FLUID MECHANICS FUNDAMENTALS+APPS
4th Edition
ISBN: 2810022150991
Author: CENGEL
Publisher: MCG
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Chapter 6, Problem 43P
As a follow-up to Prob. 6-41, it turns out that for a large enough area ratio A2,/A1, the inlet pressure is actually smaller than the outlet pressure! Explain how this can be true in light of the fact that there is friction and other irreversibilities due to turbulence, and pressure must be lost along the axis of the duct to overcome these irreversibilities.
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6. A part of the structure for a factory automation system is
a beam that spans 30.0 in as shown in Figure P5-6. Loads
are applied at two points, each 8.0 in from a support. The
left load F₁ = 1800 lb remains constantly applied, while
the right load F₂ = 1800 lb is applied and removed fre-
quently as the machine cycles. Evaluate the beam at both
B and C.
A
8 in
F₁ = 1800 lb
14 in
F2 = 1800 lb
8 in
D
RA
B
C
4X2X1/4
Steel
tube
Beam cross section
RD
30. Repeat Problem 28, except using a shaft that is rotating
and transmitting a torque of 150 N⚫m from the left bear-
ing to the middle of the shaft. Also, there is a profile key-
seat at the middle under the load.
28. The shaft shown in Figure P5-28 is supported by bear-
ings at each end, which have bores of 20.0 mm. Design
the shaft to carry the given load if it is steady and the
shaft is stationary. Make the dimension a as large as pos-
sible while keeping the stress safe. Determine the required
d = 20mm
D = ?
R = ?|
5.4 kN d=20mm
Length not
to scale
-a = ?-
+а=
a = ? +
-125 mm-
-250 mm-
FIGURE P5-28 (Problems 28, 29, and 30)
Chapter 6 Solutions
FLUID MECHANICS FUNDAMENTALS+APPS
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