Force of water out of a vertical pipe
Force of water out of a vertical pipe
(OP)
Hello. I have water on a bridge deck flowing into a gutter and into an 8 inch pipe that runs down the length of a 90 foot column. The pipe has a 90 degree bend at the bottom just before the water expels out of the column.
The water is flowing out too quickly and onto a nearby street. I am attempting to stop the water by using a steel plate approximately 6 inches in front of the pipe. (The client does not want to use an elbow.)
In order to design the steel plate, how can I calculate the force of water expelled from the pipe?
Thanks,
Glenn
The water is flowing out too quickly and onto a nearby street. I am attempting to stop the water by using a steel plate approximately 6 inches in front of the pipe. (The client does not want to use an elbow.)
In order to design the steel plate, how can I calculate the force of water expelled from the pipe?
Thanks,
Glenn





RE: Force of water out of a vertical pipe
I guess it must be remembered however, that the water must go somewhere from there once it is dissipated around the plate; also, I suspect some folks instead/also use flare or bell mouth outlets, I suspect to more widely disperse the flow/reduce force (from discharge points) than from a straight ell constriction etc.
RE: Force of water out of a vertical pipe
Basically, treat the flat plate as though it were an ell, assume it changes the direction of the water by 90 degrees. Force is derived from Reynold's Transport Theorem using momentum as the property in question.
RE: Force of water out of a vertical pipe
RE: Force of water out of a vertical pipe
Clearly, we're talking about storm water here.
Have you considered removing the offending elbow and inserting the end of the pipe in a prefabbed concrete box. That would dissipate the energy without the "open shower" effect.