Pipe Flow Calculations Forum

Reynolds number calculator is from now available for Android smart phones. Calculator is created on the basis of well established Reynolds number calculator for desktop users. It is designed for simple and quick calculation of Reynolds number based on known diameter, flow stream velocity (volume or ...

What is flow rate?
Is pipe filled with water or is it filled just for some level?

It depends on velocity that you use with K value. If you calculate minor loss as Dp = K rho * v^2 / 2 and use velocity on D1 than you should use K1, and for D2 - K2.

Pressure is dropping not only due to change in pipe diameter but also due to local reistance losses in restriction and friction in pipe. In Bernolli equation flow is considered with no energy loss, but in real system it is not the case. Because of that you must add parts of equation that takes care ...

Air in pressurized cylinder is heated due to compression, but while going through restriction it is cooled due to sudden drop in pressure.

On the other hand I don't know how did you get K=10000? It is well known that for pipe entrance K=0.5 and for pipe exit K=1.0 for pipes with sharp edges. As the pipe length is very small, flow can be considered as adiabatic as there is not enough time to exchange heat with surroundings. That high sp...

what you are measuring is actualy pressure difference in front and after 1 mm orifice - am I right? So with discharge calculator you can calculate how much air is flowing through discharge orifice. I here show my results for 5 bar pressure drop over 1 mm pipe with 6 mm length and K = 1.5 for entranc...

You must know how "quickly" it is in order to calculate flow rate of air required and pipe diameter needed for it. When you know time t that is needed to drop temperate from one point to another you can calculate how much volume ( V ) is changing in that time and from there you have flow r...

dan-g wrote: ΔP=f(L/D)((ρv^2)/2)

+ ((ρv^2)/2) due to pipe exit. Correct formula it is!

How is you system looking? Do you have one point where two pipes start and air exits to atmosphere? If so than you have two parallel lines with same pressure drop (pressure change) from the start to the finish and for that equal pressure difference two flow rates are established - which you can use ...