Biomedical Engineering Reference
In-Depth Information
FIGURE 2.24
Figure for Homework
Problem 2.15.
h
M
2.16 What type of fluid can be classified by the following shear stress
strain rate data? Plot the
data and classify. Determine the viscosity of the fluid.
TABLE 2.4
Shear stress (N/m 2 )
0.4
0.82
2.50
5.44
8.80
Shear rate (s 2 1 )
0
10
50
120
200
2.17 A plate is moving upwards through a channel filled with water as shown. The plate veloc-
ity is 10 cm/s, and the spacing is 50 mm on each side of the plate. The force required to
move the plate is equal to 5 N. Determine the surface area of the plate.
FIGURE 2.25
F
Figure for Homework Problem 2.17.
50 mm
50 mm
2.18 Use the same figure for problem 2.17, except that the distance on the right-hand side is
increased to 100 mm. The fluid on the right side is blood. Determine the viscosity of the
fluid on the left side. The plate is moving with a constant velocity.
2.19 Two data points on the rheological diagram of a biofluid are provided. Determine the con-
sistency index and the flow behavior index and the strain rate if the shear stress is increased
to 3 dynes/cm 2 . Assume that this is a two-dimensional flow.
dV
dy 5
15 rad
s
868 dynes
cm 2
; τ 5
0
:
dV
dy 5
30 rad
355 dynes
cm 2
s ; τ 5
0
:
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