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C1127 Pages 2

(c) Total drag per unit length on the sides of the plate.
Take density of air = 1.2 kg/m? and Kinematic viscosity of air = 0.155104 m/s
The pressure drop AP in a pipe of diameter D, length L, due to turbulent flow
depends on mass density ‏م‎ and viscosity ப of the flowing fluid, mean velocity of
flow V and average height K of roughness projections on the pipe surface.
Obtain a dimensionless expression for AP by Buckingham’s 7 theorem. Hence
show that
‏اهناك = بط‎
Explain the different types of hydraulic similarities that must exist between a
prototype and its model.
A 2.5m ship model was tested in fresh water (೧ =1000 kg/m*) and measurements
indicated that there was a resistance of 45 N when the model was moved at 2
m/s. Workout the velocity of 40m prototype. Also calculate the force required to
drive the prototype at this speed through sea water (೧ =1025 kg/m’).

ಸಸ್ಯ मर मर

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