M E 320 Professor John M. Cimbala Lecture 25
Today, we will:
•
Continue our discussion about dimensional analysis with pumps
•
Do an example problem – dimensional analysis with pumps; the affinity laws
•
Discuss turbines
From previous lecture…dimensional analysis of pump parameters:
(
)
(
)
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function ,Re, and function ,Re,
where
Capacity coefficient Head coefficient Pow
HQ PQ
QH P
CCD CCD
gH bhp
CC C
DD D
εε
ωω ρω
==
== =
V
er coefficient
But for many pumps, effects of Re and roughness are small at high Re, and thus,
() ()
function and function
H
QPQ
CC CC≈≈
