Force Exerted by a Jet of Water on a Series of Vanes

Force Exerted by a Jet of Water on a Series of Vanes
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Lecture By: Er. Himanshu Vasishta, Tutorials Point India Private Limited.

[TutorialsPoint_]

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[praveenjain]

For the flat vertical plat moving in direction of jet, we have taken F proportional to (V-u)(V-u). How it is different in case of moving vanes, jet is always in contact with moving vertical plate also? In comparison here we have taken V(V-u) which is not clear.

[shubhamchalakh]

hello, i was having same doubt about it so i reffered R K BANSAL'S book it states 'In this case the mass of water coming out from the nozzle per second is always in contact
with the plates, when all the plates are considered. Hence mass of water per second striking the series of plates paV.'

[ashishnarvaria]

Sir what is the difference in this case and moving plate??

[harkeshyadav]

Why we take mass flow rate striking vane is v it should be v-u as sir taken v-u in a video in which vertical plate is moving

[pankajmaurya]

i m not justified with final velocity to be 0.it should be like initial mom. mv-final momentum mu.then it will come m(v-u)& now multiply with mass flow rate which is mv and it will give force in x direction that is pav(v-u).