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Alan Baker wrote:
... As the air the plane has forced downward encounters more air, the momentum is diffused so that a greater and greater mass of air moves downward at smaller and smaller velocities (net)... ...until it encounters the ground. Yikes! Eventually, ALL of the air will be on the ground! And eventually, that downward deflection makes it way until it -- very diffusely -- impacts upon the surface of the earth. That is the only thing that finally stops it. That assertion is not true in general. What appears to happen instead is that any downward deflection is quickly reversed, leading to what is known as a shed vortex. Here are some links on the subject: http://www.grc.nasa.gov/WWW/K-12/airplane/shed.html Sorry, but the vortex is an edge effect. The net flow is downward. Mankind needs to set up fans IMMEDIATELY to move air back up into the sky! |
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