Engenharia - transferência de calor

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SOLUTION MANUAL ENGLISH UNIT PROBLEMS CHAPTER 3

SONNTAG • BORGNAKKE • VAN WYLEN

FUNDAMENTALS

of
Thermodynamics
Sixth Edition

Sonntag, Borgnakke and van Wylen

CONTENT CHAPTER 3
SUBSECTION Correspondence table Study guide problems Phase diagrams, triple and critical points General tables Ideal gas Compressibility factor Review problems Linear interpolation Computer tables Englishunit problems PROB NO. 1-20 21-28 29-63 64-79 79-89 90-115 116-121 122-127 128-158

Sonntag, Borgnakke and van Wylen

Correspondence Table CHAPTER 3 6th edition

Sonntag/Borgnakke/Wylen

The set of problems have a correspondence to the 5th edition Fundamentals of Thermodynamics as: Problems 3.1 through 3.20 are all new New 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 4243 44 45 46 47 48 49 50 51 52 53 54 55 56 5th new 2 1 3 new 4 28 mod new 23 28 mod 24 new new new 29 new new 27 mod new 37 41 new new new new 36 new 58 35 42 new 43 new 40 44 New 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 5th 46 48 39 mod 57 51 new new 5 new 22 6 new 8 new 10 13 new 25 new new new 17 14 19 33 new new new new 20 new21 18 26 mod 16 mod 30 mod New 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 5th 30 mod 31 mod 32 new 60 55 new 59 53 54 50 49 45 56 9 52 7 47 11 12 16 38 34 new new new new new new new new new new 86 87

Sonntag, Borgnakke and van Wylen

The English unit problem correspondence is New 128 129 130 131 132133 134 135 136 137 138 139 140 141 142 5th Ed. new new new new new new 61E 68E a-c 68E d-f new 70E 73E 74E new 76E SI 5 7 9 11 17 23 27 30 30 40 36 47 41 44 51 New 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 5th Ed. 77E new 79E 62E new 69E c+d 70E d 72E 64E new 81E new 71E 80E 83E 65E 66E SI 53 62 58 69 65 81 113 74 49 99 95 61 106 89 -

The Computer, design and open-endedproblem correspondence is New 159 160 161 162 5th new new 88 89 New 163 164 165 166 5th 90 91 92 93 New 167 168 5th 94 95

mod indicates a modification from the previous problem that changes the solution but otherwise is the same type problem.

Sonntag, Borgnakke and van Wylen

Concept-Study Guide Problems

Sonntag, Borgnakke and van Wylen

3.1 What is the lowest temperature(approximately) at which water can be liquid? ln P Look at the phase diagram in Fig. 3.7. At the border between ice I, ice III and the liquid region is a triple point which is the lowest T where you can have liquid. From the figure it is estimated to be about 255 K i.e. at -18oC. T ≈ 255 K ≈ - 18°C 3.2 What is the percent change in volume as liquid water freezes? Mention some effects in nature and for ourhouseholds the volume change can have. The density of water in the different phases can be found in Tables A.3 and A.4 and in Table B.1. From Table B.1.1 vf = 0.00100 m3/kg From Table B.1.5 Percent change: 100 vi = 0.0010908 m3/kg vi – vf 0.0010908 – 0.001 = 100 × = 9.1 % increase 0.001 vf
lowest T liquid

L S V

CR.P.

T

Liquid water that seeps into cracks or other confined spaces and thenfreezes will expand and widen the cracks. This is what destroys any pourous material exposed to the weather on buildings, roads and mountains. 3.3 When you skate on ice a thin liquid film forms under the skate; how can that be? The ice is at some temperature below the freezing temperature for the atmospheric pressure of 100 kPa = 0.1 MPa and thus to the left of the fusion line in the solid ice Iregion of Fig. 3.7. As the skate comes over the ice the pressure is increased dramatically right under the blade so it brings the state straight up in the diagram crossing the fusion line and brings it into a liquid state at same temperature. The very thin liquid film under the skate changes the friction to be viscous rather than a solid to solid contact friction. Friction is thus significantly...
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