Answered: Calculate the free convection heat…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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2. Calculate the free convection heat transfer coefficient for a plate 6 ft high and 8 ft wide at 120 °F that is exposed to nitrogen at 60 °F. (see attached) 3. Constant Flux Application. Air at 1 atm and 300 °C is cooled as it flows at a velocity of 5.0 m/s through a tube with a diameter of 2.54 cm. Calculate the heat transfer coefficient if a constant heat flux condition is maintained at the wall and the wall temperature is 20 °C above the temperature along the entire length of the tube. (See attached)

p=0.0713lb/ft v=16.82x10 ft/s
k=0.01514 Btu/hr ft- °F
2.
Pr = 0.713
B = 1/T = 1/550 = 1.818x10- R-
Ra = (Gr)(Pr) = (2.682x10")(0.713)= 1.912x10"
3. Assuming air to have the properties of nitrogen:
c, =1.041kJ/kg -K
Pr = 0.713
µ=1.784x10* kg/m-s
k= 0.0262W/m · K

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