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Thermodynamics Conceptual Question

  • Thread starter boeing9379
  • Start date
  • #1

Homework Statement



I have a system with air flowing through a ducting with two inlets and one exit operating at steady state. There is no heat transfer or potential energy change. I know the mass flow rates and velocities at all inlets and exits. How would I go about finding the rate of change in kinetic energy for the stream flowing from point 2, an inlet, to point 3, the outlet.

Homework Equations



The Attempt at a Solution



I don't know exactly what the rate of change of kinetic energy between one of the inlets and the exit means, so I don't know where to start.
 

Answers and Replies

  • #2
17
0
Maybe the rate of change in the kinetic energies of the inlets and outlet per minute or second? [tex] K.E. = \frac{1}{2}mv^2[/tex]
 
Last edited:
  • #3
rock.freak667
Homework Helper
6,230
31
Adding to what crims0ned suggested

[tex]\frac{d}{dt}(KE) = \frac{1}{2} \dot{m}v^2[/tex]
 

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