DEPENDENCE OF THE VISCOSITY ON THE CONCENTRATION OF PARTICLES BY THE EXAMPLE OF BLOOD AND ERYTHROCYTIC SUSPENSIONSZ. P. Shul'man and I. V. Yamaikina UDC 532.529+527 A model of the dependence of the relative viscosity of blood and suspensions of erythrocytes on their volume concentration is proposed. Both parameters of the model correlate differently with each other in three regions of erythrocyte concentrations (for man: Hct < 0.3, Hct = 0.3-0.7, Hct > 0.7). They change abruptly when going through the boundaries of the regions. It is suggested that one of them reflects the intensity of interaction of particles in a suspension and the other is related to the effective radius of hydrodynamic resistance. The model adequately describes the experimental data on the rheology of protein solutions and other suspensions. A. V. Luikov Heat and Mass Transfer Institute, Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 3, pp. 165-168, May-June, 2003. Original article submitted October 16, 2002.