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Mechanical Engineering

md ayaz ahmad

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Everything posted by md ayaz ahmad

  1. in converging nozle..........the fluid flow from this cross sectional area there velocity increase due to pressure energy converted into kinetic energy why because its area decreases, diverging nozzle just work opposite to the converging nozzle here area increase then kinetic energy converted into pressure energy. in diverging nozzle pressure increase and velocity decrease,,,,,,,, But in converging nozzle pressure decrease velocity increase,
  2. go through R K Rajput thermal engineering book ....ur problem will be solved in simple way,
  3. centrifugal pump works on the principle of vortex motion. example of vortex motion in home made by common seance. take a half bucket of water and insert hand inside the bucket and rotate the water either clockwise or anticlockwise then u see here rotating water comes at the outer diameter of the bucket. when the casing full of water and the impeller start the rotation a vacuum create inside the casing, The pressure Inside the casing is much lower than the pressure of sump(sump means -where the suction pipe mounted) then the water suck inside the casing from higher pressure to lower pressure. one more important point is here about centrifugal pump is- the head imparted by the impeller is greater than suction head. the casing area is gradually increase from inner to outer diameter , Due to this reason the kinetic energy dominated or converted into pressure energy, the water coming out from the delivery pipe is pressure energy or pressure head in terms of water
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