Timeline for How does Reynolds Number affect skin friction drag?
Current License: CC BY-SA 3.0
6 events
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| Jan 31, 2020 at 8:15 | comment | added | Peter Kämpf | @ymb1 Turbulent boundary layers "borrow" energy from their outer fringes and transport it to the wall. By kicking the laggards close to the wall forward, this mechanism decelerates the outer part of the BL, making it thicker in the process. While laminar BLs only exchange energy perpendicular to the flow by friction, turbulent BLs transport the moving air around the BL, so the energy exchange perpendicular to the flow direction is much higher. And there is no energy to be added – as Homer Simpson says: We obey the laws of thermodynamics! | |
| Jan 30, 2020 at 22:51 | comment | added | user14897 | Hi Peter: RE: greatly reducing the deceleration of the flow close to the wall, at the price of slowing down and expanding the whole boundary layer. -- I don't understand how (reducing the deceleration), (slows down) the whole boundary layer? Many thanks. | |
| Apr 13, 2017 at 12:59 | history | edited | CommunityBot |
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| Mar 29, 2017 at 21:08 | vote | accept | Volkan Aydıngül | ||
| Mar 29, 2017 at 20:19 | history | edited | Peter Kämpf | CC BY-SA 3.0 |
added 135 characters in body
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| Mar 29, 2017 at 20:09 | history | answered | Peter Kämpf | CC BY-SA 3.0 |