Campus Units

Mechanical Engineering

Document Type

Article

Publication Version

Published Version

Publication Date

8-2016

Journal or Book Title

Physical Review Fluids

Volume

1

Issue

4

First Page

043201

DOI

10.1103/PhysRevFluids.1.043201

Abstract

A theoretical model for predicting and interpreting blood-spatter patterns resulting from a gunshot wound is proposed. The physical process generating a backward spatter of blood is linked to the Rayleigh-Taylor instability of blood accelerated toward the surrounding air, allowing the determination of the initial distribution of drop sizes and velocities. Then the motion of many drops in air is considered with governing equations accounting for gravity and air drag. Based on these equations, a numerical solution is obtained. It predicts the atomization process, the trajectories of the back-spatter drops of blood from the wound to the ground, the impact angle, and the impact Weber number on the ground, as well as the distribution and location of bloodstains and their shape and sizes. A parametric study is undertaken to predict patterns of backward blood spatter under realistic conditions corresponding to the experiments conducted in the present work. The results of the model are compared to the experimental data on back spatter generated by a gunshot impacting a blood-impregnated sponge.

Comments

This article is published as Comiskey, P. M., A. L. Yarin, S. Kim, and D. Attinger. "Prediction of blood back spatter from a gunshot in bloodstain pattern analysis." Physical Review Fluids 1, no. 4 (2016): 043201. doi: 10.1103/PhysRevFluids.1.043201. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Share

COinS