21. The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.
22. The ratio of inertial forces to elastic forces is called the __________ number.
23. $$\frac{{{\text{N}}_{{\text{Re}}}^2}}{{{{\text{N}}_{{\text{Fr}}}}}}$$ is called the __________ number.
24. The ratio of inertial forces to gravity forces is called the __________ number.
25. The ratio of pressure forces to inertial forces is called the __________ number.
26. Ratio of inertial forces to surface tension forces is called the __________ number.
27. The ratio of inertial forces to viscous forces is called the __________ number.
28. Cavitation in a centrifugal pump can be avoided by keeping the
29. Which of the following must be followed by the flow of a fluid (real or ideal)?
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.
30. Cavitation in a centrifugal pump results from
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