![]() ![]() This is interpreted to reflect the hematocrit-dependent transition from single- to multifile arrangement of cells in flow. While a linear hematocrit-viscosity relationship is found in tubes of or = 9 microns. A pronounced change in the hematocrit dependence of relative viscosity is observed in a range of tube diameters in which viscosity is minimal. Empirical fitting equations predicting relative apparent blood viscosity from tube diameter and hematocrit are presented. If corrected for differences in suspending medium viscosity and temperature, the data show remarkable agreement. The combined data base comprises measurements at high shear rates (u > or = 50 s-1) in tubes with diameters ranging from 3.3 to 1,978 microns at hematocrits of up to 0.9. ![]() Data available from the literature are compiled, and new experimental data obtained in a capillary viscometer are presented. The present study provides a comprehensive data base for the description of relative apparent blood viscosity as a function of tube diameter and hematocrit. Plasma viscosity measures the viscosity of blood fluid with all the cellular. The main factor affecting Whole blood viscosity is the red cells, both their over volume, usually taken as the haematocrit, and their ability to change shape 2. Quantitative descriptions of this effect and of the dependence of blood viscosity on hematocrit in the different diameter tubes are required for the development of hydrodynamic models of blood flow through the microcirculation. Whole blood viscosity measures a sample of blood containing all the fluid and cellular constituents. 96: 562–568, 1931), it has been known that the relative apparent viscosity of blood in tube flow depends on tube diameter. 169: 212–222, 1930) and Fahraeus and Lindqvist (Am. What does blood viscosity mean Information and translations of blood viscosity in the most comprehensive dictionary definitions resource on the web. Since the original publications by Martini et al. ![]()
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