FLUID MECHANICS-EBOOK>I<
2nd Edition
ISBN: 2819480256061
Author: HIBBELER
Publisher: INTER PEAR
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Chapter 3, Problem 5P
To determine
The equation of streamline that passes through point
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A counter flow double pipe heat exchanger is being used to cool hot oil from 320°F to 285°F
using cold water. The water, which flows through the inner tube, enters the heat exchanger at 70°F
and leaves at 175°F. The inner tube is ¾-std type L copper. The overall heat transfer coefficient
based on the outside diameter of the inner tube is 140 Btu/hr-ft2-°F. Design conditions call for a
total heat transfer duty (heat transfer rate between the two fluids) of 20,000 Btu/hr. Determine the
required length of this heat exchanger (ft).
!
Required information
A one-shell-pass and eight-tube-passes heat exchanger is used to heat glycerin (cp=0.60 Btu/lbm.°F) from 80°F to 140°F
by hot water (Cp = 1.0 Btu/lbm-°F) that enters the thin-walled 0.5-in-diameter tubes at 175°F and leaves at 120°F. The total
length of the tubes in the heat exchanger is 400 ft. The convection heat transfer coefficient is 4 Btu/h-ft²°F on the glycerin
(shell) side and 70 Btu/h-ft²°F on the water (tube) side.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Determine the rate of heat transfer in the heat exchanger before any fouling occurs.
Correction factor F
1.0
10
0.9
0.8
R=4.0 3.0 2.0.15 1.0 0.8.0.6 0.4 0.2
0.7
0.6
R=
T1-T2
12-11
0.5
12-11
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
(a) One-shell pass and 2, 4, 6, etc. (any multiple of 2), tube passes
P=
T₁-11
The rate of heat transfer in the heat exchanger is
Btu/h.
!
Required information
Air at 25°C (cp=1006 J/kg.K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg.K) in a cross-flow heat exchanger
with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750
W/K and the mass flow rate of air is twice that of oil.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Air
Oil
80°C
Determine the effectiveness of the heat exchanger.
Chapter 3 Solutions
FLUID MECHANICS-EBOOK>I<
Ch. 3 - Prob. 1FPCh. 3 - A two-dimensional flow field is defined by u =...Ch. 3 - Prob. 3FPCh. 3 - The velocity of particles of dioxitol along the x...Ch. 3 - Prob. 5FPCh. 3 - Fluid flows through the curved pipe at a steady...Ch. 3 - Prob. 7FPCh. 3 - Fluid flows through the curved pipe such that...Ch. 3 - A two-dimensional flow field for a fluid can be...Ch. 3 - A two-dimensional flow field for a liquid can be...
Ch. 3 - A two-dimensional flow field for a fluid is...Ch. 3 - Prob. 4PCh. 3 - A flow field is defined by u = (2x2 + 1) m/s and υ...Ch. 3 - A flow field for a fluid is defined by u = (2 + y)...Ch. 3 - Particles travel within a flow field defined by V...Ch. 3 - Particles travel within a flow field defined by V...Ch. 3 - A flow field is defined by u = 10 m/s and υ = −3...Ch. 3 - A balloon is released into the air from the origin...Ch. 3 - A balloon is released into the air from point (1...Ch. 3 - Prob. 12PCh. 3 - A fluid has velocity components of u = (3x2 + 1)...Ch. 3 - A particle travels along the streamline defined by...Ch. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Prob. 17PCh. 3 - Prob. 18PCh. 3 - A particle travels along a streamline defined by...Ch. 3 - Prob. 20PCh. 3 - The circulation of a fluid is defined by the...Ch. 3 - Prob. 22PCh. 3 - A two-dimensional flow field for benzene is...Ch. 3 - Air flows uniformly through the center of a...Ch. 3 - Oil flows through the reducer such that particles...Ch. 3 - A fluid has velocity components of u=(116x2yt)...Ch. 3 - A fluid flow is defined by u = (6x2 − 3y2) m/s and...Ch. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - A fluid flow is defined by u = (4xy) ft/s and υ =...Ch. 3 - Oil flows through the reducer such that particles...Ch. 3 - A fluid flow is defined by u=(14y2)m/s and...Ch. 3 - Prob. 33PCh. 3 - A fluid flow is defined by u = (0.5y) m/s and υ =...Ch. 3 - A velocity field for oil is defined by u = (3y)...Ch. 3 - The velocity for the flow of a gas along the...Ch. 3 - Prob. 37PCh. 3 - Air flowing through the center of the duct...Ch. 3 - A fluid flow is defined by u = (8t2) m/s and υ =...Ch. 3 - A fluid flow is defined by V = {4xi + 2j} m/s,...Ch. 3 - A fluid flow is defined by u = (2x2 − y2) m/s and...Ch. 3 - A fluid flow is defined by u = (2y2) m/s and υ =...Ch. 3 - The velocity of gasoline, along the centerline of...Ch. 3 - Prob. 44PCh. 3 - A fluid flow is defined by V = {4yi + 2xj} m/s,...Ch. 3 - Prob. 46PCh. 3 - Prob. 47PCh. 3 - As water flows steadily over the spillway, one of...Ch. 3 - Water flows into the drainpipe such that it only...Ch. 3 - The motion of a tornado can, in part, be described...Ch. 3 - A particle located at a point within a fluid flow...Ch. 3 - A particle moves along the circular streamline,...Ch. 3 - Air flows around the front circular surface. If...Ch. 3 - Fluid particles have velocity components of u =...Ch. 3 - A fluid has velocity components of u = (4xy) m/s...
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