3 ms·
Uhh. I was taught that in university in the late 80s. Some surfaces have a lot of friction and if you add surface imperfections the turbulent airflow actually r
by rawgabbit 5mo ago
Uhh. I was taught that in university in the late 80s. Some surfaces have a lot of friction and if you add surface imperfections the turbulent airflow actually reduces drag.
- clnhlzmn 5mo agoYou learned something different then because this finding is that some kinds of additional roughness delay the transition to turbulent flow which is pretty clear in the article.
- fsagx 5mo agohttps://phys.org/news/2014-01-smooth-rough-surfaces.html https://phys.org/news/2014-01-smooth-rough-surfaces.html A quick search looks to show the same general topic from more than a decade ago. I too have a recollection of this being discussed in the late 80s or early 90s. Maybe some folk wisdom that's just now getting quantified.
- rawgabbit 5mo agoThanks for clarifying.