To determine the coefficient of impact of jet on the vanes.
Impact of jet on vanes set up with nozzle, vane holder, different types of vanes, weight balance with
weights, scale etc.
Choose the type of vane
Flat vane
Hemi spherical vane
Inclined vane
Move the counter balance weight to make the arm horizontal.
Click on arrow to proceed
Once the balance is made, the length of weight pan and counter balance distance is measured using a scale.
a = 13.55cm
b = 63cm
Put weight on the pan.
Open the inlet valve and bring the bubble to centre in spirit level using the counter balance.
Close outlet valve and find discharge by noting the time taken by water to fill certain height in the collecting.
Time taken by water to fill 5cm height, t=
Length of channel = 60cm
Breadth of channel = 60cm
Area of collecting tank = 3600cm2
Diameter of nozzle, d = 1.256cm
Area of the nozzle, A = 1.2389cm2 A = π × d2⁄4Discharge of water, Q =
Density of water, ρ = 1g/cm3
Distance a = 13.5cm
Distance b = 63cm
Wieght on the pan, W =
For Flat vane:
For curved vane (hemispherical):
For inclined vane (θ = 30° with the horizontal):
Velocity of jet, V = Q⁄A =
Theoretical force, Fth =
Actual force, Fact = W × b⁄a =
Coefficient of impact, Ci = Fact⁄Fth =
Trial =