Near
Field of a Pulasating Sphere:
-
Fluid is air at ambiant
conditions (c=344 m/s)
-
Frequency is 30 Hz
-
Source diameter is 40
cm. Images are synchronous.
-
Note the particle velocity
waves travel slowly close to the source, in the near field
-
Pressure waves travel
at constant speed, while phase speed of velocity waves is lower
-
Maximum pressure is
blue, and minimum (negative) pressure is red, zero pressure is blue/green
(the B&K color!)
The movie was created
using MATLAB (Registered Trademark).