A short brass cylinder (8530 kg/m3,Cp = 0.389 kJ/kg · °C, k =110 W/m · °C, and α= 3.39 x 10-5 m2/s) of diameter D =8 cm and height H = 15 cm is initially at a uniform temperature of Ti= 150°C. The cylinder is now placed in atmospheric air at 20°C, where heat transfer takes place by convection with a heat transfer coefficient of h =40 W/m2 · °C. Calculate (a) the center temperature of the cylinder, b) the center temperature of the top surface of the cylinder and (c) the total heat transfer from the cylinder 15 min after the start of the cooling
A short brass cylinder (8530 kg/m3,Cp = 0.389 kJ/kg · °C, k =110 W/m · °C, and α= 3.39 x 10-5 m2/s) of diameter D =8 cm and height H = 15 cm is initially at a uniform temperature of Ti= 150°C. The cylinder is now placed in atmospheric air at 20°C, where heat transfer takes place by convection with a heat transfer coefficient of h =40 W/m2 · °C. Calculate (a) the center temperature of the cylinder, b) the center temperature of the top surface of the cylinder and (c) the total heat transfer from the cylinder 15 min after the start of the cooling
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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A short brass cylinder (8530 kg/m3,Cp = 0.389 kJ/kg · °C, k =110 W/m · °C, and
α= 3.39 x 10-5 m2/s) of diameter D =8 cm and height H = 15 cm is initially at a uniform temperature of Ti= 150°C. The cylinder is now placed in atmospheric air at 20°C, where heat transfer takes place by convection with a heat transfer coefficient of h =40 W/m2 · °C. Calculate (a) the center temperature of the cylinder, b) the center temperature of the top surface of the cylinder and (c) the total heat transfer from the cylinder 15 min after the start of the cooling. Answer: a) 85.1 ℃, b) 84.2℃, c) 164 kJ
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