Solution Manual for Fluid Mechanics for Engineers, 2017 Edition
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Chapter 1
Properties of Fluids
1.1. (a) Find the dimensions of CL as follows,
CL = FL
1
2 ρV 2 A → CL = MLT−2
(ML−3 )(LT−1 )2 (L2 ) = MLT−2
MLT−2 = 1
Therefore CL is dimensionless and does not depend on the system of units used.
(b) No adjustment factor is necessary when USCS units are used instead of SI units.
1.2. (a) Inserting the dimensions of the variables in the given equation yields
ρ d2 z
dt2 + a dz
dt + bz = c
┌ M
L3
L
T2 + a L
T + b[L] = c
┐ ┌ ┐ ┌ ┐
┌ M
L2 T2 + a L
T + b[L] = c
┐ ┌ ┐
Therefore, the required dimensions of the parameters a, b, and c are,
a = M
L3 T , b = M
L3 T2 , c = M
L2 T2
┌ ┐ ┌ ┐ ┌ ┐
(b) If ρ∗, z∗, and t∗ are the given variables in nonstandard units, then the conversion factors
are:
ρ
ρ∗ = 103 , z
z∗ = 10−3 , t
t∗ = 3600
1.3. (a) Inserting the dimensions of the variables in the given equation yields
Q = 1
n
A 5
3
P 2
3
S 1
2
0 → L3 T−1 = 1
( )
(L2 ) 5
3
L 2
3
(−) 1
2 → L3 T−1 = L 8
3
−
Since the dimension of the left-had side of the equation is not equal to the dimension on
the right-hand side of the equation, the given equation is not dimensionally homogeneous .
Properties of Fluids
1.1. (a) Find the dimensions of CL as follows,
CL = FL
1
2 ρV 2 A → CL = MLT−2
(ML−3 )(LT−1 )2 (L2 ) = MLT−2
MLT−2 = 1
Therefore CL is dimensionless and does not depend on the system of units used.
(b) No adjustment factor is necessary when USCS units are used instead of SI units.
1.2. (a) Inserting the dimensions of the variables in the given equation yields
ρ d2 z
dt2 + a dz
dt + bz = c
┌ M
L3
L
T2 + a L
T + b[L] = c
┐ ┌ ┐ ┌ ┐
┌ M
L2 T2 + a L
T + b[L] = c
┐ ┌ ┐
Therefore, the required dimensions of the parameters a, b, and c are,
a = M
L3 T , b = M
L3 T2 , c = M
L2 T2
┌ ┐ ┌ ┐ ┌ ┐
(b) If ρ∗, z∗, and t∗ are the given variables in nonstandard units, then the conversion factors
are:
ρ
ρ∗ = 103 , z
z∗ = 10−3 , t
t∗ = 3600
1.3. (a) Inserting the dimensions of the variables in the given equation yields
Q = 1
n
A 5
3
P 2
3
S 1
2
0 → L3 T−1 = 1
( )
(L2 ) 5
3
L 2
3
(−) 1
2 → L3 T−1 = L 8
3
−
Since the dimension of the left-had side of the equation is not equal to the dimension on
the right-hand side of the equation, the given equation is not dimensionally homogeneous .
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Subject
Mechanical Engineering