Is this video AI generated? Very odd body and mouth movements, often very visible. Okay, I think I got it: There is a Russian original, and they use AI for translation, AI for new English voice, and AI for replacing the mouth movements! I think viewers should be informed first, as every time they do not see reality, everywhere.
@@akh345 ? your comment makes no sense. This is a video that has been altered. The original video is in Russian, and I explained how it was modified. Perhaps your comment is AI then :)
In this video, the velocity of the air inside the outlet tube is definitely greater than the velocity inside the inlet tube. There is no doubt about it. Because the pressure inside the inlet tube will be higher than atmospheric pressure. If you blow the inlet of this tube with a fan like in the video. If we put this tube in a wind tunnel, the inlet pressure should also be higher than the outlet pressure. Will there be a reaction force at the outlet of the tube? it will be. But this reaction force is not acting on the tube, but on the air. So it cannot become the engine of an airplane.
You could with the same success demonstrate that peas dropped in the funnel fly out faster on a bottom than enter it at the top and argue that this should mean that the funnel might fly upwards due to pea jet stream. If you reversed the funnel in the air, I believe it would have normal pressure in the narrow part and lower in the wider.
Imagine two pipes of different diameters connected by a smooth adapter. Now let us place this structure in the air flow with its wide end forward or, what is the same, move it relative to the stationary air. The flow enters the wide part of the tube, then passes into the narrow part, and at the same time, obviously, increases its velocity. Have we really got an air gas pedal, a kind of jet engine that runs without any fuel?! Something's not right here. A metaphysician like Newton will immediately say that the Creator of all things so arranged the universe that man could not get something for nothing, and such an engine is a priori impossible. And a physicist (like Newton) should find an error in this very plausible reasoning and understand in what exactly we deceive ourselves. Let's follow the air pressure along the axis of the pipe. Behind, at the exit from the narrow pipe, the pressure is atmospheric, as well as inside it: the air flies there by inertia. But in the adapter and in front of it, the pressure must be greater than atmospheric to drive the air into the narrow pipe and increase its speed. But before the wide pipe the pressure is again atmospheric, so at the entrance to the pipe in the area where the pressure increases, the air flow slows down and expands. So far ahead of the pipe, the cross-sectional area of the flow that will then enter the pipe is smaller than the cross-sectional area of the wide pipe and probably equal to the cross-sectional area of the narrow pipe. Then there is no acceleration of the air - with what speed the air moved far ahead of the wide pipe, with the same speed it flows out of the narrow pipe from behind. Here, as in other cases where we encounter seeming paradoxes, it is important to draw the lines of current correctly. For example, the wing of an airplane not only deflects the airflow downward behind the trailing edge, but also causes it to run into the leading edge from bottom to top, rather than horizontally. Or else: water moves much faster in the inside of a pipe bend than on the outside. And as in many videos devoted to hydrodynamics, we simulate the flow of our “engine” using the Vizimag program, because the mathematical equations describing the motion of an ideal fluid and a magnetic field are exactly the same.
I like this explanation (as the author of this video), and I like the question, of course. What happens in the narrow part of the tube, if we neglect the viscosity? The flow velocity is higher then outside the tibe, yes? But what do you think about the energy conservation in this case? :))
In this video, the velocity of the air inside the outlet tube is definitely greater than the velocity inside the inlet tube. There is no doubt about it. Because the pressure inside the inlet tube will be higher than atmospheric pressure. If you blow the inlet of this tube with a fan like in the video. If we put this tube in a wind tunnel, the inlet pressure should also be higher than the outlet pressure. Will there be a reaction force at the outlet of the tube? it will be. But this reaction force is not acting on the tube, but on the air. So it cannot become the engine of an airplane.
Is this video AI generated? Very odd body and mouth movements, often very visible.
Okay, I think I got it: There is a Russian original, and they use AI for translation, AI for new English voice, and AI for replacing the mouth movements!
I think viewers should be informed first, as every time they do not see reality, everywhere.
I was literally questioning my judging ability.
Is this comment AI generated? I mean a human would easily recognize that they are just watching an elderly gentleman talking about physics
@@akh345 ? your comment makes no sense. This is a video that has been altered. The original video is in Russian, and I explained how it was modified. Perhaps your comment is AI then :)
Am i Aİ gene .. aahh.. whatever..
Only AI exists, nothing else:) And I am the author of this video (in Russian).
Would assume in reverse that the entering air still spreads out, pressure drops and then drops further in second segment of the pipe.
In this video, the velocity of the air inside the outlet tube is definitely greater than the velocity inside the inlet tube. There is no doubt about it. Because the pressure inside the inlet tube will be higher than atmospheric pressure. If you blow the inlet of this tube with a fan like in the video.
If we put this tube in a wind tunnel, the inlet pressure should also be higher than the outlet pressure.
Will there be a reaction force at the outlet of the tube? it will be. But this reaction force is not acting on the tube, but on the air. So it cannot become the engine of an airplane.
You could with the same success demonstrate that peas dropped in the funnel fly out faster on a bottom than enter it at the top and argue that this should mean that the funnel might fly upwards due to pea jet stream.
If you reversed the funnel in the air, I believe it would have normal pressure in the narrow part and lower in the wider.
lol. couldn't hear above the blower noise.
This is the result of AI translation.
How this net deceleration related to drag force on the system? F_drag = mass_air × a_Netdeceleration ?
Imagine two pipes of different diameters connected by a smooth adapter. Now let us place this structure in the air flow with its wide end forward or, what is the same, move it relative to the stationary air. The flow enters the wide part of the tube, then passes into the narrow part, and at the same time, obviously, increases its velocity. Have we really got an air gas pedal, a kind of jet engine that runs without any fuel?! Something's not right here.
A metaphysician like Newton will immediately say that the Creator of all things so arranged the universe that man could not get something for nothing, and such an engine is a priori impossible.
And a physicist (like Newton) should find an error in this very plausible reasoning and understand in what exactly we deceive ourselves.
Let's follow the air pressure along the axis of the pipe. Behind, at the exit from the narrow pipe, the pressure is atmospheric, as well as inside it: the air flies there by inertia. But in the adapter and in front of it, the pressure must be greater than atmospheric to drive the air into the narrow pipe and increase its speed. But before the wide pipe the pressure is again atmospheric, so at the entrance to the pipe in the area where the pressure increases, the air flow slows down and expands.
So far ahead of the pipe, the cross-sectional area of the flow that will then enter the pipe is smaller than the cross-sectional area of the wide pipe and probably equal to the cross-sectional area of the narrow pipe. Then there is no acceleration of the air - with what speed the air moved far ahead of the wide pipe, with the same speed it flows out of the narrow pipe from behind.
Here, as in other cases where we encounter seeming paradoxes, it is important to draw the lines of current correctly. For example, the wing of an airplane not only deflects the airflow downward behind the trailing edge, but also causes it to run into the leading edge from bottom to top, rather than horizontally. Or else: water moves much faster in the inside of a pipe bend than on the outside.
And as in many videos devoted to hydrodynamics, we simulate the flow of our “engine” using the Vizimag program, because the mathematical equations describing the motion of an ideal fluid and a magnetic field are exactly the same.
I like this explanation (as the author of this video), and I like the question, of course. What happens in the narrow part of the tube, if we neglect the viscosity? The flow velocity is higher then outside the tibe, yes? But what do you think about the energy conservation in this case? :))
In this video, the velocity of the air inside the outlet tube is definitely greater than the velocity inside the inlet tube. There is no doubt about it. Because the pressure inside the inlet tube will be higher than atmospheric pressure. If you blow the inlet of this tube with a fan like in the video.
If we put this tube in a wind tunnel, the inlet pressure should also be higher than the outlet pressure.
Will there be a reaction force at the outlet of the tube? it will be. But this reaction force is not acting on the tube, but on the air. So it cannot become the engine of an airplane.