Blood flow in rigid tubes: thickness and slip velocity of plasma film at the wall.

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Abstract
From flow studies of blood in rigid tubes, it is known that there is axial streaming of the red cells away from the tube wall, leaving a clear plasma film. The work of Hershey and Smolin has shown that blood can be analyzed as a non-Newtonian suspension. Based on this information, flow data on blood flowing in rigid tubes were collected and mathematically treated by the Oldroyd method. From this, the plasma film at wall was analyzed and the thickness, film slip velocity, and slip coefficient were determined. The results found were: the thickness of the plasma film increased rapidly as the flow increased from 0 and approached a limiting value of 0.00181 in. (46.0 [mu]) for he-matocrit 40% and 0.00158 in. (40.2 [mu]) for hematocrit 44.5%; the slip coefficient behaved in a similar manner to that of the film thickness. The limiting values were 5.18 ft3/lb. force-sec and 4.50 ft3/lb. force-sec for hematocrits of 40% and 44.5%, respectively; the effective slip velocity of the film increased monotonically with flow rate and was a linear function of shear stress at high flow rates.

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