M E 320 Professor John M. Cimbala Lecture 23
Today, we will:
•
Do an example problem – diffuser
•
Begin discussing pumps, and how they are analyzed in pipe flow sytems
Example Problem – Diffuser
Given: Water (
ρ
= 1000 kg/m
3
,
μ
= 1.00 × 10
-3
kg/m⋅s) flows through a horizontal diffuser,
as sketched. The flow is fully developed at both locations 1 and 2. The inner diameter
changes from d to D through the diffuser. The outlet of the diffuser is open to atmospheric
pressure.
2
1 10
o
V
1
10
o
d
D
V
2
Given information:
• d = 1.2 cm
• D = 2.0 cm
•
θ
= 2 × 10
o
= 20
o
(
θ
is the total included angle)
• V
1
= 6.0 m/s
• P
2
= P
atm
•
α
1
= 1.06 and
α
2
= 1.06 (fully developed turbulent pipe flow)
To do: Calculate the gage pressure at location 1 and discuss.
Solution: To be done in class.
