What will happan to flow of water, if suddenly stopped and released afterward?

Question

love to recieve the answer.

case 1 :pipes
case 2: open channel
case 3: orifice

Answer 1

In a pipe there is a pressure drop associated with the flow of waer through the pipe. The pressure drop is a function of flow rate, pipe diameter, pipe lenght and number of fittings (restrictions)

Turn the water on the you will create a pressure differential across the lenght of pipe . Turn the water off the flow stops and the pressure drop is eleiminated allowing the pressure to equalize along the pipe lenght.

There is also water hammer which is a shock wave transmitted through the water due to sudden opening and closing of a valve. Most people may be familiar with this when an automatic washing machine opens and closes its solenoid valve causing the pipes to shake.

With an orifice in a pipe system you are just adding a restriction of a known value. In theory you could replace the equivalent pressure drop of any pipe lenght (and fittings) with a single orifice. You may also consider a valve as a variable orifice.
Same thing happens with an orifice as flow is started and stopped the pressure in teh pipe equalizes on both sides of teh orifice as flow becomes zero.

Open channel is the exception. The flow rate is not ncessarily controlled in as visible a fashion. Place a board in the open channel and yes there will be an immeadiate flow adjustment until the water level rises above the board and continues flowing.
Water flowing in an open channel is determined by the pressure head or height of the water supplying the channel. And may be measured by determining the height of the water above the board. In essence you have a weir, which can be used to determine flow rate.
Raising the dam(board) height reduces the delta height between say a lake surface and the height of the board.

If a pump were feeding the open channel then the shutoff head height is the limiting factor so unless the open channel had walls high enough to reache the shut off head of the pump it would appear that no flow control would be possible as adding a board would just cause the channel heigh to rise until it over flowed. The only diference in pump fed open channel flow would be the slight addition of discharge head added to the pump by raising teh water level behind a taller board

Answer 2

Get a book on Fluid Mechanics or hydraulics and study carefully.

Moving water has kinetic energy and it depends upon the chacteristics of the size of the pipe or channel, volume flow amount, velocity of flow etc.

Flow can be stopped and satrted at source or it can be obstructed and let go at its end point and the results would vary in each case. You can hypothetically imagine the situation. In case of a pipe sudden closure or opening could be achieved with a butterfly valve, or an obstruction would be a plate or a dam - that could give rise to a water hammer. You can figure out the others.

Answer 3

if the flow is stoped in a pipe.. there wouldnt be much of a difference in flow after the stop as the pipe is rigid and it does not vary its shape due to the presuure applied by the closure of the pipe. " so the flow would be regular"
If the flow is from a channel then, the watre level in the channel would rise and inturns rising the pressure level of the water, so " the flow would be more forceful.
If the flow is from an orifice, then the force of flow would depend on the medium in which the area is open or closed like in pipe or in channel.

Answer 4

Not sure I understand your question. Do you mean why is the flow of water from my taps suddenly stopping then restarting?

if so this is air in your lines causing the water to stop flowing while the air bubble is pushed out then restarting when the air is gone. this usually happens after you have done work on the plumbing and all the air has not been bleed out. It will also cause a hammering sound in your pipes while you are running the water.

Answer 5

Go to your kitchen or bathroom, or anywhere else that there is a tap or faucet. Turn the handle. Water will come out. Turn the handle the other way. The flow will be cut off. Turn it again and the flow will start again. That is what happens when water flow is stopped and then started again.

Answer 6

the potential energy gets cnverted into kinetic energy. Example, dams.

Answer 7

it is due to gravitational potential of the earth