An interesting experiment with water and air.

[vineet_kiran]

See the air bubbles rushing along with water!

[vineet_kiran]

Without doing this experiment but using what I have done and what I am currently doing I will  say that the "rate" of discharge will be the same and the total volume will be the same,,

I think you mean flow of water will neither be accelerated nor be decelerated due to air flow.

* but* now you have the air volume replacing some of the water volume so your water will drain slower due to the decrease in water volume per\minute passed through the pipe.

Obviously discharge (flow per sec) will be reduced due to presence of air which is same as draining the water using a smaller pipe  which is not of any concern.

But what about total energy?  Whether you drain out water using a smaller pipe or bigger pipe all the water in the container has to come  out due to available water head 'H' and total energy developed in both cases will be the same. By using smaller pipe you will be dissipating the energy slowly and with a bigger pipe energy is exhausted quickly.

Total energy = Energy stored in water with head 'H'  +  Energy developed by air (kinetic) coming out of pipe.

Hence you will get additional energy in the form of kinetic energy developed by air.

Energy will be conserved only if air decelerates the speed of water coming out of pipe. Reduction in water flow per minute (discharge) is not of any concern.

So, if you conform that flow of water is neither accelerated nor decelerated  due to air flow then it is a definite case of overunity!

[Gabriele]

Interesting experiment indeed. Look at the picture i atached. What if we submerge that way the and of the hose in a sealed container of water? When we add the cotton and let the air enter the hose,the archimedes law should pull up the hose contained in the water. Than we close the hole filled with cotton,we let all air escape from hose,and manually move down the hose to repeat the cycle...what do you think about that vineet kiran?

[vineet_kiran]

@Gabriele


Thanks for your observation.    I didn't get the idea clearly.   Air can fill in the hose only upto  some extent.  Once the air pressure in hose builds up,  air automatically escapes from the opening on the left side.  (ie., from the end where you are letting the air inside the hose)

[Gabriele]

So