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Bernoulli's Principle

 
2.6  Bernoulli's Principle
 
  Bernoulli's principle  
  In a steady flow of a fluid, fluid pressure decreases as fluid velocity increases and vice versa.  
     
 
 
 

Application of Bernoulli's principle
  1. Insecticide sprayers
    • The piston is pushed in, high air velocity on nozzle
    • The air pressure in the nozzle is lower than atmospheric pressure
    • Atmospheric pressure acts on the surface of the insecticide
    • Insecticide moves up through the tube

       
  2. Bunsen burner
    • Gas flowing at high velocity, resulting in a lower pressure inside than atmospheric pressure
    • Air from outside is drawn in, mixed with gas
    • Gas and air mixture enables the burning of gas

       
  3. Plane wing (aerofoil)
    • Air moves at higher velocity over the wing, resulting in lower pressure
    • Air moves slower under the wings, resulting in a higher pressure
    • Pressure below wing is higher than the pressure at the top
    • Resultant force acting upwards (lift)

       
  4. Car spoiler ( inverted aerofoil)
    • Air moves at lower velocity over the wing, resulting in higher pressure
    • Air moves faster under the wings, resulting in a lower pressure
    • Pressure below wing is lower than the pressure at the top
    • Resultant force acting downwards
 
The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of Pandai.
Chapter : Pressure
Topic : Bernoulli Principle
Form 5 Physics
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