1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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 a pipe - Conservation of mass and/or momentum?

  1. Feb 11, 2013 #1
    1. The problem statement, all variables and given/known data
    56F5pC2.png

    3. The attempt at a solution
    altOjku.jpg

    So first I found the density of the air coming in and going out. Next I used conservation of momentum with two forces caused by the pressures at the entrance and the exit of the nozzle.

    I end up getting 1004 which is not the same as 1060. If I just use conservation of mass so ρVAout=ρVAin I get exactly 1060. So why is it that conservation of momentum does not work in this scenario?
     
  2. jcsd
  3. Feb 11, 2013 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    The nozzle is accelerating the flow of the fluid through the restriction. The mass flow into the nozzle is the same as the mass flow out, but the velocity has increased while the density decreases.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Fluid flow through a pipe - Conservation of mass and/or momentum?
  1. Fluid Flow in a pipe (Replies: 3)

Loading...