Difference between revisions of "Bernoulli's principle"
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== Explanation == | == Explanation == | ||
| − | Bernoulli's principle states the relation between the velocity of the fluid and the static pressure. As the velocity of the | + | Bernoulli's principle states the relation between the velocity of the fluid and the [[static pressure]], [[dynamic pressure]] and the [[internal energy]]. As the velocity of the fluid increases, the static pressure drops, with a decrease in its [[potential energy]] and simultaneously the [[dynamic pressure]] increases, with an increase in its [[kinetic energy]]. The opposite happens when the velocity decreases. |
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== Frequently Asked Questions == | == Frequently Asked Questions == | ||
=== Is Bernoulli's principle the real reason for the lift in an airfoil? === | === Is Bernoulli's principle the real reason for the lift in an airfoil? === | ||
| − | Yes, the Bernoulli's principle does contribute to the [[lift]] in an airfoil. But the most contributing factor for the lift would be due to Newtonian forces acting on it. However, there is a misconception in using the Bernoulli's principle in incorrect lift theories like the equal transit time theory | + | Yes, the Bernoulli's principle does contribute to the [[lift]] in an airfoil. But the most contributing factor for the lift would be due to Newtonian forces acting on it. However, there is a misconception in using the Bernoulli's principle in incorrect lift theories like the equal transit time theory <ref>https://www.grc.nasa.gov/www/k-12/airplane/wrong1.html</ref>, where it is misunderstood that the air packets that gets separated in the leading edge take equal amount of time to reach the trailing edge. This has been proven wrong by several wind tunnel experiments. |
== References == | == References == | ||
<references/> | <references/> | ||
Latest revision as of 20:21, 8 September 2019
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Contents
Explanationedit
Bernoulli's principle states the relation between the velocity of the fluid and the static pressure, dynamic pressure and the internal energy. As the velocity of the fluid increases, the static pressure drops, with a decrease in its potential energy and simultaneously the dynamic pressure increases, with an increase in its kinetic energy. The opposite happens when the velocity decreases.
Frequently Asked Questionsedit
Is Bernoulli's principle the real reason for the lift in an airfoil?edit
Yes, the Bernoulli's principle does contribute to the lift in an airfoil. But the most contributing factor for the lift would be due to Newtonian forces acting on it. However, there is a misconception in using the Bernoulli's principle in incorrect lift theories like the equal transit time theory [1], where it is misunderstood that the air packets that gets separated in the leading edge take equal amount of time to reach the trailing edge. This has been proven wrong by several wind tunnel experiments.