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
Part of the Fluid Mechanics and Its Applications book series (FMIA, volume 121)


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.



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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