When a valve is closed suddenly in a pipe with flowing water, a water hammer pressure wave is set up. The very high pressures generated by such waves can damage the pipe. The maximum pressure, p max , generated by water hammer is a function of liquid density, ρ , initial flow speed, U 0 , and liquid bulk modulus, E υ . How many dimensionless groups are needed to characterize water hammer? Determine the functional relationship among the variables in terms of the necessary Π groups.
When a valve is closed suddenly in a pipe with flowing water, a water hammer pressure wave is set up. The very high pressures generated by such waves can damage the pipe. The maximum pressure, p max , generated by water hammer is a function of liquid density, ρ , initial flow speed, U 0 , and liquid bulk modulus, E υ . How many dimensionless groups are needed to characterize water hammer? Determine the functional relationship among the variables in terms of the necessary Π groups.
When a valve is closed suddenly in a pipe with flowing water, a water hammer pressure wave is set up. The very high pressures generated by such waves can damage the pipe. The maximum pressure, pmax, generated by water hammer is a function of liquid density, ρ, initial flow speed, U0, and liquid bulk modulus, Eυ. How many dimensionless groups are needed to characterize water hammer? Determine the functional relationship among the variables in terms of the necessary Π groups.
4. Determine which of the following flow fields represent a possible
incompressible flow?
(a) u= x²+2y+z; v=x-2y+z;w= -2xy + y² + 2z
a
(b) V=U cose
U coso 1 (9)
[1-9]
Usino |1 (4)]
[+]
V=-Usin 1+1
3. Determine the flow rate through the pipe line show in the figure in ft³/s,
and determine the pressures at A and C, in psi.
5'
B
C
12°
20'
D
6"d
2nd-
Water
A
5. A flow is field given by V = x²₁³+xy, and determine
3
·y³j-
(a) Whether this is a one, two- or three-dimensional flow
(b) Whether it is a possible incompressible flow
(c) Determine the acceleration of a fluid particle at the location (X,Y,Z)=(1,2,3)
(d) Whether the flow is rotational or irrotational flow?
Chapter 7 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
Starting Out with C++ from Control Structures to Objects (9th Edition)
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