A theory of blood flow in small vessels.

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Abstract
The theory is based on the red cells forming a shearing core when flowing in large vessels and an axial train when passing down vessels whose diameter is comparable to the dimensions of the cells. It predicts that blood should exhibit a minimum hematocrit (and probably a minimum apparent viscosity) when flowing in a vessel of a critical diameter. For a 40 percent hematocrit in the feed and red cells whose static diameter is 8 [mu], the critical diameter should be between 7 and 16 [mu] and possibly decreases as the flow rate increases. The theory is used to explain various observed peculiarities of flow in the microcirculation.

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