Figure 4.

Outline of simplified mass transport considerations for oxygen transport to a blood vessel wall. The schematic displays the concentration profile from the bulk blood (C_b) to the endothelial cell surface (C_s) to the inner wall (C_w) and the minimum value (C_min) as indicated in figure 2. k_L is the fluid phase mass transport coefficient, $\dot{Q}$ is the oxygen consumption rate and T is the distance to C_min—roughly ½ the wall thickness. The velocity profile at the left is linearized because of the thin concentration boundary layer (Leveque approximation) [81].