Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Fluid flow through positive pressure gradient

  1. Jul 25, 2014 #1
    I am a student of 11th standard and being introduced to Bernoulli's principle made me wonder , how does flow takes place in positive pressure gradient (i.e. from low pressure region to high pressure region), in a diffuser or a diverging part of a venturi meter , since we know that flow always takes place from high pressure region to low pressure region ?.
    it will be very kind of you to clear my confusion.
    Thank you.
     
  2. jcsd
  3. Jul 25, 2014 #2

    Baluncore

    User Avatar
    Science Advisor

    The fluid having kinetic energy will decelerate as it climbs the pressure gradient.
     
  4. Jul 25, 2014 #3

    boneh3ad

    User Avatar
    Science Advisor
    Gold Member

    Fluid motion does not always take place in the direction of negative pressure gradient; it always accelerates in that direction. If it already has motion against the pressure gradient, the gradient will serve to retard that motion, this the reason the velocity reduces through a diffuser.
     
  5. Jul 26, 2014 #4
    yes sir i understand that. But can I say that the fluid at the diffuser inlet has enough momentum to overcome the positive pressure gradient and hence the flow. and as the flow occurs the kinetic energy is converted into pressure energy
     
  6. Jul 26, 2014 #5

    boneh3ad

    User Avatar
    Science Advisor
    Gold Member

    Yes. That is essentially what Bernoulli's equation is telling you. It's an energy balance.
     
  7. Nov 4, 2014 #6
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Fluid flow through positive pressure gradient
Loading...