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Determining the furthest distance travelled horizontally by impact spatter blood drop

Liew, Gareth (2017) Determining the furthest distance travelled horizontally by impact spatter blood drop. Masters by Coursework thesis, Murdoch University.

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Abstract

Violent crimes often result in blood-shed events associated with blood spatter. Bloodstain pattern analysis (BPA) serves as a good tool and effective approach to reconstruct the events that occur in a crime scene. Among other bloodstain patterns, impact spatter patterns are commonly found at crime scenes. An impact pattern is formed as a result of an impact force striking an exposed blood source and can be described as a radiating pattern of small individual drops. In most cases of BPA, the reconstruction of the events taken place involve investigating the blood drop flight dynamics and the mechanics of impact spatter generation to determine the origin of the impact. Thus, the discipline of Fluid Dynamics (FD) is also involved in most BPA cases. However, in the cases of multiple impact spatter generation events within a crime scene, it complicates the interpretation and analysis of the impact spatter pattern.

There are many variables of blood drop flight dynamics and mechanisms of impact spatter generation in which a blood drop is exposed to and generated from. The variables of blood drop flight dynamics such as drop deformations/oscillations, breakup, diameter with respect to velocity and air/wind currents do affect a drop while in flight which may alter the trajectory curvature of a blood drop. However, it is relatively unknown in scientific literature how the variables of impact spatter generation setup such as the height of the blood source and impact force applied would affect the horizontal distance travelled by a blood drop generated from an impact spatter. Theoretically, there is also limited literature with regards to the correlation of blood drop flight dynamics to maximum horizontal distance travelled by blood drop. This literature review aims to address the effect of blood drop flight dynamics and the mechanisms of impact spatter generation setup have on the maximum horizontal distance travelled by a blood drop. The purpose of this literature review is to dictate parameters for potential research that may aid in answering the investigative question.

Publication Type: Thesis (Masters by Coursework)
Murdoch Affiliation: School of Veterinary and Life Sciences
Supervisor: Speers, James
URI: http://researchrepository.murdoch.edu.au/id/eprint/39824
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