Showing posts with label Flow. Show all posts
Showing posts with label Flow. Show all posts

Saturday, 26 February 2011

Have you ever wondered why golf balls have dimples?

If yes, I must ask what is wrong with you. (YOU VERY SAD PERSON)

Anyhow, now I've asked the question, I feel obliged to give an answer.

What it boils down to is the two different types of airflow; laminar and turbulent. Laminar flow is characterised  by a system of orderly layers, with no eddies or irregular fluctuations. In simpler terms, the flow lines do not cross.
Turbulent flow then is where there is not a system of orderly layers; that the flow lines cross.



Laminar flow past a ball is bad; it forces a larger separation in the air flows, causing greater drag, so that the ball will not travel very well. However, the balls dimples cause the flow lines to cross, and creates a turbulent stream behind the ball, lessening drag.

Really, all I needed to say was that golf balls with dimples travel further... But that would have been no fun.