For investigative purposes, the bloodstain pattern analyst might have to estimate if a given stain on fabric could have originated from a specific location. A wide range of values of the maximum distance that a blood drop can travel have been reported based on experiments, ranging from less than 1 m to more than 10 m. It is also known that stains on porous materials such as fabrics are more difficult to interpret than stains on non-absorbing surfaces, because of wicking. Here we perform several fluid dynamic spatter experiments and formulate a fluid dynamics model to describe the trajectories of the blood drops. The experiments are performed with swine blood, the properties of which are well understood. The main parameters screened are the drop size, initial velocity, the launch angle, and the orientation of the fabric. A large number of blood drops are produced by impact or gunshot events. The resulting stains on knitted white T-shirt fabric are digitally measured. Their position relative to the source and size is reported. Trajectories are simulated accounting for the influence of gravity and drag forces. A simple relation between drop size and stain size is established based on extensive experiments on a specific fabric. Results of the trajectory simulations are then searched and mined for parameters directly measurable on a crime scene, such as the stain size on fabric and the relative location of the fabric with respect to the blood source. The experimental results are compared and found in agreement with the numerical predictions. The results are presented in one chart relevant to crime scene reconstruction. The chart is easy to use, and only requires minimum knowledge of fluid dynamics.
This experimental study investigates the parameters controlling the spatial distribution and size distribution of blood spatter stains. An experimental setup consisting of two cylinders colliding along their main axes is used to produce spatter patterns, under conditions where the impact velocity and kinetic energy of the impact are independently controlled. The resulting spatter patterns are scanned and made available as digital images. Characteristic distributions of stain sizes and stain positions, as well as the number of stains, are measured. The influence of the velocity and kinetic energy of the impact, as well as the shape of the impactor, is quantified and interpreted. An energy analysis is performed and provides a criterion based on dimensionless parameters to determine which impact conditions influence the spatter pattern. High-resolution images of the 19 spatter patterns produced during the study are made available in an open-access repository.
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