person extends his uncovered arms into the windy air outside at 54°F and 30 mph in order to feel nature closely as shown in the ure. Initially, the skin temperature of the arm is 84°F. Treating the arm as a 2-ft-long and 3-in-diameter cylinder, determine the rate of at loss from the arm. It is given that the properties of air at 1 atm and the film temperature of 69°F are (Table A-15E) k = 0.01455 u/h-ft.°F, v = 0.1638 × 10¬3 ft2/s, and Pr = 0.7308.

Elements Of Electromagnetics
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A person extends his uncovered arms into the windy air outside at 54°F and 30 mph in order to feel nature closely as shown in the
figure. Initially, the skin temperature of the arm is 84°F. Treating the arm as a 2-ft-long and 3-in-diameter cylinder, determine the rate of
heat loss from the arm. It is given that the properties of air at 1 atm and the film temperature of 69°F are (Table A-15E) k = 0.01455
Btu/h-ft.°F, v = 0.1638 × 10¬3 ft2/s, and Pr = 0.7308.
Air
54°F, Vmph
-84°F
The rate of heat loss from the arm is
Btu/h.
Transcribed Image Text:A person extends his uncovered arms into the windy air outside at 54°F and 30 mph in order to feel nature closely as shown in the figure. Initially, the skin temperature of the arm is 84°F. Treating the arm as a 2-ft-long and 3-in-diameter cylinder, determine the rate of heat loss from the arm. It is given that the properties of air at 1 atm and the film temperature of 69°F are (Table A-15E) k = 0.01455 Btu/h-ft.°F, v = 0.1638 × 10¬3 ft2/s, and Pr = 0.7308. Air 54°F, Vmph -84°F The rate of heat loss from the arm is Btu/h.
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