Abstract
Platelet diffusivity in flowing blood was measured using data from a deposition experiment on a subendothelial surface in a laminar flow chamber with aid of a theoretical estimation of platelet flux based on Leveque equation. Values of diffusivity range between 0.3 and 3.5×10−7 cm2 sec−1 for shear rates varying between 50 and 550 sec−1 and for a series of hematocrits (20, 40, 60).
A convective-diffusive theory of the enhancement of diffusivity due to red cell rotational motion is then developed to quantitatively analyse the dependence of diffusivity on both shear rate and hematocrit.
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