Abstract
Plug motion in a horizontal pipe is computed following the first and second reports.
The pressure of air from an compressor which depends on time, and a bend which partially changes the friction forces, have an important effect upon plug motion. These are some of the factors of randomness of the experimental data.
In this report, the pressure fluctuation and the bend are considered. The plug motion depends on the amplitude, the phase of pressure fluctuation, and the shape of the pressure wave.
When the plug moves through the bend, the friction force which partially increased at the bend, translates into the pressure difference between the front and the rear of the plug.
