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Air at 27◦C and 1 atm flows over a flat plate at a speed of 2 m/s. Assume that the plate is heated over its entire length to a temperature of 60◦C. Calculate the heat transferred in (a) the first 20 cm of the plate and (b) the first 40 cm of the plate.

Air at 27◦C and 1 atm flows over a flat plate at a speed of 2 m/s. Assume that the plate is heated over its entire length to a temperature of 60◦C. Calculate the heat transferred in (a) the first 20 cm of the plate and (b) the first 40 cm of the plate.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Example 3: Air at 27◦C and 1 atm flows over a flat plate at a speed of 2 m/s. Assume that the plate is heated over its entire length to a temperature of 60◦C. Calculate the heat transferred in (a) the first 20 cm of the plate and (b) the first 40 cm of the plate.
Example 3: Air at 27°C and 1 atm flows over a flat plate at a speed of 2 m/s. Assume that the plate is heated over its entire length to a temperature of 60•C. Calculate the heat transferred in (a) the first 20 cm of the plate and (b) the first 40 cm of the plate. Lec. (6) Heat Transfer Dr. Omar M. Ali Solution The total heat transfer over a certain length of the plate is desired; so we wish to calculate average heat-transfer coefficients. For this purpose we use Equations (5-44) and (5-45), evaluating the properties at the film temperature: 27+60 Tf = 43.5°C=316.5 K [110.3°F] From Appendix A the properties are v=17.36 × 10-6 m²/s [1.87 × 10¬4 ft²/s] k=0.02749 W/m - °C [0.0159 Btu/h - ft - °F] Pr =0.7 Cp=1.006 kJ/kg - °C [0.24 Btu/lbm - °F]
Transcribed Image Text:Example 3: Air at 27°C and 1 atm flows over a flat plate at a speed of 2 m/s. Assume that the plate is heated over its entire length to a temperature of 60•C. Calculate the heat transferred in (a) the first 20 cm of the plate and (b) the first 40 cm of the plate. Lec. (6) Heat Transfer Dr. Omar M. Ali Solution The total heat transfer over a certain length of the plate is desired; so we wish to calculate average heat-transfer coefficients. For this purpose we use Equations (5-44) and (5-45), evaluating the properties at the film temperature: 27+60 Tf = 43.5°C=316.5 K [110.3°F] From Appendix A the properties are v=17.36 × 10-6 m²/s [1.87 × 10¬4 ft²/s] k=0.02749 W/m - °C [0.0159 Btu/h - ft - °F] Pr =0.7 Cp=1.006 kJ/kg - °C [0.24 Btu/lbm - °F]
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