Q&A forum: Pipe Flow Calculator
(gas and liquid)
This is a very simple example about which I have a few queries:
A nylon pipe (spigot) internal dia 7mm, 8cm long - 2.820 KPa static pressure - venting to ambient.
ϵ: surface roughness nylon spigot =0.0015mm=0.0000015m length 8 cm
1. Density isn't used in the Gas calculation. It calculates the inlet density and the outlet density. This is a coding error - it shouldn't be asking for density for the gas calculation because it doesn't use it.
2. Yes it should
3. If you enter the RAM value of 0.0289644, the maximum outlet flow velocity will be about 122. Any other differences in the output velocity will be due to the input values used. RAM, viscosity, pressures, etc.
4. There is. It is the maximum outlet velocity (v̌₂), but only if your input data is in metres [/s]
In other words, PipeFlow's calculations are correct if you do the following:
The calculator has since been modified to remove the requirement for density in the gas calculation
(No relevant questions have been issued for this program to date)