- #1
John Laud
- 2
- 0
Is nothing of the Bernoulli effect due to friction? Passing fluid trying to lift away a slower interface?
Bernoulli Effect & Friction: Lift Away Slower Interfaces?
In summary, the conversation discusses the application of the Bernoulli effect to non-viscous flow, with a focus on friction and viscosity. The Bernoulli effect is not applicable to viscous flow, and the conversation also mentions the use of Bernoulli pressure sensors and measurement of bubble size variation in a venturi. The speaker, John, also expresses his struggle with understanding Bernoulli and lift in the physical universe.
- #2
tiny-tim
Science Advisor
Homework Helper
- 25,839
- 258
Welcome to PF!
Hi John! Welcome to PF!
"Friction" in fluids is viscosity (the difference being that friction involves one material leaving the other material behind, while viscosity involves one material dragging some of the other material along with it).
The Bernoulli effect (or Bernoulli's equation or the Bernoulli principle) applies only to non-viscous flow …
see eg http://en.wikipedia.org/wiki/Bernoulli_effect
Hi John! Welcome to PF!
John Laud said:
"Friction" in fluids is viscosity (the difference being that friction involves one material leaving the other material behind, while viscosity involves one material dragging some of the other material along with it).
The Bernoulli effect (or Bernoulli's equation or the Bernoulli principle) applies only to non-viscous flow …
see eg http://en.wikipedia.org/wiki/Bernoulli_effect
- #3
John Laud
- 2
- 0
Thank you, tiny-tim, for doing my home work. And I struggled through the link you provided.
OK, no friction because wrong word, and no viscous effects because not allowed. So, what sort of Bernoulli pressure sensor doesn't have viscous contamination exactly at its business end?
Can anybody give a link to a report of measurement of bubble size variation as the bubbles pass through a venturi? A YouTube video would be even better.
Another guy staggered by Bernoulli and lift among other aspects of the physical universe - John
OK, no friction because wrong word, and no viscous effects because not allowed. So, what sort of Bernoulli pressure sensor doesn't have viscous contamination exactly at its business end?
Can anybody give a link to a report of measurement of bubble size variation as the bubbles pass through a venturi? A YouTube video would be even better.
Another guy staggered by Bernoulli and lift among other aspects of the physical universe - John
FAQ: Bernoulli Effect & Friction: Lift Away Slower Interfaces?
What is the Bernoulli Effect?
The Bernoulli Effect, also known as Bernoulli's principle, is a physical principle that describes the relationship between fluid velocity and pressure. It states that as the velocity of a fluid increases, the pressure decreases, and vice versa.
How does the Bernoulli Effect apply to lift?
The Bernoulli Effect is a key factor in explaining lift in aerodynamics. When air flows over a curved surface, such as an airplane wing, the air on the top of the curve has to travel a greater distance in the same amount of time as the air on the bottom. This results in the air on top having a higher velocity and lower pressure, creating lift.
How does friction affect the Bernoulli Effect?
Friction plays a role in slowing down the air flow over a curved surface, which can decrease the velocity and disrupt the Bernoulli Effect. This can lead to a decrease in lift and affect the overall performance of an aircraft.
Can the Bernoulli Effect explain all types of lift?
No, the Bernoulli Effect is just one of several factors that contribute to lift. Other factors such as angle of attack, airfoil shape, and wing size also play a role in generating lift.
How does the Bernoulli Effect impact different types of interfaces?
The Bernoulli Effect can apply to various types of interfaces, including air-water interfaces, liquid-liquid interfaces, and solid-liquid interfaces. In each case, the Bernoulli Effect can play a role in determining the behavior of the fluids at the interface, such as the formation of vortices or the creation of waves.