Pattern formation in drying drops of blood

Brutin, David; Sobac, Benjamin; Loquet, Boris; Sampol, José

doi:10.1017/s0022112010005070

Cited by 342 publications

(306 citation statements)

References 7 publications

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“…Importantly, the patterns associated with gunshots that are the topic of this work involve stains, the shape of which mainly depends on deformations during impact. As such, those blood patterns are different from blood drop patterns from sessile drops recently studied [42,43], where the shape and structure of stains were mostly caused by slow deformations associated with wetting and drying. Note also that the proposed theory of blood drop motion in air allows for a reverse calculation aimed at establishing the spatter origin based on the stain distribution on the surface.…”

Section: Discussionmentioning

confidence: 70%

Prediction of blood back spatter from a gunshot in bloodstain pattern analysis

et al. 2016

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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. 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.

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Section: Discussionmentioning

confidence: 70%

Prediction of blood back spatter from a gunshot in bloodstain pattern analysis

et al. 2016

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“…Desiccation patterns in the dried sessile drop of whole human blood are significantly different from those of blood plasma without cellular components [47,48]. Patterns in the blood droplet from healthy adults drying on the glass substrates are comprised of three distinguished zones with different characteristic cracking patterns, as displayed in Figure 4.…”

Section: Sessile Drops Of Whole Bloodmentioning

confidence: 99%

Wetting and Drying of Colloidal Droplets: Physics and Pattern Formation

Chen¹,

Zhang²,

Zang³

et al. 2016

Advances in Colloid Science

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When a colloidal droplet is deposited on a solid substrate at ambient condition, it will experience the processes of wetting and drying spontaneously. These ostensibly simple and ubiquitous processes involve numerous physics: droplet spreading and wetting, three-phase contact line motion, flow fields inside droplets, and mass transportation within droplets during drying. Meanwhile, the continuous evaporation of liquid produces inter-and/or intra-molecular interactions among suspended materials and builds up the internal stress within droplets. After drying, interesting and complex desiccation patterns form in the dried droplets. These desiccation patterns are believed to have wide applications, e.g., medical diagnosis. However, many potential applications are limited by the current understanding of wetting and drying of colloidal droplets. This chapter focuses on the complex physics associated with these processes and the pattern formation in the dried colloidal droplets. Moreover, potential applications of these desiccation patterns and prospective works of wetting and drying of the colloidal droplets are outlined in this chapter.

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“…During this stage both the gelation and drying front propagate towards the centre of the stain. -(IV) Once the gelation front reaches the centre of the stain, the entire stain has gelled and evaporation of fluid is mainly driven by the porous media drying dynamics [71]. The drying front and cracks propagate towards the middle of the stain.…”

Section: Pool Of Bloodmentioning

confidence: 99%

Drying colloidal systems: Laboratory models for a wide range of applications

et al. 2018

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Abstract. The drying of complex fluids provides a powerful insight into phenomena that take place on time and length scales not normally accessible. An important feature of complex fluids, colloidal dispersions and polymer solutions is their high sensitivity to weak external actions. Thus, the drying of complex fluids involves a large number of physical and chemical processes. The scope of this review is the capacity to tune such systems to reproduce and explore specific properties in a physics laboratory. A wide variety of systems are presented, ranging from functional coatings, food science, cosmetology, medical diagnostics and forensics to geophysics and art.

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Pattern formation in drying drops of blood

Cited by 342 publications

References 7 publications

Prediction of blood back spatter from a gunshot in bloodstain pattern analysis

Prediction of blood back spatter from a gunshot in bloodstain pattern analysis

Wetting and Drying of Colloidal Droplets: Physics and Pattern Formation

Drying colloidal systems: Laboratory models for a wide range of applications

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