Calculating Change in Flow for P1 & D1

AI Thread Summary
To calculate the change in flow (Q) when pressure (P1) or pipe diameter (D1) changes, the affinity laws can be applied. The Hagen-Poiseuille equation is recommended for determining flow rates under laminar conditions. This equation relates flow rate to pressure and diameter, allowing for adjustments based on changes in these parameters. It is important to assume that the pipe material remains constant throughout the calculations. Understanding these principles is essential for accurate flow analysis in fluid dynamics.
viadanasi
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If I have a flow , Q1 l/sec and a pressure P1 Bar , Pipe Diameter D1
how can I work out the change in flow if either/or both the Pressure
or Pipe Diameter change. Assuming laminar flow and pipe material
do not change.

Thanks
 
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Welcome to PF!

Start with the affinity laws:
http://www.engineeringtoolbox.com/affinity-laws-d_408.html
 
viadanasi said:
If I have a flow , Q1 l/sec and a pressure P1 Bar , Pipe Diameter D1

how can I work out the change in flow if either/or both the Pressure

or Pipe Diameter change. Assuming laminar flow and pipe material

do not change.
Thanks
Use Hagen poiseulle equation

Chet
 

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