3. The following data is related to a short brass cylinder of diameter D = 10 cm and height H = 20 cm is initially at a uniform temperature of Ti = 200°C. The cylinder is now placed in atmospheric air at 25°C, where heat transfer takes place by convection with a heat transfer coefficient of h = 60 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.
3. The following data is related to a short brass cylinder of diameter D = 10 cm and height H = 20 cm is initially at a uniform temperature of Ti = 200°C. The cylinder is now placed in atmospheric air at 25°C, where heat transfer takes place by convection with a heat transfer coefficient of h = 60 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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Transcribed Image Text:3. The following data is related to a short brass cylinder of diameter D =
10 cm and height H= 20 cm is initially at a uniform temperature of Ti
= 200°C. The cylinder is now placed in atmospheric air at 25°C, where
heat transfer takes place by convection with a heat transfer
coefficient of h = 60 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.
Properties The themal properties of brass are given to be p= $530 kg/m²,C, = 0.389kJkg-°C,
k=110 Wm -°C , and a= 3.39 ×10° m² /s.
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