Measurement of Flow Properties of Mammalian Blood with Different Hematocrit Values Using Falling Needle Rheometer
Takamasa Suzuki, Sadao Araki, Hideki Yamamoto, Kimito Kawamura, Hiroko Aida, Dominik Bernitzky, Roberto Plasenzotti
The development of viscometry with high accuracy and
quick operation, as well as the establishment of a data
evaluation method by pathology are largely required.
Especially, the flow properties of human blood are an
important factor in the evaluation of blood disease on the
medicine, but the method of viscometry and the data
collection are not so easy. This study has been described on
the viscosity measurement and their evaluations for
mammalian blood (rabbit, pig and horse) including human
blood. A compact-sized falling needle rheometer (FNR) and
a flow analysis method using this device for blood have
been developed, and the relationship between the apparent
viscosity and physical properties (density, hematocrit value)
of blood have also been evaluated. Measured flow
properties of blood are evaluated as a flow curve showing
the relationship between the shear stress and shear rate.
Observed flow curves of mammalian bloods show three
typical fluid regions, these are, the Non-newtonian fluid
region for a low shear rate range, the transition region and
the Newtonian fluid region for a high shear rate range. Flow
properties of blood in the Casson fluid region and the
apparent viscosity (µ) in the Newtonian fluid region are
measured, and they are compared between mammals. Full Text
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