Hydraulic - flow inside a pipe, how to know the direction?

[amrfd]

hydraulic -- flow inside a pipe, how to know the direction?

if you have a flow inside a pipe, how to know the direction?

 

[tiny-tim]

welcome to pf!

hi amrfd! welcome to pf!

google "non invasive flow monitor"

(i think they all use the doppler effect)​

 

[amrfd]

hi amrfd! welcome to pf!

google "non invasive flow monitor"

(i think they all use the doppler effect)​

thank you for your reply but what do you mean with doppler effect?

 

[tiny-tim]

they bounce ultrasound off the water, and measure the change in frequency of the sound …

do that google search, and you'll find out how ​

 

[amrfd]

thank you very much
if i don't have this device,is there another way to know the direction of flow?

 

[tiny-tim]

i doubt there's anything cheaper

(that doesn't involve cutting a hole in the pipe)

 

[xexorz]

Are you asking from a practical perspective or just for information?

There should be a drop in pressure the further from the source you go (as long as there is flow).

Could also cause local turbulence in the line with a small "wall" and put sensors behind and in front of the wall. The wall is causing the turbulence - would see pressure differential as long as there is flow. Think about an airplane wing and pressure differential top to bottom - only sideways :)

(I'm no expert - but this is a fun thought experiment!)