Platelet gaps, plasma velocity, and porosity in a hemostatic plug. (A) The relationship of minimum gap size to mean intrathrombus plasma velocity. (B) The relationship between minimum gap size and the Peclet number shows that intrathrombus transport is dominated by diffusion. (C) The average velocity in a hemostatic thrombus increases linearly with the inlet velocity (slope = 0.28), but even when the velocity is quadrupled the velocity between platelets is still in the μm/s range.