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Physical Characteristics of Spatter Stains on Textiles: Influence of Impact Surface Texture, Blood Drop Volume and Blood Drop Velocity

NCJ Number
304760
Author(s)
Tiegang Fang
Date Published
2022
Length
27 pages
Annotation

This is the Final Research Report for a project with the goal of producing a ‘‘detailed, fundamental understanding of the physics and dynamics of airborne blood as it impacts textile surfaces during the creation of bloodstains, particularly for blood droplets with diameters ranging from a few hundred microns up to four millimeters that represent the case of impact spatter formation.”

Abstract

The project involved the performance of three tasks: 1) the creation and characterization of target textile surfaces with complex structure; 2) the investigation and analysis of blood droplet impact dynamics on textile surfaces; and 3) the investigation and analysis of blood droplet wicking dynamics and the resultant bloodstains on textile surfaces. Project findings are presented under the following five topics: 1) blood drop impact and wicking dynamics – the influence of impact velocity; 2) blood drop impact and wicking dynamics – the influence of fabric type; 3) blood drop impact and wicking dynamics – influence of surface inclination; 4) single micro blood drop generation and impact dynamics; and 5) bloodstains formed on fabrics. The project constructed a multiscale imaging system for bloodstain pattern analysis (BPA); produced high-speed videos of the blood-drop impacting process and resulting bloodstains; and constructed and tested a customized, piezoelectric single blood droplet generation system. 11 figures and 14 references

 

 

Date Published: January 1, 2022