Blood Splatter

Blood splatter 1. 

Formed by drop dripping vertically on to surface. Smaller splatters are evenly distributed around the blood drop 

Blood splatter 2.

Formed by one drop of blood dripping from high ground. A greater distance from the surface also means that the velocity of the blood drop is higher than in Blood Splatter 1. 

Blood splatter 3.

This is formed by a right to left motion. This can be seen by the larger circle of blood at the right, indicated the initial point of impact. There is a trail of blood to the left of the main drop followed by a smaller circular area of blood.

Blood splatter 4.

Each drop has a large area of blood where it first hit the wall. This large area is then followed by a trail of blood dripping onto the floor. This probably shows that each one was splattered on individually, and not in a smooth continuous movement. Except for the area of the corner of the wall, where the drops there do not have a trail of blood below it. Whoever splattered the blood did it in one action. All this leads to a deliberate and intentional application of blood to the walls and not murder or anything like that. 

Name as many factors that affected the splatters

Velocity, angle of impact, height of impact, direction of impact, texture of surface of impact, amount of blood. 

Hypotheses

The greater the distance between the initial height and surface, the greater the diameter of blood splatter. 

The direction of action causing the blood splatter can be determined by resulting blood splatter. 

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Factors that affect blood splatters.


Surface Tension
The surface tension of blood is not overcome by gravity and air resistance. It is only broken when the blood hits a surface. Different textures of surfaces causes different shapes of blood drops to be made. A hard, smooth, nonporous surface such as clean glass or smooth tile, will create little if any spatter in contrast to a surface with a rough texture such as wood or concrete that can create a significant amount of spatter. Rough surfaces have protuberances that rupture the surface tension of the blood drop and produce spatter and irregularly shaped parent strains with spiny or serrated edges.

Viscosity 


Angle of Impact
When a droplet of blood strikes a horizontal surface at 90o it produces a circular stain. As this angle gets lower, the diameter of blood drop increases. This drop will be enlongated, not a circular stain.

Height of drop
The greater the height of drop, the greater the diameter. A straight drop will generally cause a circular stain, and the diameter of this would increase. Even when the drop is from an angle (as mentioned about, the drop will be englongated), the diameter will increase when there is an increase in height.