How to use Bernoulli's Equation Correctly?

  • Thread starter xian_kgx
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  • #1
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One large pipe is splitted into 2 smaller pipes. Can we use Bernoulli's equation and say that the total head at a point in the large pipe is equal to a point at one of the 2 smaller pipes? Why is energy not conserved?
 

Answers and Replies

  • #2
FredGarvin
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There are 3 main assumptions in the derivation of the Bernoulli equation. What are they?
 
  • #3
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energy not conserved cuase of the losses-
as long as there is a flow then there is a difference in energy-which cuased the flow to occur-
there is the primary losses(friction)and the secondry(valve,bend-)which u don have here--
if u could show ur pipe system-it would be more clear for us-
wish i could help
 
  • #4
Hi Fred,

Good hints. Check my answers and let me know if I got all of them! :smile:
FredGarvin said:
There are 3 main assumptions in the derivation of the Bernoulli equation. What are they?

1) Constant mass flow rate (no surges).
2) Frictionless (no heat transfer).
3) Irrotational (translational velocity only).

How'd I do?
Rainman
 
  • #5
FredGarvin
Science Advisor
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They are:
- Incompressible
- Inviscous
- Steady State
Since it also is applied along the streamline, so the irrotational part holds too.
A+ for Rainman

As for the main post, energy will not be conserved because of the losses due to friction. Also, you do not state the fluid involved. If it is a liquid, then the incompressibility assumption is pretty much valid. If it is a gas, you need to be concerned with it.
 

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