Biomedical Engineering Reference
In-Depth Information
near the ball is essentially zero until the fourth frame in the series. As one
would expect, the topology of the iso-pressure lines largely matches those of
the velocity lines. At the flow develops, a high pressure zone builds around the
front of the ball.
Figure 32 shows the calculated velocity of the ball as a function of its
position in the barrel.
70
60
50
40
30
20
Analytical
CFD
10
0
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
Position (m)
Reproduced with permission. Copyright retained by Inderscience Publishers.
Figure 32. Velocity as a Function of Distance from the CFD Calculations.
Experimental Verification
The analytical and numerical results are based on the gun shown in Figure
33. It is made from a 10-feet (3.05m) section of 1 ½ in, schedule 40 PVC pipe
of the type often used for plumbing in houses. The gun is supported by flat end
plates and two other blocks along the barrel - a necessity since the PVC tube
is flexible and cannot support its own weight without sagging.
Reproduced with permission. Copyright retained by Inderscience Publishers.
Figure 33. Gun Barrel with Optical Sensors.
