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Using Freese's hemodynamic model, we calculated the speed and pressure distribution in the villi-free area of the cotyledon. The Navier-Stokes equation was converted approximately into Reynod factors. The villi-free area was described as circular diffusor. On the basis of our computations, we assume that a predominately laminar flow occurred in the intervillous space; we considered an angular apearature of between 10 and 40 degrees to be physiological. In this area, pressure distribution is homogenous. The model-theoretical considerations presented here substantiate Freese's conception.
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