This preview shows pages 1–2. Sign up to view the full content.
ME 309 Fall 2008
Section 2 (Merkle)
Homework # 1
Due Wed 27 Aug 2008
Problem 11.
Using Appendix A in the text, find values for the following fluid
properties.
Express all answers in terms of SI units, using
kg/m
3
for density and
kg/ms
for viscosity.
Find
:
a
)
The minimum allowable viscosity of SAE 20W oil at 10
C
; (Note:
The middle
column of Table A.5, pg 705 gives the dynamic viscosity of oil,
μ
, but the two right
columns give the kinematic viscosity,
ν
.
These two quantities are related to each
other by the fluid density,
ρ
as:
ν =
μ / ρ
).
b
)
The minimum allowable dynamic viscosity of SAE 20W oil at 100
Ci
For the
density of oil, use
ρ
=
820
kg/m
3
.
c
)
The density and dynamic viscosity of water at 5
C
;
d
)
The density and dynamic viscosity of water at 95
C
;
e
)
The density and dynamic viscosity of air at 5
C
at atmospheric pressure;
f
)
The density and dynamic viscosity of air at 95
C
;
g
)
From
a
through
f
, what major differences do you observe between oil, water and
air? (Note air and water are two of the most common fluids of interest for both
practical and engineering reasons.)
h
)
Find the units of the product of density times velocity (measured in
m/s
) times a
length (measured in
m
) divided by dynamic viscosity;
Solution:
a
)
Find
:
The minimum allowable viscosity of SAE 20W oil at 10
C
;
Answer
:
From Table A.5, p 705, SAE 20W oil must have a viscosity greater than or
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '08
 MERKLE

Click to edit the document details