Answered: Checked whether the lumped system…

Checked whether the lumped system analysis is suitable OIf it is suitable, determine the temperature of the copper block at t=5,10 and 20 min after the immersion

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

i+ %33 0 13:32
HEAT TRANSFER HW3_2020 - Kaydedildi
Note you can check these equation from the text boks as well.
w m md w
HW6
A solid copper sphere of 10 cm diameter [ p=8954 kg/m³, C,=383 J/(kg K), k=386 W/(mK)]
initially at a uniform temperature Ti=250 C, is suddenly immersed in a well stirred fluid
which is maintained at a uniform temperature Tinf-50 C. The heat transfer coefficient between
the sphere and the fluid is h=200 W/(m²K)
ww
a) Checked whether the lumped system analysis is suitable
b) If it is suitable, determine the temperature of the copper block at t=5,10 and 20 min after the
immersion
wmw m
w w ww
HW7
0.1 m thick brick Wall [a=0.5x10-6 m²/s, k=0.69 W/(mK) and p=2300 kg/m³] is initially at T-230 C.
The wall is suddenly exposed to a convective environment at Tinf-30 C with a heat transfer
coefficient h=60 W/(m²K). By using serial solution determine
a) The center temperature at 1/2 , 2 and 4 h after exposure to the cooler environment
b) The surface temperature at ½ and 2 h
c) Energy removed from the plate per square meter during 1/h hour

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