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Influence of the impact energy on the pattern of blood drip stains

F. R. Smith1,*, C. Nicloux2, and D. Brutin1,3,†

  • 1IUSTI, UMR No. 7343, Aix-Marseille University, 13013 Marseille, France
  • 2Institut de Recherche Criminelle de la Gendarmerie Nationale, 95300 Pontoise, France
  • 3Institut Universitaire de France, 75231 Paris, France

  • *fiona.smith@univ-amu.fr
  • †david.brutin@univ-amu.fr
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Phys. Rev. Fluids 3, 013601 – Published 11 January, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.013601

Abstract

The maximum spreading diameter of complex fluid droplets has been extensively studied and explained by numerous physical models. This research focuses therefore on a different aspect, the bulging outer rim observed after evaporation on the final dried pattern of blood droplets. A correlation is found between the inner diameter, the maximum outer diameter, and the impact speed. This shows how the drying mechanism of a blood drip stain is influenced by the impact energy, which induces a larger spreading diameter and thus a different redistribution of red blood cells inside the droplet. An empirical relation is established between the final dried pattern of a passive bloodstain and its impact speed, yielding a possible forensic application. Indeed, being able to relate accurately the energy of the drop with its final pattern would give a clue to investigators, as currently no such simple and accurate tool exists.

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Phys. Rev. Fluids 3, 013601– Published 11 January, 2018
  • Received 20 September 2017
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