIT (GRK2160/1).

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Visakh Vaikuntanathan
    • 1
    Email author
  • Ronan Bernard
    • 1
  • Grazia Lamanna
    • 1
  • Gianpietro Elvio Cossali
    • 2
  • Bernhard Weigand
    • 1
  1. 1.Institute of Aerospace Thermodynamics (ITLR), University of StuttgartStuttgartGermany
  2. 2.Department of Engineering and Applied SciencesUniversity of BergamoDalmineItaly

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