Timeline for Confused about what makes air follow a wing
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 16, 2021 at 14:17 | comment | added | D. Halsey | @Chiral Anomaly Viscosity is directly responsible for creating the layer of sheared flow at the surface (the boundary layer), which contains the vorticity which is responsible for perturbing the velocities & pressures to allow the flow to conform to the surface. | |
| Aug 16, 2021 at 14:05 | comment | added | Al Brown | @D.Hasley That just shows you don’t understand the process of diffusion, pressure driven flows, and how gas molecules actually travel into low pressure areas, because one cannot arrive at this full understanding by never wondering why momentum initially doesn’t seem to matter. The reason for the surprise prior to understanding this is Newton’s first law, and the ultimate explanation is that gas molecules have significant velocity in all directions, not just the direction of bulk velocity of the gas. If they did not, momentum would be meaningful and there would be delays in this “backfilling” | |
| Aug 16, 2021 at 12:46 | comment | added | Vincent Thacker | Does this answer your question? Why does a fluid follow the wing? | |
| Aug 16, 2021 at 11:53 | comment | added | D. Halsey | @ Al Brown "...haven’t you ever been surprised that air can respond fast enough to fill the backside of a fast-moving wing when momentum isn’t pushing any there?" This doesn't make any sense. The wing is moving through the air (or equivalently, the air is flowing over the wing). There is no problem for the air to get to the back of the wing! | |
| Aug 16, 2021 at 11:50 | review | Close votes | |||
| Aug 24, 2021 at 15:45 | |||||
| Aug 16, 2021 at 11:49 | comment | added | D. Halsey | I've flagged this as a duplicate. If you have questions about those previous answers, they should have been addressed there, and you shouldn't have accepted one of them. I wrote one of the answers, and could have edited it to clarify, but I'm not about to write another answer here. | |
| Aug 16, 2021 at 2:12 | comment | added | Al Brown | @ChiralAnomaly yeah makes sense i see | |
| Aug 16, 2021 at 1:12 | comment | added | Chiral Anomaly | @AlBrown You're right that my reference to "pressure" was to simplistic, but I didn't mean that the question's answer is obvious. I only meant that the question might need to be clarified. One interpretation of the question could be, why does air remain in contact with the upper surface of the wing? A second interpretation could be, what makes the air flow smoothly over the upper surface of the wing, instead of only being turbulent? Viscosity doesn't matter for the first interpretation of the question, but it might matter for the second interpretation. | |
| Aug 15, 2021 at 23:14 | comment | added | Al Brown | @ChiralAnomaly but haven’t you ever been surprised that air can respond fast enough to fill the backside of a fast-moving wing when momentum isn’t pushing any there? I mean, I answered, but anyone who hasn’t been surprised and briefly confused by that isnt a very deep thinker imo. Is great question esp this kind of site. Also, ten percent is too high to be called an anomaly 😉 | |
| Aug 15, 2021 at 23:03 | comment | added | Al Brown | Great question btw. Glad you asked again | |
| Aug 15, 2021 at 21:44 | answer | added | Al Brown | timeline score: 1 | |
| Aug 15, 2021 at 20:53 | history | asked | b0red | CC BY-SA 4.0 |