izitbrokeyet?
Well-Known Member
- Joined
- Apr 5, 2003
- Messages
- 1,908
Rod,
I gave you a chance to correct yourself, but it appears you're not.
Rod G. You are wrong on several different levels regarding this thread. Firstly; you are wrong about the facts you claim to be proficient in. It appears you would rather baffle people with what you don't know???....or maybe you just didn't know better???
Pardon any perceived tone as I correct you regarding the facts.
Acceleration of a fluid is caused by pressure gradients. A fluid is accelerated in direction of the velocity if the pressure goes down. Thus a decrease of pressure is the cause of a higher velocity. It is wrong to say that a lower pressure is caused by a higher velocity.
Bernoulli's Law:
Unfortunately Rods version of Bernoulli and the example was done erroneously, e.g the spoon in the stream of water cannot be used as examples of Bernoulli's law because the static pressure in a free jet stream is equal to the static pressure in the environment regardless of the streaming velocity of the jet. Water can be considered an incompressible fluid, thus it will be at constant pressure (atmosphere pressure). Bernoulli does NOT work without pressure differential or the closed loop.
Coanda Effect:
The flow near limiting surfaces follows the geometrical shape of these surfaces. This behavior is called Coanda effect and is synonymous with Boundary Layer Attachment. The flow must not be forced to change its direction abruptly as to avoid the generation of turbulence and separation. The classic example for the Coanda-effect is exactly the spoon in stream that Rod described as Bernoulli's Law. This is important because this behavior holds for all flows limited by smoothly curved surfaces like aerofoils , streamlined obstacles, sails and…..especially…..Boat Hulls! I invite anyone how wants to be educated in this to get an engineering or physics degree or give it a google search and read that thread, not this one for the facts.
Rod Gheraghty, You were mostly wrong in my book when you took arrogant tone with a friend while you were in the process of professing wrongness. Otherwise, I wouldnt be bothering with this post.
…If you need to go over this in detail, please don't hesitate to call me.
I gave you a chance to correct yourself, but it appears you're not.
Rod G. You are wrong on several different levels regarding this thread. Firstly; you are wrong about the facts you claim to be proficient in. It appears you would rather baffle people with what you don't know???....or maybe you just didn't know better???
Pardon any perceived tone as I correct you regarding the facts.
Acceleration of a fluid is caused by pressure gradients. A fluid is accelerated in direction of the velocity if the pressure goes down. Thus a decrease of pressure is the cause of a higher velocity. It is wrong to say that a lower pressure is caused by a higher velocity.
Bernoulli's Law:
Unfortunately Rods version of Bernoulli and the example was done erroneously, e.g the spoon in the stream of water cannot be used as examples of Bernoulli's law because the static pressure in a free jet stream is equal to the static pressure in the environment regardless of the streaming velocity of the jet. Water can be considered an incompressible fluid, thus it will be at constant pressure (atmosphere pressure). Bernoulli does NOT work without pressure differential or the closed loop.
Coanda Effect:
The flow near limiting surfaces follows the geometrical shape of these surfaces. This behavior is called Coanda effect and is synonymous with Boundary Layer Attachment. The flow must not be forced to change its direction abruptly as to avoid the generation of turbulence and separation. The classic example for the Coanda-effect is exactly the spoon in stream that Rod described as Bernoulli's Law. This is important because this behavior holds for all flows limited by smoothly curved surfaces like aerofoils , streamlined obstacles, sails and…..especially…..Boat Hulls! I invite anyone how wants to be educated in this to get an engineering or physics degree or give it a google search and read that thread, not this one for the facts.
Rod Gheraghty, You were mostly wrong in my book when you took arrogant tone with a friend while you were in the process of professing wrongness. Otherwise, I wouldnt be bothering with this post.
…If you need to go over this in detail, please don't hesitate to call me.
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