Message text written by Tony Moss >BUT as soon as the veriest tip of the nozzle touches the surface of the water it is 'snatched' downwards.<
I wonder if there is a surface tension/capillary type effect happening here (probably not)... -- or perhaps the effect is most pronounced near the surface where the kinetic energy of the water isn't dissipated by the water/air interface as effectively as when the jet is totally submerged and surrounded by 'lots' of water which may be able to transfer the energy away rather than causing turbulance. One other point - As Tony (re: the scoop paddles) and David (re: bluffs) noted: the geometry of the nozzle itself may have a profound impact on the effect. I'll bet the flow rate has a huge impact too. I'll try it with other nozzles to see what happens.... Chuck
