Fluid Mechanics

surface tension

2100

jet pump

having no motion of one fluid layer relative to the other.

both (a) and (b)

mean velocity

sleevejoint

1000 P'/S

suction minus vapor pressure of the liquid at suction temperature.

monotonically decreases.

logarithmic

friction co-efficient for flows at equal Reynold number.

rapid pressure change due to a rapid change in the rate of flow.

centrifugal

Mach number

smaller than

inverse of the fluid viscosity.

increases

directional control

inertial forces control and viscous forces are unimportant.

more than

0.5

7 to 15

one fourth as that of A.

all (a), (b) and (c)

Newtonion

flow pressure approaches its vapor pressure at the prevailing temperature.

2

0.44

1000

None of these

more than

outside diameter

diaphragm

Weber number

8

both (b) and (c)

all (a), (b) and (c)

Propeller

2 to 3

Weight = buoyancy + drag

20 KPa

A forced vortex occurs when fluid rotates as a solid about an axis.

is zero at the centre and varies linearly with the radius.

tungsten

is constant along a stream line.

Low suction pressure

single stage vertical

impulse

0.5

displaced volume of the fluid.

With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids.

depends only on Reynolds number.

moving

Non-uniformity of flow

cases of axial symmetry.

shallow beds of solids and proper choice of particle size

2

total

amount of energy stored.

both (a) & (b)

Re >>1, decelerating flow

difference in

Turbulent forces

Rotameter

when the roughness projections are much smaller than the thickness of the laminar film.

none of these.

energy which it can store.

decreases

0.5 d

have different diameters.

are not subject to air binding.

surface tension

all (a), (b) and (c).

cross-section of the channel is reduced.

approximately as the square of the velocity.

0.3

-1

all (a), (b), and (c).

average velocity

reduce the water hammer.

small differential

where there is no velocity gradient.

Reynolds number

force per unit mass equals acceleration.

momentum

intensity of pressure of the liquid.

all 'a', 'b' & 'c'

conservation of mass.

absolute roughness increases linearly with time.