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Standard XII
Physics
Vectors
Water is flow...
Question
Water is flowing in a pipe of radius 1.5cm with an average velocity of 15cm/s. What is the nature of flow? Given coefficient of viscosity of water is 10
-3
kgm
-1
s
-1
and its density is 10
3
kg/m
3
.
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Solution
U
sin
g
,
v
=
2
(
ρ
-
σ
)
r
2
g
9
η
O
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w
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,
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F
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.
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Q.
Oil of density 920 kg/m
3
and dynamic viscosity 0.3 Pa-s flows in a pipe of diameter 15 cm at a velocity of 2 m/s. What would be the velocity of flow of water in a 1 cm diameter pipe, to make the two flows dynamically similary? The density and viscosity of water can be taken as a 998 kg/m
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and 1.31
×
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Pa-s respectively.
Q.
Water flows through a pipe of radius 1.0 cm . The viscosity of water is 10
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. If the velocity of the flow at the centre is 10 cm s
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The rate at which water flows through a capillary of length
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with an internal diameter of
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m
,
coefficient of viscosity
1.3
×
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−
3
k
g
m
−
1
s
−
1
and pressure head
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c
m
of water in cc. per second is:
Q.
Water from a pipe is coming at a rate of
100
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i
t
r
e
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c
m
, the Reynolds number for the flow is of the order of (density of water
=
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Q.
What will be the nature of flow of water from a circular tap, when its flow rate increased from
0.18
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to
0.48
L/min
? The radius of the tap and viscosity of water are
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