الفهرس 
INTRODUCTION AND AIM OF THE WORKOnly 14 pages are availabe for public view
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Abstract
According to Poiseuille 1 s law, the flow of a liquid
in cylindrical tube is inversely proportional to the
viscosity of this liquid.
Viscosity can be easily defined as the property of
fluid to resist flow. In practice viscosity is defined
as the ratio of shear stress to shear rate.
A simple fluid in which the coefficient of
viscosity is
be Newtonian,
blood is known
constant at all rates of shear is known to
as it obeys the law of Poiseuille. The
to be non Newtonian, as the apparent
viscosity increases at low rates of shear and is reduced
with high shear rates. The non - Newtonian behaviour of
blood is attributed to its multifonn composition, bein~
a suspension of cells , proteins , carbohydrates ,
electrolytes , etc •• in an acquous mediwn, IJorutally, the
plasma viscosity is constant at various n1tes of shear,
plasma is knovm to have a Newtonian viscosity.
The viscosity of blood is knovm to be affected by a
variety of factors, many of which, in addition, are
influenced by each other. The deterrdnants of blood
viscosity are ; the hematocrit value ’ the de13ree of
aggregation of red cells , the internal viscosity of the red cells , and the viscosity of plaGma. Platelets and
white cells normally have little influence on blood
viscosity