Heat and Mass Transfer: Fundamentals & Applications Fourth Edition (First Printing)

Yunus A. Cengel & Afshin J. Ghajar McGraw-Hill, 2011

Errata Sheet

Last Update: December 13, 2011

Conversion Factors (Inside Front Cover)

Thermal resistance: Change “1 K/W = 0.52750 ºF/hBtu” to “1 K/W = 0.52750 ºFh/Btu”

Chapter 1

p. 9, 6th line after the subtitle: Change “denoted by W ” to “denoted by W ”

p. 11, 4th line: Change “ ” to “ ”. avgq avgq

p. 13, the term “m

” on the right of Eq. (1-17) should be even with the equal sign

p. 22, Table 1-2, last row: Change “CU” to “Cu”

p. 49, Prob. 1-29, Answers: Change Answers to “0.0306 m3/s, 5.52 m/s”.

p. 53, Prob. 1-86E, 3rd line: Change “ ” to “ ”

p. 57, Prob. 1-120, last line: Change “windchill” to “wind chill”

p. 58, Prob. 1-129, 6th line: Change “ = 3 mm” to “ = 3 mm”

p. 59, Prob. 1-147, 3rd line: Change “1.2 W” to “0.12 W”

Chapter 2

p. 100, Eq. 2-66: Vee should be volume vee “V ”

p. 116, Prob. 2-19E, 1st line: Change “a 800-W” to “an 800-W”

p. 121, Prob. 2-61, Answer: Change “7079 W” to “7389 W”

p. 121, Prob. 2-64, Answer: Change “127C” to “117C”

p. 122, Prob. 2-70E, 6th line: Change “1.25” to “12.5”

p. 122, Prob. 2-70E, Answer: Change “46,660 Btu/h” to “46,630 Btu/h”

p. 124, Prob. 2-88, 2nd line: Change “ k’’ ” to “k “

p. 125, Prob. 2-90, 5th line: Change “w/cm3” to “W/cm3”

p.127, Prob. 2-128,6th line: Change “at” after decrease to “in” and delete “surface” after ball bearing. The sentence should read “temperature decrease in the ball bearing at a given…”

p. 127, Prob. 2-128, Answer: Change “12.9 kW” to “1.62 kW”

p. 129, Prob. 2-142, Answers: Change Answers to “255.6C, 256.2C”

p. 130, Prob. 2-144, Answer: Change “9.0C” to “9.1C”

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Chapter 3

p. 161, 15th line below Eq. (3-50): change “0.05 W/m2K” to “0.05 W/mK”.

p. 168, line above Eq. (3-72), after corrected fin length, remove “(“

p. 171, Table 3-4, 1st line, last two columns: Change ““ to “” in two places

p. 174, 5th line after Eq. (3-83): Change “L=L=5

1m” to “L = 5/m”

p. 197, Prob. 3-20, Answers: Change Answers to “154 W, 16.7C”

p. 200, Prob. 3-37, 7th line: Change “28C” to “24C”. Do the same in the figure. [This is needed to avoid negative value for the insulation thickness]

p. 208, Prob. 3-112: Delete Fig. P3-112

p. 211, Prob. 3-131: Place a computer-EES icon “ ” to this problem.

p. 211, Prob. 3-135, Answer: Change “555 W” to “492 W”

p. 221, Prob. 3-216, Last line: Change “(d) 3.4 cm” to “3.3 cm”

Chapter 4

p. 231, Example 4-2: Replace the calculations with the followings. Only change the “changed” values

m 0125.04

m 050.0

4

)4/( 2

D

DL

LD

AL

sc

V

1.0088.0K W/m9.63

)m 0125.0)(K W/m450( 2

k

hLBi c

13

2

s 01059.0)m 0125.0)(KJ/kg 434)(kg/m 7832(

K W/m450 -

cpp

s

Lρc

h

c

hAb

V

bt

i

eTT

TtT

)(

→ s 254

40850

4095ln

s 01059.0

1)(ln

11-

i TT

TtT

bt

p.237, Table 4-1, last column for Plane wall: Change “ln tan ln 5 Bi” to “n tan n = Bi”

p. 239, Table 4-3, the last four Bessel function values in the last column should be positive, as shown below:

2.6 −0.0968 0.4708 2.8 −0.1850 0.4097 3.0 −0.2601 0.3391 3.2 −0.3202 0.2613

p. 253, Figure 4-29(c), top curve: Change “Time, t = 0.01 h” to “Time, t = 10 h”

p. 257, Figure 4-36: move the Plane Wall up, it should only cover the pink portion of the Long Cylinder

p.278, Prob. 4-12: Replace problem statement with “To warm up some milk for a baby, a mother pours milk into a thin-walled cylindrical container whose diameter is 6 cm. The height of the milk in the container is 7 cm. She then places the container into a large pan filled with hot water at 70°C. The milk is stirred constantly, so that its temperature is uniform at all times. If the heat

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transfer coefficient between the water and the container is 120 W/m2·K, determine how long it will take for the milk to warm up from 3°C to 38°C. Assume the entire surface area of the cylindrical container (including the top and bottom) is in thermal contact with the hot water. Take the properties of the milk to be the same as those of water. Can the milk in this case be treated as a lumped system? Why? Answer: 4.50 min"

p. 279, Prob. 4-24, 1st line: Change “is” to “in”

p. 279, Prob. 4-26, last line: Change “h.” to “h”

p. 281, Prob. 4-47, Answers: Change “22,270 kJ/m” to “22,270 kJ”

Chapter 5

p. 309, Fig. 5-20 (lower part –volume element of a general interior node of the fin): Change the right hand side length from “L – (m – ½)x” to from “L – (m + ½)x”

p. 353, Prob. 5-25: Change the problem statement to: “5-25 Repeat Prob. 5-24 using EES (or other) software.”

p. 358, Prob. 5-55, last line: Change to “Answers: (b) T1 = T4 = 93C, T2 = T3 = 86C”

p. 359, Prob. 5-60: Change the problem statement to: “5-60 Repeat Prob. 5-59 using EES (or other) software.”

p. 359, Prob. 5-63: Change the problem statement to: “5-63 Repeat Prob. 5-62 using EES (or other) software.”

p. 359, Prob. 5-64, 2nd line: Change “Fig. 5-64” to “Fig. P5-64”

p. 369, Prob. 5-136, 17th line: Change “28C” to “20C”. Do the same in the problem figure. Also, 3rd line from last: Change “t = 4 s” to “t = 5 s”. p. 369, Prob. 5-137, 2nd line: Change “3 s” to “5 s”

Chapter 6

p. 385, Eq. 6-13: Change “Viscous” to “Viscous forces”

p. 409, Figure P6-10: Change bottom plate label from “Ts,1” to “Ts,2”

p. 410, Prob. 6-28: 5th line: Change “A and B” to “C1 and C2”

p. 411, Figure P6-45: Change “Air” to “Water”

Chapter 7

p. 439, Figure 7-25: Change the figure caption to “Flow patterns for in-line and staggered tube banks”

p. 461, Prob. 7-127, (c): Change “2.5 m” to “2.9 m”

Chapter 8

p. 467, Top right hand side of the page, below page number: Change “Chapter 3” to “Chapter 8”.

p. 472, Eq. 8-14: Leave more space between the equation and the unit like that in Eq. 8-15.

pp. 501-506, The background color for Special Topic section disappears in these pages. Use a consistent background color in the entire Special Topic section.

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p. 505, Reference 5, last line: Delete “,” after No. 8

p. 511, Prob. 8-48, Answers: Change “584” to “582”

p. 513, Prob. 8-78: Change problem number to “8-78E”

p. 516, Prob. 8-99, 4th line: Delete “at” after enters

p. 516, Prob. 8-103: Change problem number to “8-103E”

Chapter 9

p. 541, Eq. 9-55: Change “0.46” to “0.046”

p. 550, 13th line from top of the page: Change “transfort” to “transport”

p. 552, section heading: Change “SCPECIAL” to “SPECIAL”

p. 565, Prob. 9-13: Change problem number to “9-13E”

p. 567, Prob. 9-37, 8th line: Change “the transfer” to “the heat transfer”

p. 568, Prob. 9-39, the line before last: Change “10-h” to “15-h”

p. 572, Prob. 9-78: Insert a laptop-EES icon to this problem like that in Prob. 9-75.

p. 573, Prob. 9-86, Answer: Change “11.9” to “9.90”

p. 575, Prob. 9-112, Answers: Change “1764” to “1762”

p. 579, Prob. 9-137, First line: Change “0.5-m-high” to “0.9-m-high”

Chapter 10

p. 599, 4th line after Eq. 10-8: Change “Ac = p” to “Ac = p”

p. 600, 6th line from the bottom of the page: Change “450< Re < 1800” to “30< Re < 1800”

p. 601, 3rd line above Eq. 10-12: Change in the numerator of the equation “(ρ y)” to “( y)”

p.603, 3rd line above Eq. 10-22: Change Eq. 10-9” to “Eq. 10-9a”

p. 606, 1st line: Delete “is higher”

p. 611, 5th line from top of the page: Change “Rohsenow” to “Rohsenow (1973)”

p. 611, Eq. 10-36: Change “22ºC < Tsat, 100ºC” to “22ºC < Tsat < 100ºC”

p. 613, Caption for Figure 10-37: Delete “upward” from the figure caption

p. 613, 6th line below Eq. 10-38: Change “ ” to “l I ”

p.613, 7th line below Eq. 10-38 in the denominator of equation for Fp, the closing parenthesis after “g” is missing: change the denominator to gD(l - g)

p. 615, 1st calculation: Leave a space before the second “kg/s”

p. 617, 15th line of the right hand side column, in the denominator of equation for hvert: change “(Ts - Tsat)” to “(Tsat - Ts)”

p. 617, last line of the right hand side column, in the denominator of equation for hhoriz: change “(Ts - Tsat)” to “(Tsat - Ts)”

p. 618, Equation for hinternal: In the denominator, insert a “D” into the denominator in the brackets after “(Tsat - Ts)”

p. 621, Prob. 10-38, Answers: Change “1609” to “1610” and Change “0.761” to “0.762”

p. 621, Prob. 10-39: Change “160C” to “155C”

p. 623, Prob. 10-69, Answer: Change “12.8” to “12.9”

p. 625, Prob. 10-98, Answers: Change “3345” to “8413” and “0.0242” to “0.0608”

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Chapter 11

p.654, 2nd equation below Eq. 11-33 for “if Ch = Cmin”: Change in,in,

out,out,

ch

hh

TT

TT

to in,in,

out,in,

ch

hh

TT

TT

p.655, 1st line below Eq. 11-38: Change “ratio” to “rate”

p.660, Example 11-8, 4th line: Change “1.08 m” to “108 m”

p.669, Prob. 11-43, 8th line: Change “cp = 2428 kJ/kg·K” to “cp = 2428 J/kg·K”

p.672, Figure P11-70: Change the direction of the two black arrows from “left to right” to “right to left”

p. 676, Prob. 11-117: Change to “11-117C”

p. 677, Prob. 11-129, Answers: Change “50.6” to “48.0”

p. 678, Prob. 11-132, Answer: Change “3.27” to “3.74”

p.680, Prob. 11-156, (c): Change “1380” to “1350”

Chapter 12

p. 696, Eq. 12-15: Change the color of black integrals to “orange”

p. 723, Prob. 12-28, Answers: Change Answers to “(a) 491,300 kW, (b) 125.5 kW”

p.724, Prob. 12-44, 3rd line: Change “2.87 10-5” to “2.87 105”

p.724, Figure P12-44: Change “Eb =2.87 10-5” to “Eb =2.87 105”

p. 724, Prob. 12-51, Answers: Change Answers to “ 0.513, 29.1 kW/m2 ”

p. 727, Prob. 12-82, Answers: Change “$39” to “$40”

p. 729, Prob. 12-103, 6th line: Change “200” to “2000”

Chapter 13

p.748, 5th line above Eq. 13-21: Change “I” to “ρi”

p.770, 3rd line: Change “(Figs. 12-36 and 12-37)” to “(Figs. 13-36 and 13-37)”

p. 781, Prob. 13-21: Change “L = D” to “L = D”

p. 785, Prob. 13-58: Delete the answer.

p. 786, Prob. 13-73, 1st line: Change “0.20” to “0.10” (This is needed because shield has a diameter of 0.20 m)

p. 790, Prob. 13-110, Answers: Change “5.2” to “12.7”

p. 790, Prob. 13-111, Answer: Change “1066” to “1058”

Chapter 14

p. 802, Eq. 14-13 for Mass basis: Change “dx

drA ” to “dx

d A ”

p. 802, Eq. 14-14: Change “” to “”

p. 808, Example 14-2, 7th line: Change “62,900 bar” to “62,000 bar”

p. 810, 1st equation in the analysis portion of Example 14-4: Change “ ” to “ ”

p. 811, 5th line above Eq. (14-21): Change “ ” to “ ” Amdiff ,

Adiffm ,

p. 822, 7th line before Eq. 14-40: Change “molecularmass” to “molecular mass”

p. 822, 6th line before Eq. 14-40: Change “themass” to “the mass”

5

p. 833, Expression below Figure 14-44: Change “ )( ,,

0

AsAmass

y

AAB wwh

y

CD ” to

“ )( ,,

0

AsAmass

y

AAB wwh

y

wD ”

p. 835, Eq. 14-82: Change “ )( ,,

0

,

AsAmass

y

AABsA wwh

y

wDj ” to

“ )( ,,

0

,

AsAmass

y

AABsA wwh

y

wDj ”

p. 848, 2nd Column, 4th line: Change “Le = 1” to “Le2/3 1”

p. 849, Prob. 14-14, Answer: Change “0.144” to “0.143”

p. 849, Prob. 14-16E, Answer: Change “1.7 percent” to “1.6 percent”

p. 852, Prob. 14-50, Answer: Change “2.8710−15 kg/s” to “1.1510−14 kg/s”

p. 854, Prob. 14-71, Answer: Change “0.00011 mm” to “0.0011 mm”. p. 856, Prob. 14-95, Answer: Change “2827 days” to “1702 days”

p. 861, Prob. 14-157E, Answers: Switch the answers for parts (a) and (b).

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