Blood is a wonderful and complex substance which contains many chemical compounds to perform various functions. For describing the dynamics of blood flow, the viscoelastic parameters such as viscosity and elasticity, should be obtained from the measurements under oscillatory shear flow.
Viscoelastic materials have interesting properties. They exhibit both viscous behaviour as well as elasticity. When a constant displacement is applied, the stresses of a viscoelastic material gradually relax over time because of these properties. Conversely, under a constant applied force, elastic strains continue to accumulate, deforming further more. Because of this complex behaviour, the use of linear material properties is generally inadequate in accurately determining the final shape of viscoelastic material, the time taken to arrive at that geometry, and the stresses on the part. In these cases, the material's viscoelasticity must be taken into account in the simulation.
This paper presents the data on elastic and acoustic parameters of human blood and its plasma by using the ultrasonic interferometer. The ultrasonic interferometer with multiple frequencies is used to find out the ultrasonic velocity of blood. By knowing the density of blood, elastic constant and acoustic parameters like coefficient of absorption, modulus of elasticity and loss modulus are determined for different frequencies.
Elastic Constant, coefficient of absorption, modulus of elasticity, loss modulus
