An air pipe carries cool air at an inlet bulk temperature of 15C and a velocity of 12 m/s. The pipe is made of carbon steel of 0.25 m diameter, it is not insulated, and it( the pipe) will be maintained at temperature of 120C in order to raise the flowing air temperature to 45C. Calculate the Reynolds number, the heat transfer coefficient in W/(m^2K) and the lenght of this pipe in meters. Use Table A.4 to read the air properties.
An air pipe carries cool air at an inlet bulk temperature of 15C and a velocity of 12 m/s. The pipe is made of carbon steel of 0.25 m diameter, it is not insulated, and it( the pipe) will be maintained at temperature of 120C in order to raise the flowing air temperature to 45C. Calculate the Reynolds number, the heat transfer coefficient in W/(m^2K) and the lenght of this pipe in meters. Use Table A.4 to read the air properties.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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An air pipe carries cool air at an inlet bulk temperature of 15C and a velocity of 12 m/s. The pipe is made of carbon steel of 0.25 m diameter, it is not insulated, and it( the pipe) will be maintained at temperature of 120C in order to raise the flowing air temperature to 45C. Calculate the Reynolds number, the heat transfer coefficient in W/(m^2K) and the lenght of this pipe in meters. Use Table A.4 to read the air properties.
![TABLE A.4
Properties of Dry Air at Atmospheric Pressure: SI Units
T
e (kg/m) Bx 10³ (1/K) C, (J/kg · K) k (W/m - K) a x 10° (m²/s) u x 10° (N · s/m²) v x 10° (m²/s) Pr
gBlv? x 108 (1/K · m³)
(К)
(°C)
273
1.252
3.66
1011
0.0237
19.2
17.456
13.9
0.71 1.85
293
20
1.164
3.41
1012
0.0251
22.0
18.240
15.7
0.71 1.36
313
40
1.092
3.19
1014
0.0265
24.8
19.123
17.6
0.71 1.01
333
60
1.025
3.00
1017
0.0279
27.6
19.907
19.4
0.71 0.782
353
80
0.968
2.83
1019
0.0293
30.6
20.790
21.5
0.71 0.600
373
100
0.916
2.68
1022
0.0307
33.6
21.673
23.6
0.71 0.472
473
200
0.723
2.11
1035
0.0370
49.7
25.693
35.5
0.71 0.164
573
300
0.596
1.75
1047
0.0429
68.9
39.322
49.2
0.71 0.0709
673
400
0.508
1.49
1059
0.0485
89.4
32.754
64.6
0.72 0.0350
773
500
0.442
1.29
1076
0.0540
113.2
35.794
81.0
0.72 0.0193
1273 1000| 0.268
0.79
1139
0.0762
240
48.445
181
0.74 0.00236
Source: Refs. [1] and [3].](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F965f2633-6838-4c2d-b94e-32b85de15479%2Feed3197c-27fa-40bd-a20b-ca74e3ebc87d%2F3l87slj_processed.png&w=3840&q=75)
Transcribed Image Text:TABLE A.4
Properties of Dry Air at Atmospheric Pressure: SI Units
T
e (kg/m) Bx 10³ (1/K) C, (J/kg · K) k (W/m - K) a x 10° (m²/s) u x 10° (N · s/m²) v x 10° (m²/s) Pr
gBlv? x 108 (1/K · m³)
(К)
(°C)
273
1.252
3.66
1011
0.0237
19.2
17.456
13.9
0.71 1.85
293
20
1.164
3.41
1012
0.0251
22.0
18.240
15.7
0.71 1.36
313
40
1.092
3.19
1014
0.0265
24.8
19.123
17.6
0.71 1.01
333
60
1.025
3.00
1017
0.0279
27.6
19.907
19.4
0.71 0.782
353
80
0.968
2.83
1019
0.0293
30.6
20.790
21.5
0.71 0.600
373
100
0.916
2.68
1022
0.0307
33.6
21.673
23.6
0.71 0.472
473
200
0.723
2.11
1035
0.0370
49.7
25.693
35.5
0.71 0.164
573
300
0.596
1.75
1047
0.0429
68.9
39.322
49.2
0.71 0.0709
673
400
0.508
1.49
1059
0.0485
89.4
32.754
64.6
0.72 0.0350
773
500
0.442
1.29
1076
0.0540
113.2
35.794
81.0
0.72 0.0193
1273 1000| 0.268
0.79
1139
0.0762
240
48.445
181
0.74 0.00236
Source: Refs. [1] and [3].
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