Re: AGM 2012

Post count: 472
#5013 |

Very good. The water presumably draws water up the hole by Bernoulli’s effect which then increases the flow, reducing the pressure so that the rocks are effectively “sucked” out. An interesting idea, in complete contrast to the classical “water-hammer” effect. Maybe this is mentioned in the paper – I’ve only glanced through it.

The hole acts like a slat on the leading edge of an aerofoil section, delaying boundary-layer separation and reducing induced drag…………….(wanders off muttering into grey beard)