Spreading and drying of human blood pools

The drying of whole human blood pools was studied under controlled humidity and imposed temperature conditions in a laboratory glove box. A blood pool represents an accumulation of blood on a substrate, and here blood is assimilated to a complex fluid made of several bio-colloids. We performed experiments at temperatures of 21 °C, 29 °C, and 37 °C, and relative humidity ranging from 20 % to 70 %. The air inside the glove box was still, and the evaporation process was mainly purely diffusive. A human blood diffusion coefficient of (1.08±0.02)×10^-9 m²/s was obtained. Moreover, we elaborated an updated model using Page's model to describe the drying kinetics of human blood pools. The effect of the surface area of pools was considered using a diffusive characteristics time. The drying of human whole blood pools has been studied experimentally to improve the understanding of drops and pools of whole human blood. These findings are of interest for biomedical and forensic applications.