EN 1029 Laboratory
Laboratory FM

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In reality, there is some energy loss and velocity is not uniform. Equation (5) is therefore corrected to

Q=Ca22g(h1-h2)1-a2a12 (15)

Where C is the coefficient of the meter. Its value usually lies in within range 0.92 to 0.99.

Ideal pressure distribution is given in equation (7)

hn-h1u222g=a2a12-a2an2 (16)

3.Experimental procedures and results

3.1 Experimental procedure – Impact of a Water Jet

The apparatus shown in Figure 1 was levelled and lever was balanced, with jockey weight at zero setting. Weight of the jockey was measured. Diameter of the nozzle, height of the vane above the nozzle and the distance from the pivot of the lever to the centre of the vane were recorder.
Water was then released through the supply valve and flow rate increased to maximum. The force on the vane displaces the lever, which is then restored to its balanced position by sliding the jockey weight along the lever. The mass flow rate can be established by gathering of water over a timed interval. Additional readings are then taken at number of reducing flow rates.
The most efficient way of reducing flow is to place jockey weight precisely at desired position, and then adjust the flow control