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Visualization of High Speed Liquid Jet Impaction on a Moving Surface
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Roughness Influence on Human Blood Drop Spreading and Splashing.

Fiona R Smith1, Naomi C Buntsma1, David Brutin1

  • 1Aix Marseille Université , CNRS, IUSTI, Marseille, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 28, 2017
PubMed
Summary
This summary is machine-generated.

Surface roughness significantly impacts blood droplet splashing during crime scene analysis. This study reveals roughness is more critical than wettability in determining bloodstain patterns, aiding forensic investigations.

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Area of Science:

  • Forensic Science
  • Fluid Dynamics
  • Materials Science

Background:

  • Bloodstain pattern analysis (BPA) is crucial for crime scene reconstruction.
  • Existing research on droplet impact often overlooks non-Newtonian fluids like blood.
  • The influence of surface properties on blood droplet behavior requires further investigation.

Purpose of the Study:

  • To investigate how surface roughness and wettability affect the splashing limit of blood droplets.
  • To understand the role of these surface properties in bloodstain pattern formation.
  • To develop empirical solutions for predicting blood droplet impact outcomes.

Main Methods:

  • High-speed camera recording of blood droplets impacting various surfaces at different velocities.
  • Analysis of droplet impact recordings and surface characteristics (roughness, wettability).
  • Comparison of the influence of roughness versus wettability on splashing behavior.

Main Results:

  • Surface roughness was found to be a major factor in the splashing/non-splashing threshold of blood droplets.
  • Wettability had a lesser impact on the splashing limit compared to roughness.
  • Surface roughness was observed to alter the deformation characteristics of blood drip stains.

Conclusions:

  • Surface roughness is a critical parameter in determining blood droplet impact outcomes in forensic analysis.
  • Understanding the interplay between surface roughness and blood droplet dynamics enhances the interpretation of BPA evidence.
  • These findings contribute to more accurate crime scene reconstruction by characterizing drip stains based on impact conditions.