Verification of Bernoulli’s Equation


Objective of the experiment is to verify Bernoulli’s equation along a stream line.


Bernoulli’s equation is a very powerful tool in fluid mechanics. For steady, inviscid & incompressible flow

 Apparatus used:

  • Bernoulli’s equation test setup.
  • Stop watch & collecting tank.


  • Open the measuring tank valve fully, to keep the tank empty. Close the outlet valve.
  • Open the inlet valve and let water rise to some height ‘h’ in the inlet tank. Measure this height on the piezometer. Now open the outlet valve slightly. If water level in the tank falls, close the outlet valve slightly and vice-versa.
  • Thus adjust the outlet valve fill the water level remains constant at ‘h’, and also readings on each of the piezometer.
  • Check if reading is correctly written. Close the measuring tank valve. Measure the discharge, i.e. note rise in water level in 5 or 10 sec., write these and also measure and note length and breadth of the tank. This completes on run. Take at least three runs by changing the discharge
  • Note down the area of the conduit at various gauge points.
  • Open the supply valve and adjust the flow so that the water level in the inlet tanks remains constant.
  • Measure the height of water level (above an arbitrarily selected suitable plane) in different remains constant.
  • Measure the discharge of the conduit with the help of measuring tank.
  • Repeat steps 2 to 4 for two more discharges.
  • Plot graph between total energy and distance of gauge points starting from upstream side of conduit.


  • Draw the Hydraulic Grade Line (HGL) & Energy Grade Line (EGL) of the system.
  • Take a picture of the test setup during experiment & paste that with the report sheet.


  • Reading is to be taken when the flow through the channel is almost steady.
  • Readings are to be taken carefully so that chances of errors (like parallax error, human error during stop watch reading etc.) are minimized.

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