By C. M. Rodkiewicz (eds.)
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A brief survey of the operating principles and main characteristics of usual viscometers will follow. 3 Viscometry Steady measurements of blood rheological properties concern mainly its shear viscosity. Two types of viscometers are currently used, capillary (tube) viscometers and rotational viscometers. A. Tube viscometers Fluid flows down a tube from a reservo~r. 1). Onerecords the time interval during which a fixed volume of fluid flows through the tube under a given pressure gradient P = ~p/L.
Apparent relative viscosity shear rate = where np H and the applied is : = ( 3. 1 ) is the plasma viscosity. 2) that is (i) as for any suspension, blood viscosity increases when volume fractiongrows and (ii) blood is a non-newtonian (shear-thinning) fluid. Eq. 1) for local values of the relative viscosity nr nr(H , yr) under steady conditions. The present section 1s devoted to the analysis of concentration effects on blood viscosity at fixed applied shear rate, nr = nr(H) especially at very low or very high shear rates when the suspension behaves as a newtonian fluid.
635 (LANDEL et al, 1965). 8) to the form n = ( 1 - K "( 4> )- 2 · 5 , where '! 5). and K a "packing coefficient or a coefficient of fluid D. Quemada 48 immobilization". e. 5 The validity of eq. 29) has been tested by DINTENFASS. However, this proof is only qualitative as it results from superposing calculated and experimental curves given by DINTENFASS (Fig. 8 in DINTENFASS, 1968 , as an example). Coming back to the data for hardened cells shown on Fig. 28). CP) (1\) _, . ll ( g/'OOnt) 4 3 2 cprden (g/ 0 2 Fig.