à heat transfer takes place by convection _with ficient of h = 60 W/m2 · °C. Calculate (a) the center temperature e cylinder, (b) the center temperature of the top surface of the der, and (c) the total heat transfer from the cylinder 15 min after start of the cooling. transfer %3D le themal properies of brass are given to be p=8530 kg/ m²,C, =0.389kJkg-°C, -°C, and a= 3,39 × 10° m² /s.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.32P
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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.
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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