In fluid mechanics, the velocity of the liquid going in or out (source-sink) of a hole in a two dimensional model is Q/(2 pi r). http://farside.ph.utexas.edu/teachin...ml/node63.html
What is the velocity in three dimensions? Is it Q/(4 pi r^2) ?
What is the velocity in three dimensions? Is it Q/(4 pi r^2) ?
