LABS - 4A: Energy Loss in Bends Flashcards Preview

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Flashcards in LABS - 4A: Energy Loss in Bends Deck (7)
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1

What does Bernoulli's principle state?

As the speed of a moving fluid increases, the pressure exerted by that fluid decreases.
(Pressure is inversely proportional to fluid velocity).

2

What is the equation for Bernoulli's principle?

p + (ρv²)/2 + ρgh = constant

Where:
p = pressure
ρ = density
v = velocity
h = height/elevation
g = acceleration by gravity

[dynamic and static pressures]

3

What kind of energy losses does a fluid experience in pipework?

Ek transferred and lost as heat energy (due to friction/head loss due to friction)

4

What's head loss?

Energy lost due to resistance to flow.

This can occur due to sudden changes e.g. in pipe diameter

Major loss - loss in pipes and ducts
Minor loss - loss in components e.g. valves

5

What is the loss coefficient, K l?

A ratio of potential to kinetic energies, suggesting any additional energy lost in flow.

6

What do manometers measure?

Pressure

7

What factors affect energy losses in pipes?

Fluid flow velocity
Length of pipe
Width/diameter of pipe
Pipe material (resulting in friction)
Change in direction of fluid flow
Obstacles or obstructions within the pipes
Type of fluid flow (e.g. laminar or turbulent)