Flow and pressure calculation
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This post was last edited by *aodouzi on 2016-11-15 at 15:57. For a DN50 pipe with a pressure of 0.3 Mpa and a flow rate of 10 m3/h, what is the flow rate when the pressure rises to 0.6 Mpa while the outlet pressure remains at 0.1 Mpa? ? ? ?
I’m not sure; the flow velocity of the fluid in the pipe is related to the pressure difference and the cross-sectional area.
First, calculate the flow velocity of a DN50 pipe at an inlet pressure of 0.6 MPA and an outlet pressure of 0.1 MPA, and then calculate the flow rate
This is basic knowledge of chemical engineering principles; calculate it by yourself
I look forward to your advice. . . . . . . .
Regarding this question: 1. For incompressible fluids, the flow velocity decreases while the flow rate remains constant； 2. For compressible fluids, the mass flow rate remains constant while the volume flow rate increases. For your reference
p1v1/t1=p2v2/t2
I've also been looking for a similar quick-reference table, but I haven't found one. Experimental measurement is likely required. It is proportional to the pressure difference between the inlet and outlet of the pipe, and it is also related to the pipe length and resistance; these factors can be ignored in normal estimates. Such a table is used for estimation in practical operations, but cannot be used for design purposes.
It is estimated to be around 25 m³/h, based on empirical values.